[PATCH 4.14 00/51] 4.14.192-rc1 review

[PATCH 4.14 00/51] 4.14.192-rc1 review

[Greg Kroah-Hartman]

This is the start of the stable review cycle for the 4.14.192 release.
There are 51 patches in this series, all will be posted as a response
to this one.  If anyone has any issues with these being applied, please
let me know.

Responses should be made by Wed, 05 Aug 2020 12:18:33 +0000.
Anything received after that time might be too late.

The whole patch series can be found in one patch at:
	https://www.kernel.org/pub/linux/kernel/v4.x/stable-review/patch-4.14.192-rc1.gz
or in the git tree and branch at:
	git://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable-rc.git linux-4.14.y
and the diffstat can be found below.

thanks,

greg k-h

-------------
Pseudo-Shortlog of commits:

Greg Kroah-Hartman <gregkh@linuxfoundation.org>
    Linux 4.14.192-rc1

Thomas Gleixner <tglx@linutronix.de>
    x86/i8259: Use printk_deferred() to prevent deadlock

Wanpeng Li <wanpengli@tencent.com>
    KVM: LAPIC: Prevent setting the tscdeadline timer if the lapic is hw disabled

Andrea Righi <andrea.righi@canonical.com>
    xen-netfront: fix potential deadlock in xennet_remove()

Navid Emamdoost <navid.emamdoost@gmail.com>
    cxgb4: add missing release on skb in uld_send()

Josh Poimboeuf <jpoimboe@redhat.com>
    x86/unwind/orc: Fix ORC for newly forked tasks

Raviteja Narayanam <raviteja.narayanam@xilinx.com>
    Revert "i2c: cadence: Fix the hold bit setting"

Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
    net: ethernet: ravb: exit if re-initialization fails in tx timeout

Liam Beguin <liambeguin@gmail.com>
    parisc: add support for cmpxchg on u8 pointers

Navid Emamdoost <navid.emamdoost@gmail.com>
    nfc: s3fwrn5: add missing release on skb in s3fwrn5_recv_frame

Laurence Oberman <loberman@redhat.com>
    qed: Disable "MFW indication via attention" SPAM every 5 minutes

Geert Uytterhoeven <geert@linux-m68k.org>
    usb: hso: Fix debug compile warning on sparc32

Robin Murphy <robin.murphy@arm.com>
    arm64: csum: Fix handling of bad packets

Sami Tolvanen <samitolvanen@google.com>
    arm64/alternatives: move length validation inside the subsection

Remi Pommarel <repk@triplefau.lt>
    mac80211: mesh: Free pending skb when destroying a mpath

Remi Pommarel <repk@triplefau.lt>
    mac80211: mesh: Free ie data when leaving mesh

Andrii Nakryiko <andriin@fb.com>
    bpf: Fix map leak in HASH_OF_MAPS map

Thomas Falcon <tlfalcon@linux.ibm.com>
    ibmvnic: Fix IRQ mapping disposal in error path

Ido Schimmel <idosch@mellanox.com>
    mlxsw: core: Free EMAD transactions using kfree_rcu()

Ido Schimmel <idosch@mellanox.com>
    mlxsw: core: Increase scope of RCU read-side critical section

Jakub Kicinski <kuba@kernel.org>
    mlx4: disable device on shutdown

Johan Hovold <johan@kernel.org>
    net: lan78xx: fix transfer-buffer memory leak

Johan Hovold <johan@kernel.org>
    net: lan78xx: add missing endpoint sanity check

Michael Karcher <kernel@mkarcher.dialup.fu-berlin.de>
    sh: Fix validation of system call number

Tanner Love <tannerlove@google.com>
    selftests/net: rxtimestamp: fix clang issues for target arch PowerPC

YueHaibing <yuehaibing@huawei.com>
    net/x25: Fix null-ptr-deref in x25_disconnect

Xiyu Yang <xiyuyang19@fudan.edu.cn>
    net/x25: Fix x25_neigh refcnt leak when x25 disconnect

Rik van Riel <riel@surriel.com>
    xfs: fix missed wakeup on l_flush_wait

Peilin Ye <yepeilin.cs@gmail.com>
    rds: Prevent kernel-infoleak in rds_notify_queue_get()

Joerg Roedel <jroedel@suse.de>
    x86, vmlinux.lds: Page-align end of ..page_aligned sections

Sami Tolvanen <samitolvanen@google.com>
    x86/build/lto: Fix truncated .bss with -fdata-sections

Wang Hai <wanghai38@huawei.com>
    9p/trans_fd: Fix concurrency del of req_list in p9_fd_cancelled/p9_read_work

Dominique Martinet <dominique.martinet@cea.fr>
    9p/trans_fd: abort p9_read_work if req status changed

Linus Torvalds <torvalds@linux-foundation.org>
    random32: remove net_rand_state from the latent entropy gcc plugin

Willy Tarreau <w@1wt.eu>
    random: fix circular include dependency on arm64 after addition of percpu.h

Sheng Yong <shengyong1@huawei.com>
    f2fs: check if file namelen exceeds max value

Jaegeuk Kim <jaegeuk@kernel.org>
    f2fs: check memory boundary by insane namelen

Steve Cohen <cohens@codeaurora.org>
    drm: hold gem reference until object is no longer accessed

Peilin Ye <yepeilin.cs@gmail.com>
    drm/amdgpu: Prevent kernel-infoleak in amdgpu_info_ioctl()

Grygorii Strashko <grygorii.strashko@ti.com>
    ARM: percpu.h: fix build error

Willy Tarreau <w@1wt.eu>
    random32: update the net random state on interrupt and activity

Will Deacon <will@kernel.org>
    ARM: 8986/1: hw_breakpoint: Don't invoke overflow handler on uaccess watchpoints

Pi-Hsun Shih <pihsun@chromium.org>
    wireless: Use offsetof instead of custom macro.

Robert Hancock <hancockrwd@gmail.com>
    PCI/ASPM: Disable ASPM on ASMedia ASM1083/1085 PCIe-to-PCI bridge

Sasha Levin <sashal@kernel.org>
    x86/kvm: Be careful not to clear KVM_VCPU_FLUSH_TLB bit

Navid Emamdoost <navid.emamdoost@gmail.com>
    ath9k: release allocated buffer if timed out

Navid Emamdoost <navid.emamdoost@gmail.com>
    ath9k_htc: release allocated buffer if timed out

Sasha Levin <sashal@kernel.org>
    iio: imu: adis16400: fix memory leak

Navid Emamdoost <navid.emamdoost@gmail.com>
    media: rc: prevent memory leak in cx23888_ir_probe

Navid Emamdoost <navid.emamdoost@gmail.com>
    crypto: ccp - Release all allocated memory if sha type is invalid

Wei Yongjun <weiyongjun1@huawei.com>
    net: phy: mdio-bcm-unimac: fix potential NULL dereference in unimac_mdio_probe()

Jason Yan <yanaijie@huawei.com>
    scsi: libsas: direct call probe and destruct


-------------

Diffstat:

 Makefile                                           |  4 +-
 arch/arm/include/asm/percpu.h                      |  2 +
 arch/arm/kernel/hw_breakpoint.c                    | 27 +++++++--
 arch/arm64/include/asm/alternative.h               |  4 +-
 arch/arm64/include/asm/checksum.h                  |  5 +-
 arch/parisc/include/asm/cmpxchg.h                  |  2 +
 arch/parisc/lib/bitops.c                           | 12 ++++
 arch/sh/kernel/entry-common.S                      |  6 +-
 arch/x86/kernel/i8259.c                            |  2 +-
 arch/x86/kernel/unwind_orc.c                       |  8 ++-
 arch/x86/kernel/vmlinux.lds.S                      |  3 +-
 arch/x86/kvm/lapic.c                               |  2 +-
 arch/x86/kvm/x86.c                                 |  3 +
 drivers/char/random.c                              |  1 +
 drivers/crypto/ccp/ccp-ops.c                       |  3 +-
 drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c            |  3 +-
 drivers/gpu/drm/drm_gem.c                          | 10 ++--
 drivers/i2c/busses/i2c-cadence.c                   |  9 +--
 drivers/iio/imu/adis16400_buffer.c                 |  5 +-
 drivers/media/pci/cx23885/cx23888-ir.c             |  5 +-
 drivers/net/ethernet/chelsio/cxgb4/sge.c           |  1 +
 drivers/net/ethernet/ibm/ibmvnic.c                 |  2 +-
 drivers/net/ethernet/mellanox/mlx4/main.c          |  2 +
 drivers/net/ethernet/mellanox/mlxsw/core.c         |  8 ++-
 drivers/net/ethernet/qlogic/qed/qed_int.c          |  3 +-
 drivers/net/ethernet/renesas/ravb_main.c           | 26 ++++++++-
 drivers/net/phy/mdio-bcm-unimac.c                  |  2 +
 drivers/net/usb/hso.c                              |  5 +-
 drivers/net/usb/lan78xx.c                          |  6 ++
 drivers/net/wireless/ath/ath9k/htc_hst.c           |  3 +
 drivers/net/wireless/ath/ath9k/wmi.c               |  1 +
 drivers/net/xen-netfront.c                         | 64 ++++++++++++++--------
 drivers/nfc/s3fwrn5/core.c                         |  1 +
 drivers/pci/quirks.c                               | 13 +++++
 drivers/scsi/libsas/sas_ata.c                      |  1 -
 drivers/scsi/libsas/sas_discover.c                 | 32 ++++++-----
 drivers/scsi/libsas/sas_expander.c                 |  8 +--
 drivers/scsi/libsas/sas_internal.h                 |  1 +
 drivers/scsi/libsas/sas_port.c                     |  3 +
 fs/f2fs/dir.c                                      | 12 +++-
 fs/xfs/xfs_log.c                                   |  9 ++-
 include/asm-generic/vmlinux.lds.h                  |  5 +-
 include/linux/random.h                             |  3 +
 include/scsi/libsas.h                              |  3 +-
 include/scsi/scsi_transport_sas.h                  |  1 +
 include/uapi/linux/wireless.h                      |  5 +-
 kernel/bpf/hashtab.c                               | 12 +++-
 kernel/time/timer.c                                |  8 +++
 lib/random32.c                                     |  2 +-
 net/9p/trans_fd.c                                  | 32 ++++++++---
 net/mac80211/cfg.c                                 |  1 +
 net/mac80211/mesh_pathtbl.c                        |  1 +
 net/rds/recv.c                                     |  3 +-
 net/x25/x25_subr.c                                 |  6 ++
 .../networking/timestamping/rxtimestamp.c          |  3 +-
 55 files changed, 292 insertions(+), 112 deletions(-)

[PATCH 4.14 01/51] scsi: libsas: direct call probe and destruct

[Greg Kroah-Hartman]

From: Jason Yan <yanaijie@huawei.com>

[ Upstream commit 0558f33c06bb910e2879e355192227a8e8f0219d ]

In commit 87c8331fcf72 ("[SCSI] libsas: prevent domain rediscovery
competing with ata error handling") introduced disco mutex to prevent
rediscovery competing with ata error handling and put the whole
revalidation in the mutex. But the rphy add/remove needs to wait for the
error handling which also grabs the disco mutex. This may leads to dead
lock.So the probe and destruct event were introduce to do the rphy
add/remove asynchronously and out of the lock.

The asynchronously processed workers makes the whole discovery process
not atomic, the other events may interrupt the process. For example,
if a loss of signal event inserted before the probe event, the
sas_deform_port() is called and the port will be deleted.

And sas_port_delete() may run before the destruct event, but the
port-x:x is the top parent of end device or expander. This leads to
a kernel WARNING such as:

[   82.042979] sysfs group 'power' not found for kobject 'phy-1:0:22'
[   82.042983] ------------[ cut here ]------------
[   82.042986] WARNING: CPU: 54 PID: 1714 at fs/sysfs/group.c:237
sysfs_remove_group+0x94/0xa0
[   82.043059] Call trace:
[   82.043082] [<ffff0000082e7624>] sysfs_remove_group+0x94/0xa0
[   82.043085] [<ffff00000864e320>] dpm_sysfs_remove+0x60/0x70
[   82.043086] [<ffff00000863ee10>] device_del+0x138/0x308
[   82.043089] [<ffff00000869a2d0>] sas_phy_delete+0x38/0x60
[   82.043091] [<ffff00000869a86c>] do_sas_phy_delete+0x6c/0x80
[   82.043093] [<ffff00000863dc20>] device_for_each_child+0x58/0xa0
[   82.043095] [<ffff000008696f80>] sas_remove_children+0x40/0x50
[   82.043100] [<ffff00000869d1bc>] sas_destruct_devices+0x64/0xa0
[   82.043102] [<ffff0000080e93bc>] process_one_work+0x1fc/0x4b0
[   82.043104] [<ffff0000080e96c0>] worker_thread+0x50/0x490
[   82.043105] [<ffff0000080f0364>] kthread+0xfc/0x128
[   82.043107] [<ffff0000080836c0>] ret_from_fork+0x10/0x50

Make probe and destruct a direct call in the disco and revalidate function,
but put them outside the lock. The whole discovery or revalidate won't
be interrupted by other events. And the DISCE_PROBE and DISCE_DESTRUCT
event are deleted as a result of the direct call.

Introduce a new list to destruct the sas_port and put the port delete after
the destruct. This makes sure the right order of destroying the sysfs
kobject and fix the warning above.

In sas_ex_revalidate_domain() have a loop to find all broadcasted
device, and sometimes we have a chance to find the same expander twice.
Because the sas_port will be deleted at the end of the whole revalidate
process, sas_port with the same name cannot be added before this.
Otherwise the sysfs will complain of creating duplicate filename. Since
the LLDD will send broadcast for every device change, we can only
process one expander's revalidation.

[mkp: kbuild test robot warning]

Signed-off-by: Jason Yan <yanaijie@huawei.com>
CC: John Garry <john.garry@huawei.com>
CC: Johannes Thumshirn <jthumshirn@suse.de>
CC: Ewan Milne <emilne@redhat.com>
CC: Christoph Hellwig <hch@lst.de>
CC: Tomas Henzl <thenzl@redhat.com>
CC: Dan Williams <dan.j.williams@intel.com>
Reviewed-by: Hannes Reinecke <hare@suse.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/scsi/libsas/sas_ata.c      |  1 -
 drivers/scsi/libsas/sas_discover.c | 32 +++++++++++++++++-------------
 drivers/scsi/libsas/sas_expander.c |  8 +++-----
 drivers/scsi/libsas/sas_internal.h |  1 +
 drivers/scsi/libsas/sas_port.c     |  3 +++
 include/scsi/libsas.h              |  3 +--
 include/scsi/scsi_transport_sas.h  |  1 +
 7 files changed, 27 insertions(+), 22 deletions(-)

diff --git a/drivers/scsi/libsas/sas_ata.c b/drivers/scsi/libsas/sas_ata.c
index 70be4425ae0be..2b3637b40dde9 100644
--- a/drivers/scsi/libsas/sas_ata.c
+++ b/drivers/scsi/libsas/sas_ata.c
@@ -730,7 +730,6 @@ int sas_discover_sata(struct domain_device *dev)
 	if (res)
 		return res;
 
-	sas_discover_event(dev->port, DISCE_PROBE);
 	return 0;
 }
 
diff --git a/drivers/scsi/libsas/sas_discover.c b/drivers/scsi/libsas/sas_discover.c
index b200edc665a58..d6365e2fcc603 100644
--- a/drivers/scsi/libsas/sas_discover.c
+++ b/drivers/scsi/libsas/sas_discover.c
@@ -221,13 +221,9 @@ void sas_notify_lldd_dev_gone(struct domain_device *dev)
 	}
 }
 
-static void sas_probe_devices(struct work_struct *work)
+static void sas_probe_devices(struct asd_sas_port *port)
 {
 	struct domain_device *dev, *n;
-	struct sas_discovery_event *ev = to_sas_discovery_event(work);
-	struct asd_sas_port *port = ev->port;
-
-	clear_bit(DISCE_PROBE, &port->disc.pending);
 
 	/* devices must be domain members before link recovery and probe */
 	list_for_each_entry(dev, &port->disco_list, disco_list_node) {
@@ -303,7 +299,6 @@ int sas_discover_end_dev(struct domain_device *dev)
 	res = sas_notify_lldd_dev_found(dev);
 	if (res)
 		return res;
-	sas_discover_event(dev->port, DISCE_PROBE);
 
 	return 0;
 }
@@ -362,13 +357,9 @@ static void sas_unregister_common_dev(struct asd_sas_port *port, struct domain_d
 	sas_put_device(dev);
 }
 
-static void sas_destruct_devices(struct work_struct *work)
+void sas_destruct_devices(struct asd_sas_port *port)
 {
 	struct domain_device *dev, *n;
-	struct sas_discovery_event *ev = to_sas_discovery_event(work);
-	struct asd_sas_port *port = ev->port;
-
-	clear_bit(DISCE_DESTRUCT, &port->disc.pending);
 
 	list_for_each_entry_safe(dev, n, &port->destroy_list, disco_list_node) {
 		list_del_init(&dev->disco_list_node);
@@ -379,6 +370,16 @@ static void sas_destruct_devices(struct work_struct *work)
 	}
 }
 
+static void sas_destruct_ports(struct asd_sas_port *port)
+{
+	struct sas_port *sas_port, *p;
+
+	list_for_each_entry_safe(sas_port, p, &port->sas_port_del_list, del_list) {
+		list_del_init(&sas_port->del_list);
+		sas_port_delete(sas_port);
+	}
+}
+
 void sas_unregister_dev(struct asd_sas_port *port, struct domain_device *dev)
 {
 	if (!test_bit(SAS_DEV_DESTROY, &dev->state) &&
@@ -393,7 +394,6 @@ void sas_unregister_dev(struct asd_sas_port *port, struct domain_device *dev)
 	if (!test_and_set_bit(SAS_DEV_DESTROY, &dev->state)) {
 		sas_rphy_unlink(dev->rphy);
 		list_move_tail(&dev->disco_list_node, &port->destroy_list);
-		sas_discover_event(dev->port, DISCE_DESTRUCT);
 	}
 }
 
@@ -499,6 +499,8 @@ static void sas_discover_domain(struct work_struct *work)
 		port->port_dev = NULL;
 	}
 
+	sas_probe_devices(port);
+
 	SAS_DPRINTK("DONE DISCOVERY on port %d, pid:%d, result:%d\n", port->id,
 		    task_pid_nr(current), error);
 }
@@ -532,6 +534,10 @@ static void sas_revalidate_domain(struct work_struct *work)
 		    port->id, task_pid_nr(current), res);
  out:
 	mutex_unlock(&ha->disco_mutex);
+
+	sas_destruct_devices(port);
+	sas_destruct_ports(port);
+	sas_probe_devices(port);
 }
 
 /* ---------- Events ---------- */
@@ -587,10 +593,8 @@ void sas_init_disc(struct sas_discovery *disc, struct asd_sas_port *port)
 	static const work_func_t sas_event_fns[DISC_NUM_EVENTS] = {
 		[DISCE_DISCOVER_DOMAIN] = sas_discover_domain,
 		[DISCE_REVALIDATE_DOMAIN] = sas_revalidate_domain,
-		[DISCE_PROBE] = sas_probe_devices,
 		[DISCE_SUSPEND] = sas_suspend_devices,
 		[DISCE_RESUME] = sas_resume_devices,
-		[DISCE_DESTRUCT] = sas_destruct_devices,
 	};
 
 	disc->pending = 0;
diff --git a/drivers/scsi/libsas/sas_expander.c b/drivers/scsi/libsas/sas_expander.c
index f77d72f01da91..84df6cf467605 100644
--- a/drivers/scsi/libsas/sas_expander.c
+++ b/drivers/scsi/libsas/sas_expander.c
@@ -1946,7 +1946,8 @@ static void sas_unregister_devs_sas_addr(struct domain_device *parent,
 		sas_port_delete_phy(phy->port, phy->phy);
 		sas_device_set_phy(found, phy->port);
 		if (phy->port->num_phys == 0)
-			sas_port_delete(phy->port);
+			list_add_tail(&phy->port->del_list,
+				&parent->port->sas_port_del_list);
 		phy->port = NULL;
 	}
 }
@@ -2156,7 +2157,7 @@ int sas_ex_revalidate_domain(struct domain_device *port_dev)
 	struct domain_device *dev = NULL;
 
 	res = sas_find_bcast_dev(port_dev, &dev);
-	while (res == 0 && dev) {
+	if (res == 0 && dev) {
 		struct expander_device *ex = &dev->ex_dev;
 		int i = 0, phy_id;
 
@@ -2168,9 +2169,6 @@ int sas_ex_revalidate_domain(struct domain_device *port_dev)
 			res = sas_rediscover(dev, phy_id);
 			i = phy_id + 1;
 		} while (i < ex->num_phys);
-
-		dev = NULL;
-		res = sas_find_bcast_dev(port_dev, &dev);
 	}
 	return res;
 }
diff --git a/drivers/scsi/libsas/sas_internal.h b/drivers/scsi/libsas/sas_internal.h
index c07e081364915..f3449fde9c5fb 100644
--- a/drivers/scsi/libsas/sas_internal.h
+++ b/drivers/scsi/libsas/sas_internal.h
@@ -98,6 +98,7 @@ int sas_try_ata_reset(struct asd_sas_phy *phy);
 void sas_hae_reset(struct work_struct *work);
 
 void sas_free_device(struct kref *kref);
+void sas_destruct_devices(struct asd_sas_port *port);
 
 #ifdef CONFIG_SCSI_SAS_HOST_SMP
 extern void sas_smp_host_handler(struct bsg_job *job, struct Scsi_Host *shost);
diff --git a/drivers/scsi/libsas/sas_port.c b/drivers/scsi/libsas/sas_port.c
index d3c5297c6c89e..5d3244c8f2801 100644
--- a/drivers/scsi/libsas/sas_port.c
+++ b/drivers/scsi/libsas/sas_port.c
@@ -66,6 +66,7 @@ static void sas_resume_port(struct asd_sas_phy *phy)
 		rc = sas_notify_lldd_dev_found(dev);
 		if (rc) {
 			sas_unregister_dev(port, dev);
+			sas_destruct_devices(port);
 			continue;
 		}
 
@@ -219,6 +220,7 @@ void sas_deform_port(struct asd_sas_phy *phy, int gone)
 
 	if (port->num_phys == 1) {
 		sas_unregister_domain_devices(port, gone);
+		sas_destruct_devices(port);
 		sas_port_delete(port->port);
 		port->port = NULL;
 	} else {
@@ -323,6 +325,7 @@ static void sas_init_port(struct asd_sas_port *port,
 	INIT_LIST_HEAD(&port->dev_list);
 	INIT_LIST_HEAD(&port->disco_list);
 	INIT_LIST_HEAD(&port->destroy_list);
+	INIT_LIST_HEAD(&port->sas_port_del_list);
 	spin_lock_init(&port->phy_list_lock);
 	INIT_LIST_HEAD(&port->phy_list);
 	port->ha = sas_ha;
diff --git a/include/scsi/libsas.h b/include/scsi/libsas.h
index a966d281dedc3..1b1cf9eff3b5a 100644
--- a/include/scsi/libsas.h
+++ b/include/scsi/libsas.h
@@ -87,10 +87,8 @@ enum discover_event {
 	DISCE_DISCOVER_DOMAIN   = 0U,
 	DISCE_REVALIDATE_DOMAIN = 1,
 	DISCE_PORT_GONE         = 2,
-	DISCE_PROBE		= 3,
 	DISCE_SUSPEND		= 4,
 	DISCE_RESUME		= 5,
-	DISCE_DESTRUCT		= 6,
 	DISC_NUM_EVENTS		= 7,
 };
 
@@ -269,6 +267,7 @@ struct asd_sas_port {
 	struct list_head dev_list;
 	struct list_head disco_list;
 	struct list_head destroy_list;
+	struct list_head sas_port_del_list;
 	enum   sas_linkrate linkrate;
 
 	struct sas_work work;
diff --git a/include/scsi/scsi_transport_sas.h b/include/scsi/scsi_transport_sas.h
index 62895b4059330..05ec927a3c729 100644
--- a/include/scsi/scsi_transport_sas.h
+++ b/include/scsi/scsi_transport_sas.h
@@ -156,6 +156,7 @@ struct sas_port {
 
 	struct mutex		phy_list_mutex;
 	struct list_head	phy_list;
+	struct list_head	del_list; /* libsas only */
 };
 
 #define dev_to_sas_port(d) \
-- 
2.25.1

Re: [PATCH 4.14 01/51] scsi: libsas: direct call probe and destruct

[John Garry]

On 03/08/2020 13:19, Greg Kroah-Hartman wrote:
> From: Jason Yan <yanaijie@huawei.com>
> 
> [ Upstream commit 0558f33c06bb910e2879e355192227a8e8f0219d ]
> 

Hi Greg,

This patch was one of a series from Jason to fix this WARN issue, below:

https://lore.kernel.org/linux-scsi/8f6e3763-2b04-23e8-f1ec-8ed3c58f55d3@huawei.com/

I'm doubtful that it should be taken in isolation. Maybe 1 or 2 other 
patches are required.

The WARN was really annoying, so we could spend a bit of time to test a 
backport of what is strictly required. Let us know.

Thanks,
John

> In commit 87c8331fcf72 ("[SCSI] libsas: prevent domain rediscovery
> competing with ata error handling") introduced disco mutex to prevent
> rediscovery competing with ata error handling and put the whole
> revalidation in the mutex. But the rphy add/remove needs to wait for the
> error handling which also grabs the disco mutex. This may leads to dead
> lock.So the probe and destruct event were introduce to do the rphy
> add/remove asynchronously and out of the lock.
> 
> The asynchronously processed workers makes the whole discovery process
> not atomic, the other events may interrupt the process. For example,
> if a loss of signal event inserted before the probe event, the
> sas_deform_port() is called and the port will be deleted.
> 
> And sas_port_delete() may run before the destruct event, but the
> port-x:x is the top parent of end device or expander. This leads to
> a kernel WARNING such as:
> 
> [   82.042979] sysfs group 'power' not found for kobject 'phy-1:0:22'
> [   82.042983] ------------[ cut here ]------------
> [   82.042986] WARNING: CPU: 54 PID: 1714 at fs/sysfs/group.c:237
> sysfs_remove_group+0x94/0xa0
> [   82.043059] Call trace:
> [   82.043082] [<ffff0000082e7624>] sysfs_remove_group+0x94/0xa0
> [   82.043085] [<ffff00000864e320>] dpm_sysfs_remove+0x60/0x70
> [   82.043086] [<ffff00000863ee10>] device_del+0x138/0x308
> [   82.043089] [<ffff00000869a2d0>] sas_phy_delete+0x38/0x60
> [   82.043091] [<ffff00000869a86c>] do_sas_phy_delete+0x6c/0x80
> [   82.043093] [<ffff00000863dc20>] device_for_each_child+0x58/0xa0
> [   82.043095] [<ffff000008696f80>] sas_remove_children+0x40/0x50
> [   82.043100] [<ffff00000869d1bc>] sas_destruct_devices+0x64/0xa0
> [   82.043102] [<ffff0000080e93bc>] process_one_work+0x1fc/0x4b0
> [   82.043104] [<ffff0000080e96c0>] worker_thread+0x50/0x490
> [   82.043105] [<ffff0000080f0364>] kthread+0xfc/0x128
> [   82.043107] [<ffff0000080836c0>] ret_from_fork+0x10/0x50
> 
> Make probe and destruct a direct call in the disco and revalidate function,
> but put them outside the lock. The whole discovery or revalidate won't
> be interrupted by other events. And the DISCE_PROBE and DISCE_DESTRUCT
> event are deleted as a result of the direct call.
> 
> Introduce a new list to destruct the sas_port and put the port delete after
> the destruct. This makes sure the right order of destroying the sysfs
> kobject and fix the warning above.
> 
> In sas_ex_revalidate_domain() have a loop to find all broadcasted
> device, and sometimes we have a chance to find the same expander twice.
> Because the sas_port will be deleted at the end of the whole revalidate
> process, sas_port with the same name cannot be added before this.
> Otherwise the sysfs will complain of creating duplicate filename. Since
> the LLDD will send broadcast for every device change, we can only
> process one expander's revalidation.
> 
> [mkp: kbuild test robot warning]
> 
> Signed-off-by: Jason Yan <yanaijie@huawei.com>
> CC: John Garry <john.garry@huawei.com>
> CC: Johannes Thumshirn <jthumshirn@suse.de>
> CC: Ewan Milne <emilne@redhat.com>
> CC: Christoph Hellwig <hch@lst.de>
> CC: Tomas Henzl <thenzl@redhat.com>
> CC: Dan Williams <dan.j.williams@intel.com>
> Reviewed-by: Hannes Reinecke <hare@suse.com>
> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
> Signed-off-by: Sasha Levin <sashal@kernel.org>
> ---

Re: [PATCH 4.14 01/51] scsi: libsas: direct call probe and destruct

[Greg Kroah-Hartman]

On Mon, Aug 03, 2020 at 01:57:14PM +0100, John Garry wrote:
> On 03/08/2020 13:19, Greg Kroah-Hartman wrote:
> > From: Jason Yan <yanaijie@huawei.com>
> > 
> > [ Upstream commit 0558f33c06bb910e2879e355192227a8e8f0219d ]
> > 
> 
> Hi Greg,
> 
> This patch was one of a series from Jason to fix this WARN issue, below:
> 
> https://lore.kernel.org/linux-scsi/8f6e3763-2b04-23e8-f1ec-8ed3c58f55d3@huawei.com/
> 
> I'm doubtful that it should be taken in isolation. Maybe 1 or 2 other
> patches are required.
> 
> The WARN was really annoying, so we could spend a bit of time to test a
> backport of what is strictly required. Let us know.

Ok, I'll drop this for now, if you want to submit the patch series fully
backported, we will be glad to review it.

thanks,

greg k-h

[PATCH 4.14 02/51] net: phy: mdio-bcm-unimac: fix potential NULL dereference in unimac_mdio_probe()

[Greg Kroah-Hartman]

From: Wei Yongjun <weiyongjun1@huawei.com>

[ Upstream commit 297a6961ffb8ff4dc66c9fbf53b924bd1dda05d5 ]

platform_get_resource() may fail and return NULL, so we should
better check it's return value to avoid a NULL pointer dereference
a bit later in the code.

This is detected by Coccinelle semantic patch.

@@
expression pdev, res, n, t, e, e1, e2;
@@

res = platform_get_resource(pdev, t, n);
+ if (!res)
+   return -EINVAL;
... when != res == NULL
e = devm_ioremap(e1, res->start, e2);

Signed-off-by: Wei Yongjun <weiyongjun1@huawei.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/net/phy/mdio-bcm-unimac.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/net/phy/mdio-bcm-unimac.c b/drivers/net/phy/mdio-bcm-unimac.c
index 52703bbd4d666..df75efa96a7d9 100644
--- a/drivers/net/phy/mdio-bcm-unimac.c
+++ b/drivers/net/phy/mdio-bcm-unimac.c
@@ -237,6 +237,8 @@ static int unimac_mdio_probe(struct platform_device *pdev)
 		return -ENOMEM;
 
 	r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	if (!r)
+		return -EINVAL;
 
 	/* Just ioremap, as this MDIO block is usually integrated into an
 	 * Ethernet MAC controller register range
-- 
2.25.1

[PATCH 4.14 03/51] crypto: ccp - Release all allocated memory if sha type is invalid

[Greg Kroah-Hartman]

From: Navid Emamdoost <navid.emamdoost@gmail.com>

[ Upstream commit 128c66429247add5128c03dc1e144ca56f05a4e2 ]

Release all allocated memory if sha type is invalid:
In ccp_run_sha_cmd, if the type of sha is invalid, the allocated
hmac_buf should be released.

v2: fix the goto.

Signed-off-by: Navid Emamdoost <navid.emamdoost@gmail.com>
Acked-by: Gary R Hook <gary.hook@amd.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/crypto/ccp/ccp-ops.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/crypto/ccp/ccp-ops.c b/drivers/crypto/ccp/ccp-ops.c
index 330853a2702f0..43b74cf0787e1 100644
--- a/drivers/crypto/ccp/ccp-ops.c
+++ b/drivers/crypto/ccp/ccp-ops.c
@@ -1783,8 +1783,9 @@ ccp_run_sha_cmd(struct ccp_cmd_queue *cmd_q, struct ccp_cmd *cmd)
 			       LSB_ITEM_SIZE);
 			break;
 		default:
+			kfree(hmac_buf);
 			ret = -EINVAL;
-			goto e_ctx;
+			goto e_data;
 		}
 
 		memset(&hmac_cmd, 0, sizeof(hmac_cmd));
-- 
2.25.1

[PATCH 4.14 04/51] media: rc: prevent memory leak in cx23888_ir_probe

[Greg Kroah-Hartman]

From: Navid Emamdoost <navid.emamdoost@gmail.com>

[ Upstream commit a7b2df76b42bdd026e3106cf2ba97db41345a177 ]

In cx23888_ir_probe if kfifo_alloc fails the allocated memory for state
should be released.

Signed-off-by: Navid Emamdoost <navid.emamdoost@gmail.com>
Signed-off-by: Sean Young <sean@mess.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/media/pci/cx23885/cx23888-ir.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/media/pci/cx23885/cx23888-ir.c b/drivers/media/pci/cx23885/cx23888-ir.c
index 040323b0f9455..f63a7e6f272c2 100644
--- a/drivers/media/pci/cx23885/cx23888-ir.c
+++ b/drivers/media/pci/cx23885/cx23888-ir.c
@@ -1178,8 +1178,11 @@ int cx23888_ir_probe(struct cx23885_dev *dev)
 		return -ENOMEM;
 
 	spin_lock_init(&state->rx_kfifo_lock);
-	if (kfifo_alloc(&state->rx_kfifo, CX23888_IR_RX_KFIFO_SIZE, GFP_KERNEL))
+	if (kfifo_alloc(&state->rx_kfifo, CX23888_IR_RX_KFIFO_SIZE,
+			GFP_KERNEL)) {
+		kfree(state);
 		return -ENOMEM;
+	}
 
 	state->dev = dev;
 	sd = &state->sd;
-- 
2.25.1

[PATCH 4.14 05/51] iio: imu: adis16400: fix memory leak

[Greg Kroah-Hartman]

[ Upstream commit 9c0530e898f384c5d279bfcebd8bb17af1105873 ]

In adis_update_scan_mode_burst, if adis->buffer allocation fails release
the adis->xfer.

Signed-off-by: Navid Emamdoost <navid.emamdoost@gmail.com>
Reviewed-by: Alexandru Ardelean <alexandru.ardelean@analog.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/iio/imu/adis16400_buffer.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/iio/imu/adis16400_buffer.c b/drivers/iio/imu/adis16400_buffer.c
index e70a5339acb19..3fc11aec98b95 100644
--- a/drivers/iio/imu/adis16400_buffer.c
+++ b/drivers/iio/imu/adis16400_buffer.c
@@ -38,8 +38,11 @@ int adis16400_update_scan_mode(struct iio_dev *indio_dev,
 		return -ENOMEM;
 
 	adis->buffer = kzalloc(burst_length + sizeof(u16), GFP_KERNEL);
-	if (!adis->buffer)
+	if (!adis->buffer) {
+		kfree(adis->xfer);
+		adis->xfer = NULL;
 		return -ENOMEM;
+	}
 
 	tx = adis->buffer + burst_length;
 	tx[0] = ADIS_READ_REG(ADIS16400_GLOB_CMD);
-- 
2.25.1

[PATCH 4.14 06/51] ath9k_htc: release allocated buffer if timed out

[Greg Kroah-Hartman]

From: Navid Emamdoost <navid.emamdoost@gmail.com>

[ Upstream commit 853acf7caf10b828102d92d05b5c101666a6142b ]

In htc_config_pipe_credits, htc_setup_complete, and htc_connect_service
if time out happens, the allocated buffer needs to be released.
Otherwise there will be memory leak.

Signed-off-by: Navid Emamdoost <navid.emamdoost@gmail.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/net/wireless/ath/ath9k/htc_hst.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/net/wireless/ath/ath9k/htc_hst.c b/drivers/net/wireless/ath/ath9k/htc_hst.c
index d2e062eaf5614..f705f0e1cb5be 100644
--- a/drivers/net/wireless/ath/ath9k/htc_hst.c
+++ b/drivers/net/wireless/ath/ath9k/htc_hst.c
@@ -173,6 +173,7 @@ static int htc_config_pipe_credits(struct htc_target *target)
 	time_left = wait_for_completion_timeout(&target->cmd_wait, HZ);
 	if (!time_left) {
 		dev_err(target->dev, "HTC credit config timeout\n");
+		kfree_skb(skb);
 		return -ETIMEDOUT;
 	}
 
@@ -208,6 +209,7 @@ static int htc_setup_complete(struct htc_target *target)
 	time_left = wait_for_completion_timeout(&target->cmd_wait, HZ);
 	if (!time_left) {
 		dev_err(target->dev, "HTC start timeout\n");
+		kfree_skb(skb);
 		return -ETIMEDOUT;
 	}
 
@@ -280,6 +282,7 @@ int htc_connect_service(struct htc_target *target,
 	if (!time_left) {
 		dev_err(target->dev, "Service connection timeout for: %d\n",
 			service_connreq->service_id);
+		kfree_skb(skb);
 		return -ETIMEDOUT;
 	}
 
-- 
2.25.1

[PATCH 4.14 07/51] ath9k: release allocated buffer if timed out

[Greg Kroah-Hartman]

From: Navid Emamdoost <navid.emamdoost@gmail.com>

[ Upstream commit 728c1e2a05e4b5fc52fab3421dce772a806612a2 ]

In ath9k_wmi_cmd, the allocated network buffer needs to be released
if timeout happens. Otherwise memory will be leaked.

Signed-off-by: Navid Emamdoost <navid.emamdoost@gmail.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/net/wireless/ath/ath9k/wmi.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/net/wireless/ath/ath9k/wmi.c b/drivers/net/wireless/ath/ath9k/wmi.c
index f57f48e4d7a0a..4b68804f3742e 100644
--- a/drivers/net/wireless/ath/ath9k/wmi.c
+++ b/drivers/net/wireless/ath/ath9k/wmi.c
@@ -338,6 +338,7 @@ int ath9k_wmi_cmd(struct wmi *wmi, enum wmi_cmd_id cmd_id,
 		ath_dbg(common, WMI, "Timeout waiting for WMI command: %s\n",
 			wmi_cmd_to_name(cmd_id));
 		mutex_unlock(&wmi->op_mutex);
+		kfree_skb(skb);
 		return -ETIMEDOUT;
 	}
 
-- 
2.25.1

[PATCH 4.14 08/51] x86/kvm: Be careful not to clear KVM_VCPU_FLUSH_TLB bit

[Greg Kroah-Hartman]

[ Upstream commit 8c6de56a42e0c657955e12b882a81ef07d1d073e ]

kvm_steal_time_set_preempted() may accidentally clear KVM_VCPU_FLUSH_TLB
bit if it is called more than once while VCPU is preempted.

This is part of CVE-2019-3016.

(This bug was also independently discovered by Jim Mattson
<jmattson@google.com>)

Signed-off-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Reviewed-by: Joao Martins <joao.m.martins@oracle.com>
Cc: stable@vger.kernel.org
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 arch/x86/kvm/x86.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 09f47c837c258..3aed03942d7d4 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -3075,6 +3075,9 @@ static void kvm_steal_time_set_preempted(struct kvm_vcpu *vcpu)
 	if (!(vcpu->arch.st.msr_val & KVM_MSR_ENABLED))
 		return;
 
+	if (vcpu->arch.st.steal.preempted)
+		return;
+
 	vcpu->arch.st.steal.preempted = 1;
 
 	kvm_write_guest_offset_cached(vcpu->kvm, &vcpu->arch.st.stime,
-- 
2.25.1

[PATCH 4.14 09/51] PCI/ASPM: Disable ASPM on ASMedia ASM1083/1085 PCIe-to-PCI bridge

[Greg Kroah-Hartman]

From: Robert Hancock <hancockrwd@gmail.com>

commit b361663c5a40c8bc758b7f7f2239f7a192180e7c upstream.

Recently ASPM handling was changed to allow ASPM on PCIe-to-PCI/PCI-X
bridges.  Unfortunately the ASMedia ASM1083/1085 PCIe to PCI bridge device
doesn't seem to function properly with ASPM enabled.  On an Asus PRIME
H270-PRO motherboard, it causes errors like these:

  pcieport 0000:00:1c.0: AER: PCIe Bus Error: severity=Corrected, type=Data Link Layer, (Transmitter ID)
  pcieport 0000:00:1c.0: AER:   device [8086:a292] error status/mask=00003000/00002000
  pcieport 0000:00:1c.0: AER:    [12] Timeout
  pcieport 0000:00:1c.0: AER: Corrected error received: 0000:00:1c.0
  pcieport 0000:00:1c.0: AER: can't find device of ID00e0

In addition to flooding the kernel log, this also causes the machine to
wake up immediately after suspend is initiated.

The device advertises ASPM L0s and L1 support in the Link Capabilities
register, but the ASMedia web page for ASM1083 [1] claims "No PCIe ASPM
support".

Windows 10 (build 2004) enables L0s, but it also logs correctable PCIe
errors.

Add a quirk to disable ASPM for this device.

[1] https://www.asmedia.com.tw/eng/e_show_products.php?cate_index=169&item=114

[bhelgaas: commit log]
Fixes: 66ff14e59e8a ("PCI/ASPM: Allow ASPM on links to PCIe-to-PCI/PCI-X Bridges")
Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=208667
Link: https://lore.kernel.org/r/20200722021803.17958-1-hancockrwd@gmail.com
Signed-off-by: Robert Hancock <hancockrwd@gmail.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 drivers/pci/quirks.c |   13 +++++++++++++
 1 file changed, 13 insertions(+)

--- a/drivers/pci/quirks.c
+++ b/drivers/pci/quirks.c
@@ -2086,6 +2086,19 @@ DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_IN
 DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_INTEL, 0x10f4, quirk_disable_aspm_l0s);
 DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_INTEL, 0x1508, quirk_disable_aspm_l0s);
 
+static void quirk_disable_aspm_l0s_l1(struct pci_dev *dev)
+{
+	pci_info(dev, "Disabling ASPM L0s/L1\n");
+	pci_disable_link_state(dev, PCIE_LINK_STATE_L0S | PCIE_LINK_STATE_L1);
+}
+
+/*
+ * ASM1083/1085 PCIe-PCI bridge devices cause AER timeout errors on the
+ * upstream PCIe root port when ASPM is enabled. At least L0s mode is affected;
+ * disable both L0s and L1 for now to be safe.
+ */
+DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_ASMEDIA, 0x1080, quirk_disable_aspm_l0s_l1);
+
 /*
  * Some Pericom PCIe-to-PCI bridges in reverse mode need the PCIe Retrain
  * Link bit cleared after starting the link retrain process to allow this

[PATCH 4.14 10/51] wireless: Use offsetof instead of custom macro.

[Greg Kroah-Hartman]

From: Pi-Hsun Shih <pihsun@chromium.org>

commit 6989310f5d4327e8595664954edd40a7f99ddd0d upstream.

Use offsetof to calculate offset of a field to take advantage of
compiler built-in version when possible, and avoid UBSAN warning when
compiling with Clang:

==================================================================
UBSAN: Undefined behaviour in net/wireless/wext-core.c:525:14
member access within null pointer of type 'struct iw_point'
CPU: 3 PID: 165 Comm: kworker/u16:3 Tainted: G S      W         4.19.23 #43
Workqueue: cfg80211 __cfg80211_scan_done [cfg80211]
Call trace:
 dump_backtrace+0x0/0x194
 show_stack+0x20/0x2c
 __dump_stack+0x20/0x28
 dump_stack+0x70/0x94
 ubsan_epilogue+0x14/0x44
 ubsan_type_mismatch_common+0xf4/0xfc
 __ubsan_handle_type_mismatch_v1+0x34/0x54
 wireless_send_event+0x3cc/0x470
 ___cfg80211_scan_done+0x13c/0x220 [cfg80211]
 __cfg80211_scan_done+0x28/0x34 [cfg80211]
 process_one_work+0x170/0x35c
 worker_thread+0x254/0x380
 kthread+0x13c/0x158
 ret_from_fork+0x10/0x18
===================================================================

Signed-off-by: Pi-Hsun Shih <pihsun@chromium.org>
Reviewed-by: Nick Desaulniers <ndesaulniers@google.com>
Link: https://lore.kernel.org/r/20191204081307.138765-1-pihsun@chromium.org
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Nick Desaulniers <ndesaulniers@google.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 include/uapi/linux/wireless.h |    5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

--- a/include/uapi/linux/wireless.h
+++ b/include/uapi/linux/wireless.h
@@ -74,6 +74,8 @@
 #include <linux/socket.h>		/* for "struct sockaddr" et al	*/
 #include <linux/if.h>			/* for IFNAMSIZ and co... */
 
+#include <stddef.h>                     /* for offsetof */
+
 /***************************** VERSION *****************************/
 /*
  * This constant is used to know the availability of the wireless
@@ -1090,8 +1092,7 @@ struct iw_event {
 /* iw_point events are special. First, the payload (extra data) come at
  * the end of the event, so they are bigger than IW_EV_POINT_LEN. Second,
  * we omit the pointer, so start at an offset. */
-#define IW_EV_POINT_OFF (((char *) &(((struct iw_point *) NULL)->length)) - \
-			  (char *) NULL)
+#define IW_EV_POINT_OFF offsetof(struct iw_point, length)
 #define IW_EV_POINT_LEN	(IW_EV_LCP_LEN + sizeof(struct iw_point) - \
 			 IW_EV_POINT_OFF)
 

[PATCH 4.14 11/51] ARM: 8986/1: hw_breakpoint: Dont invoke overflow handler on uaccess watchpoints

[Greg Kroah-Hartman]

From: Will Deacon <will@kernel.org>

commit eec13b42d41b0f3339dcf0c4da43734427c68620 upstream.

Unprivileged memory accesses generated by the so-called "translated"
instructions (e.g. LDRT) in kernel mode can cause user watchpoints to fire
unexpectedly. In such cases, the hw_breakpoint logic will invoke the user
overflow handler which will typically raise a SIGTRAP back to the current
task. This is futile when returning back to the kernel because (a) the
signal won't have been delivered and (b) userspace can't handle the thing
anyway.

Avoid invoking the user overflow handler for watchpoints triggered by
kernel uaccess routines, and instead single-step over the faulting
instruction as we would if no overflow handler had been installed.

Cc: <stable@vger.kernel.org>
Fixes: f81ef4a920c8 ("ARM: 6356/1: hw-breakpoint: add ARM backend for the hw-breakpoint framework")
Reported-by: Luis Machado <luis.machado@linaro.org>
Tested-by: Luis Machado <luis.machado@linaro.org>
Signed-off-by: Will Deacon <will@kernel.org>
Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 arch/arm/kernel/hw_breakpoint.c |   27 ++++++++++++++++++++++-----
 1 file changed, 22 insertions(+), 5 deletions(-)

--- a/arch/arm/kernel/hw_breakpoint.c
+++ b/arch/arm/kernel/hw_breakpoint.c
@@ -688,6 +688,12 @@ static void disable_single_step(struct p
 	arch_install_hw_breakpoint(bp);
 }
 
+static int watchpoint_fault_on_uaccess(struct pt_regs *regs,
+				       struct arch_hw_breakpoint *info)
+{
+	return !user_mode(regs) && info->ctrl.privilege == ARM_BREAKPOINT_USER;
+}
+
 static void watchpoint_handler(unsigned long addr, unsigned int fsr,
 			       struct pt_regs *regs)
 {
@@ -747,16 +753,27 @@ static void watchpoint_handler(unsigned
 		}
 
 		pr_debug("watchpoint fired: address = 0x%x\n", info->trigger);
+
+		/*
+		 * If we triggered a user watchpoint from a uaccess routine,
+		 * then handle the stepping ourselves since userspace really
+		 * can't help us with this.
+		 */
+		if (watchpoint_fault_on_uaccess(regs, info))
+			goto step;
+
 		perf_bp_event(wp, regs);
 
 		/*
-		 * If no overflow handler is present, insert a temporary
-		 * mismatch breakpoint so we can single-step over the
-		 * watchpoint trigger.
+		 * Defer stepping to the overflow handler if one is installed.
+		 * Otherwise, insert a temporary mismatch breakpoint so that
+		 * we can single-step over the watchpoint trigger.
 		 */
-		if (is_default_overflow_handler(wp))
-			enable_single_step(wp, instruction_pointer(regs));
+		if (!is_default_overflow_handler(wp))
+			goto unlock;
 
+step:
+		enable_single_step(wp, instruction_pointer(regs));
 unlock:
 		rcu_read_unlock();
 	}

[PATCH 4.14 12/51] random32: update the net random state on interrupt and activity

[Greg Kroah-Hartman]

From: Willy Tarreau <w@1wt.eu>

commit f227e3ec3b5cad859ad15666874405e8c1bbc1d4 upstream.

This modifies the first 32 bits out of the 128 bits of a random CPU's
net_rand_state on interrupt or CPU activity to complicate remote
observations that could lead to guessing the network RNG's internal
state.

Note that depending on some network devices' interrupt rate moderation
or binding, this re-seeding might happen on every packet or even almost
never.

In addition, with NOHZ some CPUs might not even get timer interrupts,
leaving their local state rarely updated, while they are running
networked processes making use of the random state.  For this reason, we
also perform this update in update_process_times() in order to at least
update the state when there is user or system activity, since it's the
only case we care about.

Reported-by: Amit Klein <aksecurity@gmail.com>
Suggested-by: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Eric Dumazet <edumazet@google.com>
Cc: "Jason A. Donenfeld" <Jason@zx2c4.com>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Kees Cook <keescook@chromium.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: <stable@vger.kernel.org>
Signed-off-by: Willy Tarreau <w@1wt.eu>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 drivers/char/random.c  |    1 +
 include/linux/random.h |    3 +++
 kernel/time/timer.c    |    8 ++++++++
 lib/random32.c         |    2 +-
 4 files changed, 13 insertions(+), 1 deletion(-)

--- a/drivers/char/random.c
+++ b/drivers/char/random.c
@@ -1246,6 +1246,7 @@ void add_interrupt_randomness(int irq, i
 
 	fast_mix(fast_pool);
 	add_interrupt_bench(cycles);
+	this_cpu_add(net_rand_state.s1, fast_pool->pool[cycles & 3]);
 
 	if (unlikely(crng_init == 0)) {
 		if ((fast_pool->count >= 64) &&
--- a/include/linux/random.h
+++ b/include/linux/random.h
@@ -9,6 +9,7 @@
 
 #include <linux/list.h>
 #include <linux/once.h>
+#include <linux/percpu.h>
 
 #include <uapi/linux/random.h>
 
@@ -116,6 +117,8 @@ struct rnd_state {
 	__u32 s1, s2, s3, s4;
 };
 
+DECLARE_PER_CPU(struct rnd_state, net_rand_state) __latent_entropy;
+
 u32 prandom_u32_state(struct rnd_state *state);
 void prandom_bytes_state(struct rnd_state *state, void *buf, size_t nbytes);
 void prandom_seed_full_state(struct rnd_state __percpu *pcpu_state);
--- a/kernel/time/timer.c
+++ b/kernel/time/timer.c
@@ -44,6 +44,7 @@
 #include <linux/sched/debug.h>
 #include <linux/slab.h>
 #include <linux/compat.h>
+#include <linux/random.h>
 
 #include <linux/uaccess.h>
 #include <asm/unistd.h>
@@ -1595,6 +1596,13 @@ void update_process_times(int user_tick)
 	scheduler_tick();
 	if (IS_ENABLED(CONFIG_POSIX_TIMERS))
 		run_posix_cpu_timers(p);
+
+	/* The current CPU might make use of net randoms without receiving IRQs
+	 * to renew them often enough. Let's update the net_rand_state from a
+	 * non-constant value that's not affine to the number of calls to make
+	 * sure it's updated when there's some activity (we don't care in idle).
+	 */
+	this_cpu_add(net_rand_state.s1, rol32(jiffies, 24) + user_tick);
 }
 
 /**
--- a/lib/random32.c
+++ b/lib/random32.c
@@ -48,7 +48,7 @@ static inline void prandom_state_selftes
 }
 #endif
 
-static DEFINE_PER_CPU(struct rnd_state, net_rand_state) __latent_entropy;
+DEFINE_PER_CPU(struct rnd_state, net_rand_state) __latent_entropy;
 
 /**
  *	prandom_u32_state - seeded pseudo-random number generator.

[PATCH 4.14 13/51] ARM: percpu.h: fix build error

[Greg Kroah-Hartman]

From: Grygorii Strashko <grygorii.strashko@ti.com>

commit aa54ea903abb02303bf55855fb51e3fcee135d70 upstream.

Fix build error for the case:
  defined(CONFIG_SMP) && !defined(CONFIG_CPU_V6)

config: keystone_defconfig

  CC      arch/arm/kernel/signal.o
  In file included from ../include/linux/random.h:14,
                    from ../arch/arm/kernel/signal.c:8:
  ../arch/arm/include/asm/percpu.h: In function ‘__my_cpu_offset’:
  ../arch/arm/include/asm/percpu.h:29:34: error: ‘current_stack_pointer’ undeclared (first use in this function); did you mean ‘user_stack_pointer’?
      : "Q" (*(const unsigned long *)current_stack_pointer));
                                     ^~~~~~~~~~~~~~~~~~~~~
                                     user_stack_pointer

Fixes: f227e3ec3b5c ("random32: update the net random state on interrupt and activity")
Signed-off-by: Grygorii Strashko <grygorii.strashko@ti.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 arch/arm/include/asm/percpu.h |    2 ++
 1 file changed, 2 insertions(+)

--- a/arch/arm/include/asm/percpu.h
+++ b/arch/arm/include/asm/percpu.h
@@ -16,6 +16,8 @@
 #ifndef _ASM_ARM_PERCPU_H_
 #define _ASM_ARM_PERCPU_H_
 
+#include <asm/thread_info.h>
+
 /*
  * Same as asm-generic/percpu.h, except that we store the per cpu offset
  * in the TPIDRPRW. TPIDRPRW only exists on V6K and V7

[PATCH 4.14 14/51] drm/amdgpu: Prevent kernel-infoleak in amdgpu_info_ioctl()

[Greg Kroah-Hartman]

From: Peilin Ye <yepeilin.cs@gmail.com>

commit 543e8669ed9bfb30545fd52bc0e047ca4df7fb31 upstream.

Compiler leaves a 4-byte hole near the end of `dev_info`, causing
amdgpu_info_ioctl() to copy uninitialized kernel stack memory to userspace
when `size` is greater than 356.

In 2015 we tried to fix this issue by doing `= {};` on `dev_info`, which
unfortunately does not initialize that 4-byte hole. Fix it by using
memset() instead.

Cc: stable@vger.kernel.org
Fixes: c193fa91b918 ("drm/amdgpu: information leak in amdgpu_info_ioctl()")
Fixes: d38ceaf99ed0 ("drm/amdgpu: add core driver (v4)")
Suggested-by: Dan Carpenter <dan.carpenter@oracle.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Peilin Ye <yepeilin.cs@gmail.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c
@@ -527,8 +527,9 @@ static int amdgpu_info_ioctl(struct drm_
 		return n ? -EFAULT : 0;
 	}
 	case AMDGPU_INFO_DEV_INFO: {
-		struct drm_amdgpu_info_device dev_info = {};
+		struct drm_amdgpu_info_device dev_info;
 
+		memset(&dev_info, 0, sizeof(dev_info));
 		dev_info.device_id = dev->pdev->device;
 		dev_info.chip_rev = adev->rev_id;
 		dev_info.external_rev = adev->external_rev_id;

[PATCH 4.14 15/51] drm: hold gem reference until object is no longer accessed

[Greg Kroah-Hartman]

From: Steve Cohen <cohens@codeaurora.org>

commit 8490d6a7e0a0a6fab5c2d82d57a3937306660864 upstream.

A use-after-free in drm_gem_open_ioctl can happen if the
GEM object handle is closed between the idr lookup and
retrieving the size from said object since a local reference
is not being held at that point. Hold the local reference
while the object can still be accessed to fix this and
plug the potential security hole.

Signed-off-by: Steve Cohen <cohens@codeaurora.org>
Cc: stable@vger.kernel.org
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: https://patchwork.freedesktop.org/patch/msgid/1595284250-31580-1-git-send-email-cohens@codeaurora.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 drivers/gpu/drm/drm_gem.c |   10 ++++------
 1 file changed, 4 insertions(+), 6 deletions(-)

--- a/drivers/gpu/drm/drm_gem.c
+++ b/drivers/gpu/drm/drm_gem.c
@@ -730,9 +730,6 @@ err:
  * @file_priv: drm file-private structure
  *
  * Open an object using the global name, returning a handle and the size.
- *
- * This handle (of course) holds a reference to the object, so the object
- * will not go away until the handle is deleted.
  */
 int
 drm_gem_open_ioctl(struct drm_device *dev, void *data,
@@ -757,14 +754,15 @@ drm_gem_open_ioctl(struct drm_device *de
 
 	/* drm_gem_handle_create_tail unlocks dev->object_name_lock. */
 	ret = drm_gem_handle_create_tail(file_priv, obj, &handle);
-	drm_gem_object_put_unlocked(obj);
 	if (ret)
-		return ret;
+		goto err;
 
 	args->handle = handle;
 	args->size = obj->size;
 
-	return 0;
+err:
+	drm_gem_object_put_unlocked(obj);
+	return ret;
 }
 
 /**

[PATCH 4.14 16/51] f2fs: check memory boundary by insane namelen

[Greg Kroah-Hartman]

From: Jaegeuk Kim <jaegeuk@kernel.org>

[ Upstream commit 4e240d1bab1ead280ddf5eb05058dba6bbd57d10 ]

If namelen is corrupted to have very long value, fill_dentries can copy
wrong memory area.

Reviewed-by: Chao Yu <yuchao0@huawei.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 fs/f2fs/dir.c | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/fs/f2fs/dir.c b/fs/f2fs/dir.c
index 4abefd841b6c7..7a177b8f227d2 100644
--- a/fs/f2fs/dir.c
+++ b/fs/f2fs/dir.c
@@ -817,6 +817,16 @@ int f2fs_fill_dentries(struct dir_context *ctx, struct f2fs_dentry_ptr *d,
 		de_name.name = d->filename[bit_pos];
 		de_name.len = le16_to_cpu(de->name_len);
 
+		/* check memory boundary before moving forward */
+		bit_pos += GET_DENTRY_SLOTS(le16_to_cpu(de->name_len));
+		if (unlikely(bit_pos > d->max)) {
+			f2fs_msg(F2FS_I_SB(d->inode)->sb, KERN_WARNING,
+				"%s: corrupted namelen=%d, run fsck to fix.",
+				__func__, le16_to_cpu(de->name_len));
+			set_sbi_flag(F2FS_I_SB(d->inode)->sb->s_fs_info, SBI_NEED_FSCK);
+			return -EINVAL;
+		}
+
 		if (f2fs_encrypted_inode(d->inode)) {
 			int save_len = fstr->len;
 			int err;
@@ -835,7 +845,6 @@ int f2fs_fill_dentries(struct dir_context *ctx, struct f2fs_dentry_ptr *d,
 					le32_to_cpu(de->ino), d_type))
 			return 1;
 
-		bit_pos += GET_DENTRY_SLOTS(le16_to_cpu(de->name_len));
 		ctx->pos = start_pos + bit_pos;
 	}
 	return 0;
-- 
2.25.1

[PATCH 4.14 17/51] f2fs: check if file namelen exceeds max value

[Greg Kroah-Hartman]

From: Sheng Yong <shengyong1@huawei.com>

[ Upstream commit 720db068634c91553a8e1d9a0fcd8c7050e06d2b ]

Dentry bitmap is not enough to detect incorrect dentries. So this patch
also checks the namelen value of a dentry.

Signed-off-by: Gong Chen <gongchen4@huawei.com>
Signed-off-by: Sheng Yong <shengyong1@huawei.com>
Reviewed-by: Chao Yu <yuchao0@huawei.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 fs/f2fs/dir.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/fs/f2fs/dir.c b/fs/f2fs/dir.c
index 7a177b8f227d2..ff519f7a87847 100644
--- a/fs/f2fs/dir.c
+++ b/fs/f2fs/dir.c
@@ -819,7 +819,8 @@ int f2fs_fill_dentries(struct dir_context *ctx, struct f2fs_dentry_ptr *d,
 
 		/* check memory boundary before moving forward */
 		bit_pos += GET_DENTRY_SLOTS(le16_to_cpu(de->name_len));
-		if (unlikely(bit_pos > d->max)) {
+		if (unlikely(bit_pos > d->max ||
+				le16_to_cpu(de->name_len) > F2FS_NAME_LEN)) {
 			f2fs_msg(F2FS_I_SB(d->inode)->sb, KERN_WARNING,
 				"%s: corrupted namelen=%d, run fsck to fix.",
 				__func__, le16_to_cpu(de->name_len));
-- 
2.25.1

[PATCH 4.14 18/51] random: fix circular include dependency on arm64 after addition of percpu.h

[Greg Kroah-Hartman]

From: Willy Tarreau <w@1wt.eu>

commit 1c9df907da83812e4f33b59d3d142c864d9da57f upstream.

Daniel Díaz and Kees Cook independently reported that commit
f227e3ec3b5c ("random32: update the net random state on interrupt and
activity") broke arm64 due to a circular dependency on include files
since the addition of percpu.h in random.h.

The correct fix would definitely be to move all the prandom32 stuff out
of random.h but for backporting, a smaller solution is preferred.

This one replaces linux/percpu.h with asm/percpu.h, and this fixes the
problem on x86_64, arm64, arm, and mips.  Note that moving percpu.h
around didn't change anything and that removing it entirely broke
differently.  When backporting, such options might still be considered
if this patch fails to help.

[ It turns out that an alternate fix seems to be to just remove the
  troublesome <asm/pointer_auth.h> remove from the arm64 <asm/smp.h>
  that causes the circular dependency.

  But we might as well do the whole belt-and-suspenders thing, and
  minimize inclusion in <linux/random.h> too. Either will fix the
  problem, and both are good changes.   - Linus ]

Reported-by: Daniel Díaz <daniel.diaz@linaro.org>
Reported-by: Kees Cook <keescook@chromium.org>
Tested-by: Marc Zyngier <maz@kernel.org>
Fixes: f227e3ec3b5c
Cc: Stephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: Willy Tarreau <w@1wt.eu>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 include/linux/random.h |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/include/linux/random.h
+++ b/include/linux/random.h
@@ -9,7 +9,7 @@
 
 #include <linux/list.h>
 #include <linux/once.h>
-#include <linux/percpu.h>
+#include <asm/percpu.h>
 
 #include <uapi/linux/random.h>
 

[PATCH 4.14 19/51] random32: remove net_rand_state from the latent entropy gcc plugin

[Greg Kroah-Hartman]

From: Linus Torvalds <torvalds@linux-foundation.org>

commit 83bdc7275e6206f560d247be856bceba3e1ed8f2 upstream.

It turns out that the plugin right now ends up being really unhappy
about the change from 'static' to 'extern' storage that happened in
commit f227e3ec3b5c ("random32: update the net random state on interrupt
and activity").

This is probably a trivial fix for the latent_entropy plugin, but for
now, just remove net_rand_state from the list of things the plugin
worries about.

Reported-by: Stephen Rothwell <sfr@canb.auug.org.au>
Cc: Emese Revfy <re.emese@gmail.com>
Cc: Kees Cook <keescook@chromium.org>
Cc: Willy Tarreau <w@1wt.eu>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 include/linux/random.h |    2 +-
 lib/random32.c         |    2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

--- a/include/linux/random.h
+++ b/include/linux/random.h
@@ -117,7 +117,7 @@ struct rnd_state {
 	__u32 s1, s2, s3, s4;
 };
 
-DECLARE_PER_CPU(struct rnd_state, net_rand_state) __latent_entropy;
+DECLARE_PER_CPU(struct rnd_state, net_rand_state);
 
 u32 prandom_u32_state(struct rnd_state *state);
 void prandom_bytes_state(struct rnd_state *state, void *buf, size_t nbytes);
--- a/lib/random32.c
+++ b/lib/random32.c
@@ -48,7 +48,7 @@ static inline void prandom_state_selftes
 }
 #endif
 
-DEFINE_PER_CPU(struct rnd_state, net_rand_state) __latent_entropy;
+DEFINE_PER_CPU(struct rnd_state, net_rand_state);
 
 /**
  *	prandom_u32_state - seeded pseudo-random number generator.

[PATCH 4.14 20/51] 9p/trans_fd: abort p9_read_work if req status changed

[Greg Kroah-Hartman]

From: Dominique Martinet <dominique.martinet@cea.fr>

[ Upstream commit e4ca13f7d075e551dc158df6af18fb412a1dba0a ]

p9_read_work would try to handle an errored req even if it got put to
error state by another thread between the lookup (that worked) and the
time it had been fully read.
The request itself is safe to use because we hold a ref to it from the
lookup (for m->rreq, so it was safe to read into the request data buffer
until this point), but the req_list has been deleted at the same time
status changed, and client_cb already has been called as well, so we
should not do either.

Link: http://lkml.kernel.org/r/1539057956-23741-1-git-send-email-asmadeus@codewreck.org
Signed-off-by: Dominique Martinet <dominique.martinet@cea.fr>
Reported-by: syzbot+2222c34dc40b515f30dc@syzkaller.appspotmail.com
Cc: Eric Van Hensbergen <ericvh@gmail.com>
Cc: Latchesar Ionkov <lucho@ionkov.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 net/9p/trans_fd.c | 17 +++++++++++------
 1 file changed, 11 insertions(+), 6 deletions(-)

diff --git a/net/9p/trans_fd.c b/net/9p/trans_fd.c
index a9c65f13b7f51..cbd8cfafb7940 100644
--- a/net/9p/trans_fd.c
+++ b/net/9p/trans_fd.c
@@ -301,7 +301,6 @@ static void p9_read_work(struct work_struct *work)
 {
 	int n, err;
 	struct p9_conn *m;
-	int status = REQ_STATUS_ERROR;
 
 	m = container_of(work, struct p9_conn, rq);
 
@@ -381,11 +380,17 @@ static void p9_read_work(struct work_struct *work)
 	if ((m->req) && (m->rc.offset == m->rc.capacity)) {
 		p9_debug(P9_DEBUG_TRANS, "got new packet\n");
 		spin_lock(&m->client->lock);
-		if (m->req->status != REQ_STATUS_ERROR)
-			status = REQ_STATUS_RCVD;
-		list_del(&m->req->req_list);
-		/* update req->status while holding client->lock  */
-		p9_client_cb(m->client, m->req, status);
+		if (m->req->status == REQ_STATUS_SENT) {
+			list_del(&m->req->req_list);
+			p9_client_cb(m->client, m->req, REQ_STATUS_RCVD);
+		} else {
+			spin_unlock(&m->client->lock);
+			p9_debug(P9_DEBUG_ERROR,
+				 "Request tag %d errored out while we were reading the reply\n",
+				 m->rc.tag);
+			err = -EIO;
+			goto error;
+		}
 		spin_unlock(&m->client->lock);
 		m->rc.sdata = NULL;
 		m->rc.offset = 0;
-- 
2.25.1

[PATCH 4.14 21/51] 9p/trans_fd: Fix concurrency del of req_list in p9_fd_cancelled/p9_read_work

[Greg Kroah-Hartman]

From: Wang Hai <wanghai38@huawei.com>

[ Upstream commit 74d6a5d5662975aed7f25952f62efbb6f6dadd29 ]

p9_read_work and p9_fd_cancelled may be called concurrently.
In some cases, req->req_list may be deleted by both p9_read_work
and p9_fd_cancelled.

We can fix it by ignoring replies associated with a cancelled
request and ignoring cancelled request if message has been received
before lock.

Link: http://lkml.kernel.org/r/20200612090833.36149-1-wanghai38@huawei.com
Fixes: 60ff779c4abb ("9p: client: remove unused code and any reference to "cancelled" function")
Cc: <stable@vger.kernel.org> # v3.12+
Reported-by: syzbot+77a25acfa0382e06ab23@syzkaller.appspotmail.com
Signed-off-by: Wang Hai <wanghai38@huawei.com>
Signed-off-by: Dominique Martinet <asmadeus@codewreck.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 net/9p/trans_fd.c | 15 ++++++++++++++-
 1 file changed, 14 insertions(+), 1 deletion(-)

diff --git a/net/9p/trans_fd.c b/net/9p/trans_fd.c
index cbd8cfafb7940..32de8afbfbf8e 100644
--- a/net/9p/trans_fd.c
+++ b/net/9p/trans_fd.c
@@ -383,6 +383,10 @@ static void p9_read_work(struct work_struct *work)
 		if (m->req->status == REQ_STATUS_SENT) {
 			list_del(&m->req->req_list);
 			p9_client_cb(m->client, m->req, REQ_STATUS_RCVD);
+		} else if (m->req->status == REQ_STATUS_FLSHD) {
+			/* Ignore replies associated with a cancelled request. */
+			p9_debug(P9_DEBUG_TRANS,
+				 "Ignore replies associated with a cancelled request\n");
 		} else {
 			spin_unlock(&m->client->lock);
 			p9_debug(P9_DEBUG_ERROR,
@@ -717,11 +721,20 @@ static int p9_fd_cancelled(struct p9_client *client, struct p9_req_t *req)
 {
 	p9_debug(P9_DEBUG_TRANS, "client %p req %p\n", client, req);
 
+	spin_lock(&client->lock);
+	/* Ignore cancelled request if message has been received
+	 * before lock.
+	 */
+	if (req->status == REQ_STATUS_RCVD) {
+		spin_unlock(&client->lock);
+		return 0;
+	}
+
 	/* we haven't received a response for oldreq,
 	 * remove it from the list.
 	 */
-	spin_lock(&client->lock);
 	list_del(&req->req_list);
+	req->status = REQ_STATUS_FLSHD;
 	spin_unlock(&client->lock);
 
 	return 0;
-- 
2.25.1

[PATCH 4.14 22/51] x86/build/lto: Fix truncated .bss with -fdata-sections

[Greg Kroah-Hartman]

From: Sami Tolvanen <samitolvanen@google.com>

[ Upstream commit 6a03469a1edc94da52b65478f1e00837add869a3 ]

With CONFIG_LD_DEAD_CODE_DATA_ELIMINATION=y, we compile the kernel with
-fdata-sections, which also splits the .bss section.

The new section, with a new .bss.* name, which pattern gets missed by the
main x86 linker script which only expects the '.bss' name. This results
in the discarding of the second part and a too small, truncated .bss
section and an unhappy, non-working kernel.

Use the common BSS_MAIN macro in the linker script to properly capture
and merge all the generated BSS sections.

Signed-off-by: Sami Tolvanen <samitolvanen@google.com>
Reviewed-by: Nick Desaulniers <ndesaulniers@google.com>
Reviewed-by: Kees Cook <keescook@chromium.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Kees Cook <keescook@chromium.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Nicholas Piggin <npiggin@gmail.com>
Cc: Nick Desaulniers <ndesaulniers@google.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/20190415164956.124067-1-samitolvanen@google.com
[ Extended the changelog. ]
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 arch/x86/kernel/vmlinux.lds.S | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/x86/kernel/vmlinux.lds.S b/arch/x86/kernel/vmlinux.lds.S
index 8d8e33b720b4e..f9f33a168a002 100644
--- a/arch/x86/kernel/vmlinux.lds.S
+++ b/arch/x86/kernel/vmlinux.lds.S
@@ -352,7 +352,7 @@ SECTIONS
 	.bss : AT(ADDR(.bss) - LOAD_OFFSET) {
 		__bss_start = .;
 		*(.bss..page_aligned)
-		*(.bss)
+		*(BSS_MAIN)
 		. = ALIGN(PAGE_SIZE);
 		__bss_stop = .;
 	}
-- 
2.25.1

[PATCH 4.14 23/51] x86, vmlinux.lds: Page-align end of ..page_aligned sections

[Greg Kroah-Hartman]

From: Joerg Roedel <jroedel@suse.de>

[ Upstream commit de2b41be8fcccb2f5b6c480d35df590476344201 ]

On x86-32 the idt_table with 256 entries needs only 2048 bytes. It is
page-aligned, but the end of the .bss..page_aligned section is not
guaranteed to be page-aligned.

As a result, objects from other .bss sections may end up on the same 4k
page as the idt_table, and will accidentially get mapped read-only during
boot, causing unexpected page-faults when the kernel writes to them.

This could be worked around by making the objects in the page aligned
sections page sized, but that's wrong.

Explicit sections which store only page aligned objects have an implicit
guarantee that the object is alone in the page in which it is placed. That
works for all objects except the last one. That's inconsistent.

Enforcing page sized objects for these sections would wreckage memory
sanitizers, because the object becomes artificially larger than it should
be and out of bound access becomes legit.

Align the end of the .bss..page_aligned and .data..page_aligned section on
page-size so all objects places in these sections are guaranteed to have
their own page.

[ tglx: Amended changelog ]

Signed-off-by: Joerg Roedel <jroedel@suse.de>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Kees Cook <keescook@chromium.org>
Cc: stable@vger.kernel.org
Link: https://lkml.kernel.org/r/20200721093448.10417-1-joro@8bytes.org
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 arch/x86/kernel/vmlinux.lds.S     | 1 +
 include/asm-generic/vmlinux.lds.h | 5 ++++-
 2 files changed, 5 insertions(+), 1 deletion(-)

diff --git a/arch/x86/kernel/vmlinux.lds.S b/arch/x86/kernel/vmlinux.lds.S
index f9f33a168a002..d3dc8bc6b3adf 100644
--- a/arch/x86/kernel/vmlinux.lds.S
+++ b/arch/x86/kernel/vmlinux.lds.S
@@ -352,6 +352,7 @@ SECTIONS
 	.bss : AT(ADDR(.bss) - LOAD_OFFSET) {
 		__bss_start = .;
 		*(.bss..page_aligned)
+		. = ALIGN(PAGE_SIZE);
 		*(BSS_MAIN)
 		. = ALIGN(PAGE_SIZE);
 		__bss_stop = .;
diff --git a/include/asm-generic/vmlinux.lds.h b/include/asm-generic/vmlinux.lds.h
index c229ffbed6d4c..48e618b20d34b 100644
--- a/include/asm-generic/vmlinux.lds.h
+++ b/include/asm-generic/vmlinux.lds.h
@@ -251,7 +251,8 @@
 
 #define PAGE_ALIGNED_DATA(page_align)					\
 	. = ALIGN(page_align);						\
-	*(.data..page_aligned)
+	*(.data..page_aligned)						\
+	. = ALIGN(page_align);
 
 #define READ_MOSTLY_DATA(align)						\
 	. = ALIGN(align);						\
@@ -619,7 +620,9 @@
 	. = ALIGN(bss_align);						\
 	.bss : AT(ADDR(.bss) - LOAD_OFFSET) {				\
 		BSS_FIRST_SECTIONS					\
+		. = ALIGN(PAGE_SIZE);					\
 		*(.bss..page_aligned)					\
+		. = ALIGN(PAGE_SIZE);					\
 		*(.dynbss)						\
 		*(BSS_MAIN)						\
 		*(COMMON)						\
-- 
2.25.1

[PATCH 4.14 24/51] rds: Prevent kernel-infoleak in rds_notify_queue_get()

[Greg Kroah-Hartman]

From: Peilin Ye <yepeilin.cs@gmail.com>

commit bbc8a99e952226c585ac17477a85ef1194501762 upstream.

rds_notify_queue_get() is potentially copying uninitialized kernel stack
memory to userspace since the compiler may leave a 4-byte hole at the end
of `cmsg`.

In 2016 we tried to fix this issue by doing `= { 0 };` on `cmsg`, which
unfortunately does not always initialize that 4-byte hole. Fix it by using
memset() instead.

Cc: stable@vger.kernel.org
Fixes: f037590fff30 ("rds: fix a leak of kernel memory")
Fixes: bdbe6fbc6a2f ("RDS: recv.c")
Suggested-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Peilin Ye <yepeilin.cs@gmail.com>
Acked-by: Santosh Shilimkar <santosh.shilimkar@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 net/rds/recv.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

--- a/net/rds/recv.c
+++ b/net/rds/recv.c
@@ -453,12 +453,13 @@ static int rds_still_queued(struct rds_s
 int rds_notify_queue_get(struct rds_sock *rs, struct msghdr *msghdr)
 {
 	struct rds_notifier *notifier;
-	struct rds_rdma_notify cmsg = { 0 }; /* fill holes with zero */
+	struct rds_rdma_notify cmsg;
 	unsigned int count = 0, max_messages = ~0U;
 	unsigned long flags;
 	LIST_HEAD(copy);
 	int err = 0;
 
+	memset(&cmsg, 0, sizeof(cmsg));	/* fill holes with zero */
 
 	/* put_cmsg copies to user space and thus may sleep. We can't do this
 	 * with rs_lock held, so first grab as many notifications as we can stuff

[PATCH 4.14 25/51] xfs: fix missed wakeup on l_flush_wait

[Greg Kroah-Hartman]

From: Rik van Riel <riel@surriel.com>

commit cdea5459ce263fbc963657a7736762ae897a8ae6 upstream.

The code in xlog_wait uses the spinlock to make adding the task to
the wait queue, and setting the task state to UNINTERRUPTIBLE atomic
with respect to the waker.

Doing the wakeup after releasing the spinlock opens up the following
race condition:

Task 1					task 2
add task to wait queue
					wake up task
set task state to UNINTERRUPTIBLE

This issue was found through code inspection as a result of kworkers
being observed stuck in UNINTERRUPTIBLE state with an empty
wait queue. It is rare and largely unreproducable.

Simply moving the spin_unlock to after the wake_up_all results
in the waker not being able to see a task on the waitqueue before
it has set its state to UNINTERRUPTIBLE.

This bug dates back to the conversion of this code to generic
waitqueue infrastructure from a counting semaphore back in 2008
which didn't place the wakeups consistently w.r.t. to the relevant
spin locks.

[dchinner: Also fix a similar issue in the shutdown path on
xc_commit_wait. Update commit log with more details of the issue.]

Fixes: d748c62367eb ("[XFS] Convert l_flushsema to a sv_t")
Reported-by: Chris Mason <clm@fb.com>
Signed-off-by: Rik van Riel <riel@surriel.com>
Signed-off-by: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Cc: stable@vger.kernel.org # 4.9.x-4.19.x
[modified for contextual change near xlog_state_do_callback()]
Signed-off-by: Samuel Mendoza-Jonas <samjonas@amazon.com>
Reviewed-by: Frank van der Linden <fllinden@amazon.com>
Reviewed-by: Suraj Jitindar Singh <surajjs@amazon.com>
Reviewed-by: Benjamin Herrenschmidt <benh@amazon.com>
Reviewed-by: Anchal Agarwal <anchalag@amazon.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 fs/xfs/xfs_log.c |    9 ++++-----
 1 file changed, 4 insertions(+), 5 deletions(-)

--- a/fs/xfs/xfs_log.c
+++ b/fs/xfs/xfs_log.c
@@ -2684,7 +2684,6 @@ xlog_state_do_callback(
 	int		   funcdidcallbacks; /* flag: function did callbacks */
 	int		   repeats;	/* for issuing console warnings if
 					 * looping too many times */
-	int		   wake = 0;
 
 	spin_lock(&log->l_icloglock);
 	first_iclog = iclog = log->l_iclog;
@@ -2886,11 +2885,9 @@ xlog_state_do_callback(
 #endif
 
 	if (log->l_iclog->ic_state & (XLOG_STATE_ACTIVE|XLOG_STATE_IOERROR))
-		wake = 1;
-	spin_unlock(&log->l_icloglock);
-
-	if (wake)
 		wake_up_all(&log->l_flush_wait);
+
+	spin_unlock(&log->l_icloglock);
 }
 
 
@@ -4052,7 +4049,9 @@ xfs_log_force_umount(
 	 * item committed callback functions will do this again under lock to
 	 * avoid races.
 	 */
+	spin_lock(&log->l_cilp->xc_push_lock);
 	wake_up_all(&log->l_cilp->xc_commit_wait);
+	spin_unlock(&log->l_cilp->xc_push_lock);
 	xlog_state_do_callback(log, XFS_LI_ABORTED, NULL);
 
 #ifdef XFSERRORDEBUG

[PATCH 4.14 26/51] net/x25: Fix x25_neigh refcnt leak when x25 disconnect

[Greg Kroah-Hartman]

From: Xiyu Yang <xiyuyang19@fudan.edu.cn>

commit 4becb7ee5b3d2829ed7b9261a245a77d5b7de902 upstream.

x25_connect() invokes x25_get_neigh(), which returns a reference of the
specified x25_neigh object to "x25->neighbour" with increased refcnt.

When x25 connect success and returns, the reference still be hold by
"x25->neighbour", so the refcount should be decreased in
x25_disconnect() to keep refcount balanced.

The reference counting issue happens in x25_disconnect(), which forgets
to decrease the refcnt increased by x25_get_neigh() in x25_connect(),
causing a refcnt leak.

Fix this issue by calling x25_neigh_put() before x25_disconnect()
returns.

Signed-off-by: Xiyu Yang <xiyuyang19@fudan.edu.cn>
Signed-off-by: Xin Tan <tanxin.ctf@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 net/x25/x25_subr.c |    4 ++++
 1 file changed, 4 insertions(+)

--- a/net/x25/x25_subr.c
+++ b/net/x25/x25_subr.c
@@ -363,6 +363,10 @@ void x25_disconnect(struct sock *sk, int
 		sk->sk_state_change(sk);
 		sock_set_flag(sk, SOCK_DEAD);
 	}
+	read_lock_bh(&x25_list_lock);
+	x25_neigh_put(x25->neighbour);
+	x25->neighbour = NULL;
+	read_unlock_bh(&x25_list_lock);
 }
 
 /*

[PATCH 4.14 27/51] net/x25: Fix null-ptr-deref in x25_disconnect

[Greg Kroah-Hartman]

From: YueHaibing <yuehaibing@huawei.com>

commit 8999dc89497ab1c80d0718828e838c7cd5f6bffe upstream.

We should check null before do x25_neigh_put in x25_disconnect,
otherwise may cause null-ptr-deref like this:

 #include <sys/socket.h>
 #include <linux/x25.h>

 int main() {
    int sck_x25;
    sck_x25 = socket(AF_X25, SOCK_SEQPACKET, 0);
    close(sck_x25);
    return 0;
 }

BUG: kernel NULL pointer dereference, address: 00000000000000d8
CPU: 0 PID: 4817 Comm: t2 Not tainted 5.7.0-rc3+ #159
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.9.3-
RIP: 0010:x25_disconnect+0x91/0xe0
Call Trace:
 x25_release+0x18a/0x1b0
 __sock_release+0x3d/0xc0
 sock_close+0x13/0x20
 __fput+0x107/0x270
 ____fput+0x9/0x10
 task_work_run+0x6d/0xb0
 exit_to_usermode_loop+0x102/0x110
 do_syscall_64+0x23c/0x260
 entry_SYSCALL_64_after_hwframe+0x49/0xb3

Reported-by: syzbot+6db548b615e5aeefdce2@syzkaller.appspotmail.com
Fixes: 4becb7ee5b3d ("net/x25: Fix x25_neigh refcnt leak when x25 disconnect")
Signed-off-by: YueHaibing <yuehaibing@huawei.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 net/x25/x25_subr.c |   10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

--- a/net/x25/x25_subr.c
+++ b/net/x25/x25_subr.c
@@ -363,10 +363,12 @@ void x25_disconnect(struct sock *sk, int
 		sk->sk_state_change(sk);
 		sock_set_flag(sk, SOCK_DEAD);
 	}
-	read_lock_bh(&x25_list_lock);
-	x25_neigh_put(x25->neighbour);
-	x25->neighbour = NULL;
-	read_unlock_bh(&x25_list_lock);
+	if (x25->neighbour) {
+		read_lock_bh(&x25_list_lock);
+		x25_neigh_put(x25->neighbour);
+		x25->neighbour = NULL;
+		read_unlock_bh(&x25_list_lock);
+	}
 }
 
 /*

[PATCH 4.14 28/51] selftests/net: rxtimestamp: fix clang issues for target arch PowerPC

[Greg Kroah-Hartman]

From: Tanner Love <tannerlove@google.com>

[ Upstream commit 955cbe91bcf782c09afe369c95a20f0a4b6dcc3c ]

The signedness of char is implementation-dependent. Some systems
(including PowerPC and ARM) use unsigned char. Clang 9 threw:
warning: result of comparison of constant -1 with expression of type \
'char' is always true [-Wtautological-constant-out-of-range-compare]
                                  &arg_index)) != -1) {

Tested: make -C tools/testing/selftests TARGETS="net" run_tests

Fixes: 16e781224198 ("selftests/net: Add a test to validate behavior of rx timestamps")
Signed-off-by: Tanner Love <tannerlove@google.com>
Acked-by: Willem de Bruijn <willemb@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 tools/testing/selftests/networking/timestamping/rxtimestamp.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/tools/testing/selftests/networking/timestamping/rxtimestamp.c b/tools/testing/selftests/networking/timestamping/rxtimestamp.c
index 7a573fb4c1c4e..c6428f1ac22fb 100644
--- a/tools/testing/selftests/networking/timestamping/rxtimestamp.c
+++ b/tools/testing/selftests/networking/timestamping/rxtimestamp.c
@@ -328,8 +328,7 @@ int main(int argc, char **argv)
 	bool all_tests = true;
 	int arg_index = 0;
 	int failures = 0;
-	int s, t;
-	char opt;
+	int s, t, opt;
 
 	while ((opt = getopt_long(argc, argv, "", long_options,
 				  &arg_index)) != -1) {
-- 
2.25.1

[PATCH 4.14 29/51] sh: Fix validation of system call number

[Greg Kroah-Hartman]

From: Michael Karcher <kernel@mkarcher.dialup.fu-berlin.de>

[ Upstream commit 04a8a3d0a73f51c7c2da84f494db7ec1df230e69 ]

The slow path for traced system call entries accessed a wrong memory
location to get the number of the maximum allowed system call number.
Renumber the numbered "local" label for the correct location to avoid
collisions with actual local labels.

Signed-off-by: Michael Karcher <kernel@mkarcher.dialup.fu-berlin.de>
Tested-by: John Paul Adrian Glaubitz <glaubitz@physik.fu-berlin.de>
Fixes: f3a8308864f920d2 ("sh: Add a few missing irqflags tracing markers.")
Signed-off-by: Rich Felker <dalias@libc.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 arch/sh/kernel/entry-common.S | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/arch/sh/kernel/entry-common.S b/arch/sh/kernel/entry-common.S
index 28cc61216b649..ed5b758c650d7 100644
--- a/arch/sh/kernel/entry-common.S
+++ b/arch/sh/kernel/entry-common.S
@@ -203,7 +203,7 @@ syscall_trace_entry:
 	mov.l	@(OFF_R7,r15), r7   ! arg3
 	mov.l	@(OFF_R3,r15), r3   ! syscall_nr
 	!
-	mov.l	2f, r10			! Number of syscalls
+	mov.l	6f, r10			! Number of syscalls
 	cmp/hs	r10, r3
 	bf	syscall_call
 	mov	#-ENOSYS, r0
@@ -357,7 +357,7 @@ ENTRY(system_call)
 	tst	r9, r8
 	bf	syscall_trace_entry
 	!
-	mov.l	2f, r8			! Number of syscalls
+	mov.l	6f, r8			! Number of syscalls
 	cmp/hs	r8, r3
 	bt	syscall_badsys
 	!
@@ -396,7 +396,7 @@ syscall_exit:
 #if !defined(CONFIG_CPU_SH2)
 1:	.long	TRA
 #endif
-2:	.long	NR_syscalls
+6:	.long	NR_syscalls
 3:	.long	sys_call_table
 7:	.long	do_syscall_trace_enter
 8:	.long	do_syscall_trace_leave
-- 
2.25.1

[PATCH 4.14 30/51] net: lan78xx: add missing endpoint sanity check

[Greg Kroah-Hartman]

From: Johan Hovold <johan@kernel.org>

[ Upstream commit 8d8e95fd6d69d774013f51e5f2ee10c6e6d1fc14 ]

Add the missing endpoint sanity check to prevent a NULL-pointer
dereference should a malicious device lack the expected endpoints.

Note that the driver has a broken endpoint-lookup helper,
lan78xx_get_endpoints(), which can end up accepting interfaces in an
altsetting without endpoints as long as *some* altsetting has a bulk-in
and a bulk-out endpoint.

Fixes: 55d7de9de6c3 ("Microchip's LAN7800 family USB 2/3 to 10/100/1000 Ethernet device driver")
Cc: Woojung.Huh@microchip.com <Woojung.Huh@microchip.com>
Signed-off-by: Johan Hovold <johan@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/net/usb/lan78xx.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/net/usb/lan78xx.c b/drivers/net/usb/lan78xx.c
index b179a96ea08ca..3be92fff89b1a 100644
--- a/drivers/net/usb/lan78xx.c
+++ b/drivers/net/usb/lan78xx.c
@@ -3629,6 +3629,11 @@ static int lan78xx_probe(struct usb_interface *intf,
 	netdev->max_mtu = MAX_SINGLE_PACKET_SIZE;
 	netif_set_gso_max_size(netdev, MAX_SINGLE_PACKET_SIZE - MAX_HEADER);
 
+	if (intf->cur_altsetting->desc.bNumEndpoints < 3) {
+		ret = -ENODEV;
+		goto out3;
+	}
+
 	dev->ep_blkin = (intf->cur_altsetting)->endpoint + 0;
 	dev->ep_blkout = (intf->cur_altsetting)->endpoint + 1;
 	dev->ep_intr = (intf->cur_altsetting)->endpoint + 2;
-- 
2.25.1

[PATCH 4.14 31/51] net: lan78xx: fix transfer-buffer memory leak

[Greg Kroah-Hartman]

From: Johan Hovold <johan@kernel.org>

[ Upstream commit 63634aa679ba8b5e306ad0727120309ae6ba8a8e ]

The interrupt URB transfer-buffer was never freed on disconnect or after
probe errors.

Fixes: 55d7de9de6c3 ("Microchip's LAN7800 family USB 2/3 to 10/100/1000 Ethernet device driver")
Cc: Woojung.Huh@microchip.com <Woojung.Huh@microchip.com>
Signed-off-by: Johan Hovold <johan@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/net/usb/lan78xx.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/net/usb/lan78xx.c b/drivers/net/usb/lan78xx.c
index 3be92fff89b1a..895f307979c82 100644
--- a/drivers/net/usb/lan78xx.c
+++ b/drivers/net/usb/lan78xx.c
@@ -3658,6 +3658,7 @@ static int lan78xx_probe(struct usb_interface *intf,
 			usb_fill_int_urb(dev->urb_intr, dev->udev,
 					 dev->pipe_intr, buf, maxp,
 					 intr_complete, dev, period);
+			dev->urb_intr->transfer_flags |= URB_FREE_BUFFER;
 		}
 	}
 
-- 
2.25.1

[PATCH 4.14 32/51] mlx4: disable device on shutdown

[Greg Kroah-Hartman]

From: Jakub Kicinski <kuba@kernel.org>

[ Upstream commit 3cab8c65525920f00d8f4997b3e9bb73aecb3a8e ]

It appears that not disabling a PCI device on .shutdown may lead to
a Hardware Error with particular (perhaps buggy) BIOS versions:

    mlx4_en: eth0: Close port called
    mlx4_en 0000:04:00.0: removed PHC
    reboot: Restarting system
    {1}[Hardware Error]: Hardware error from APEI Generic Hardware Error Source: 1
    {1}[Hardware Error]: event severity: fatal
    {1}[Hardware Error]:  Error 0, type: fatal
    {1}[Hardware Error]:   section_type: PCIe error
    {1}[Hardware Error]:   port_type: 4, root port
    {1}[Hardware Error]:   version: 1.16
    {1}[Hardware Error]:   command: 0x4010, status: 0x0143
    {1}[Hardware Error]:   device_id: 0000:00:02.2
    {1}[Hardware Error]:   slot: 0
    {1}[Hardware Error]:   secondary_bus: 0x04
    {1}[Hardware Error]:   vendor_id: 0x8086, device_id: 0x2f06
    {1}[Hardware Error]:   class_code: 000604
    {1}[Hardware Error]:   bridge: secondary_status: 0x2000, control: 0x0003
    {1}[Hardware Error]:   aer_uncor_status: 0x00100000, aer_uncor_mask: 0x00000000
    {1}[Hardware Error]:   aer_uncor_severity: 0x00062030
    {1}[Hardware Error]:   TLP Header: 40000018 040000ff 791f4080 00000000
[hw error repeats]
    Kernel panic - not syncing: Fatal hardware error!
    CPU: 0 PID: 2189 Comm: reboot Kdump: loaded Not tainted 5.6.x-blabla #1
    Hardware name: HP ProLiant DL380 Gen9/ProLiant DL380 Gen9, BIOS P89 05/05/2017

Fix the mlx4 driver.

This is a very similar problem to what had been fixed in:
commit 0d98ba8d70b0 ("scsi: hpsa: disable device during shutdown")
to address https://bugzilla.kernel.org/show_bug.cgi?id=199779.

Fixes: 2ba5fbd62b25 ("net/mlx4_core: Handle AER flow properly")
Reported-by: Jake Lawrence <lawja@fb.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Reviewed-by: Saeed Mahameed <saeedm@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/net/ethernet/mellanox/mlx4/main.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/net/ethernet/mellanox/mlx4/main.c b/drivers/net/ethernet/mellanox/mlx4/main.c
index cf9011bb6e0f1..c6660b61e8361 100644
--- a/drivers/net/ethernet/mellanox/mlx4/main.c
+++ b/drivers/net/ethernet/mellanox/mlx4/main.c
@@ -4190,12 +4190,14 @@ end:
 static void mlx4_shutdown(struct pci_dev *pdev)
 {
 	struct mlx4_dev_persistent *persist = pci_get_drvdata(pdev);
+	struct mlx4_dev *dev = persist->dev;
 
 	mlx4_info(persist->dev, "mlx4_shutdown was called\n");
 	mutex_lock(&persist->interface_state_mutex);
 	if (persist->interface_state & MLX4_INTERFACE_STATE_UP)
 		mlx4_unload_one(pdev);
 	mutex_unlock(&persist->interface_state_mutex);
+	mlx4_pci_disable_device(dev);
 }
 
 static const struct pci_error_handlers mlx4_err_handler = {
-- 
2.25.1

[PATCH 4.14 33/51] mlxsw: core: Increase scope of RCU read-side critical section

[Greg Kroah-Hartman]

From: Ido Schimmel <idosch@mellanox.com>

[ Upstream commit 7d8e8f3433dc8d1dc87c1aabe73a154978fb4c4d ]

The lifetime of the Rx listener item ('rxl_item') is managed using RCU,
but is dereferenced outside of RCU read-side critical section, which can
lead to a use-after-free.

Fix this by increasing the scope of the RCU read-side critical section.

Fixes: 93c1edb27f9e ("mlxsw: Introduce Mellanox switch driver core")
Signed-off-by: Ido Schimmel <idosch@mellanox.com>
Reviewed-by: Jiri Pirko <jiri@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/net/ethernet/mellanox/mlxsw/core.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/mellanox/mlxsw/core.c b/drivers/net/ethernet/mellanox/mlxsw/core.c
index 96f9f267d16d4..a2161b1409047 100644
--- a/drivers/net/ethernet/mellanox/mlxsw/core.c
+++ b/drivers/net/ethernet/mellanox/mlxsw/core.c
@@ -1574,11 +1574,13 @@ void mlxsw_core_skb_receive(struct mlxsw_core *mlxsw_core, struct sk_buff *skb,
 			break;
 		}
 	}
-	rcu_read_unlock();
-	if (!found)
+	if (!found) {
+		rcu_read_unlock();
 		goto drop;
+	}
 
 	rxl->func(skb, local_port, rxl_item->priv);
+	rcu_read_unlock();
 	return;
 
 drop:
-- 
2.25.1

[PATCH 4.14 34/51] mlxsw: core: Free EMAD transactions using kfree_rcu()

[Greg Kroah-Hartman]

From: Ido Schimmel <idosch@mellanox.com>

[ Upstream commit 3c8ce24b037648a5a15b85888b259a74b05ff97d ]

The lifetime of EMAD transactions (i.e., 'struct mlxsw_reg_trans') is
managed using RCU. They are freed using kfree_rcu() once the transaction
ends.

However, in case the transaction failed it is freed immediately after being
removed from the active transactions list. This is problematic because it is
still possible for a different CPU to dereference the transaction from an RCU
read-side critical section while traversing the active transaction list in
mlxsw_emad_rx_listener_func(). In which case, a use-after-free is triggered
[1].

Fix this by freeing the transaction after a grace period by calling
kfree_rcu().

[1]
BUG: KASAN: use-after-free in mlxsw_emad_rx_listener_func+0x969/0xac0 drivers/net/ethernet/mellanox/mlxsw/core.c:671
Read of size 8 at addr ffff88800b7964e8 by task syz-executor.2/2881

CPU: 0 PID: 2881 Comm: syz-executor.2 Not tainted 5.8.0-rc4+ #44
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.12.1-0-ga5cab58e9a3f-prebuilt.qemu.org 04/01/2014
Call Trace:
 <IRQ>
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0xf6/0x16e lib/dump_stack.c:118
 print_address_description.constprop.0+0x1c/0x250 mm/kasan/report.c:383
 __kasan_report mm/kasan/report.c:513 [inline]
 kasan_report.cold+0x1f/0x37 mm/kasan/report.c:530
 mlxsw_emad_rx_listener_func+0x969/0xac0 drivers/net/ethernet/mellanox/mlxsw/core.c:671
 mlxsw_core_skb_receive+0x571/0x700 drivers/net/ethernet/mellanox/mlxsw/core.c:2061
 mlxsw_pci_cqe_rdq_handle drivers/net/ethernet/mellanox/mlxsw/pci.c:595 [inline]
 mlxsw_pci_cq_tasklet+0x12a6/0x2520 drivers/net/ethernet/mellanox/mlxsw/pci.c:651
 tasklet_action_common.isra.0+0x13f/0x3e0 kernel/softirq.c:550
 __do_softirq+0x223/0x964 kernel/softirq.c:292
 asm_call_on_stack+0x12/0x20 arch/x86/entry/entry_64.S:711
 </IRQ>
 __run_on_irqstack arch/x86/include/asm/irq_stack.h:22 [inline]
 run_on_irqstack_cond arch/x86/include/asm/irq_stack.h:48 [inline]
 do_softirq_own_stack+0x109/0x140 arch/x86/kernel/irq_64.c:77
 invoke_softirq kernel/softirq.c:387 [inline]
 __irq_exit_rcu kernel/softirq.c:417 [inline]
 irq_exit_rcu+0x16f/0x1a0 kernel/softirq.c:429
 sysvec_apic_timer_interrupt+0x4e/0xd0 arch/x86/kernel/apic/apic.c:1091
 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:587
RIP: 0010:arch_local_irq_restore arch/x86/include/asm/irqflags.h:85 [inline]
RIP: 0010:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:160 [inline]
RIP: 0010:_raw_spin_unlock_irqrestore+0x3b/0x40 kernel/locking/spinlock.c:191
Code: e8 2a c3 f4 fc 48 89 ef e8 12 96 f5 fc f6 c7 02 75 11 53 9d e8 d6 db 11 fd 65 ff 0d 1f 21 b3 56 5b 5d c3 e8 a7 d7 11 fd 53 9d <eb> ed 0f 1f 00 55 48 89 fd 65 ff 05 05 21 b3 56 ff 74 24 08 48 8d
RSP: 0018:ffff8880446ffd80 EFLAGS: 00000286
RAX: 0000000000000006 RBX: 0000000000000286 RCX: 0000000000000006
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffffa94ecea9
RBP: ffff888012934408 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000001 R11: fffffbfff57be301 R12: 1ffff110088dffc1
R13: ffff888037b817c0 R14: ffff88802442415a R15: ffff888024424000
 __do_sys_perf_event_open+0x1b5d/0x2bd0 kernel/events/core.c:11874
 do_syscall_64+0x56/0xa0 arch/x86/entry/common.c:384
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x473dbd
Code: Bad RIP value.
RSP: 002b:00007f21e5e9cc28 EFLAGS: 00000246 ORIG_RAX: 000000000000012a
RAX: ffffffffffffffda RBX: 000000000057bf00 RCX: 0000000000473dbd
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000020000040
RBP: 000000000057bf00 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000003 R11: 0000000000000246 R12: 000000000057bf0c
R13: 00007ffd0493503f R14: 00000000004d0f46 R15: 00007f21e5e9cd80

Allocated by task 871:
 save_stack+0x1b/0x40 mm/kasan/common.c:48
 set_track mm/kasan/common.c:56 [inline]
 __kasan_kmalloc mm/kasan/common.c:494 [inline]
 __kasan_kmalloc.constprop.0+0xc2/0xd0 mm/kasan/common.c:467
 kmalloc include/linux/slab.h:555 [inline]
 kzalloc include/linux/slab.h:669 [inline]
 mlxsw_core_reg_access_emad+0x70/0x1410 drivers/net/ethernet/mellanox/mlxsw/core.c:1812
 mlxsw_core_reg_access+0xeb/0x540 drivers/net/ethernet/mellanox/mlxsw/core.c:1991
 mlxsw_sp_port_get_hw_xstats+0x335/0x7e0 drivers/net/ethernet/mellanox/mlxsw/spectrum.c:1130
 update_stats_cache+0xf4/0x140 drivers/net/ethernet/mellanox/mlxsw/spectrum.c:1173
 process_one_work+0xa3e/0x17a0 kernel/workqueue.c:2269
 worker_thread+0x9e/0x1050 kernel/workqueue.c:2415
 kthread+0x355/0x470 kernel/kthread.c:291
 ret_from_fork+0x22/0x30 arch/x86/entry/entry_64.S:293

Freed by task 871:
 save_stack+0x1b/0x40 mm/kasan/common.c:48
 set_track mm/kasan/common.c:56 [inline]
 kasan_set_free_info mm/kasan/common.c:316 [inline]
 __kasan_slab_free+0x12c/0x170 mm/kasan/common.c:455
 slab_free_hook mm/slub.c:1474 [inline]
 slab_free_freelist_hook mm/slub.c:1507 [inline]
 slab_free mm/slub.c:3072 [inline]
 kfree+0xe6/0x320 mm/slub.c:4052
 mlxsw_core_reg_access_emad+0xd45/0x1410 drivers/net/ethernet/mellanox/mlxsw/core.c:1819
 mlxsw_core_reg_access+0xeb/0x540 drivers/net/ethernet/mellanox/mlxsw/core.c:1991
 mlxsw_sp_port_get_hw_xstats+0x335/0x7e0 drivers/net/ethernet/mellanox/mlxsw/spectrum.c:1130
 update_stats_cache+0xf4/0x140 drivers/net/ethernet/mellanox/mlxsw/spectrum.c:1173
 process_one_work+0xa3e/0x17a0 kernel/workqueue.c:2269
 worker_thread+0x9e/0x1050 kernel/workqueue.c:2415
 kthread+0x355/0x470 kernel/kthread.c:291
 ret_from_fork+0x22/0x30 arch/x86/entry/entry_64.S:293

The buggy address belongs to the object at ffff88800b796400
 which belongs to the cache kmalloc-512 of size 512
The buggy address is located 232 bytes inside of
 512-byte region [ffff88800b796400, ffff88800b796600)
The buggy address belongs to the page:
page:ffffea00002de500 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 head:ffffea00002de500 order:2 compound_mapcount:0 compound_pincount:0
flags: 0x100000000010200(slab|head)
raw: 0100000000010200 dead000000000100 dead000000000122 ffff88806c402500
raw: 0000000000000000 0000000000100010 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff88800b796380: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff88800b796400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff88800b796480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                                          ^
 ffff88800b796500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff88800b796580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb

Fixes: caf7297e7ab5 ("mlxsw: core: Introduce support for asynchronous EMAD register access")
Signed-off-by: Ido Schimmel <idosch@mellanox.com>
Reviewed-by: Jiri Pirko <jiri@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/net/ethernet/mellanox/mlxsw/core.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/mellanox/mlxsw/core.c b/drivers/net/ethernet/mellanox/mlxsw/core.c
index a2161b1409047..dc12ab33afffb 100644
--- a/drivers/net/ethernet/mellanox/mlxsw/core.c
+++ b/drivers/net/ethernet/mellanox/mlxsw/core.c
@@ -1361,7 +1361,7 @@ static int mlxsw_core_reg_access_emad(struct mlxsw_core *mlxsw_core,
 	err = mlxsw_emad_reg_access(mlxsw_core, reg, payload, type, trans,
 				    bulk_list, cb, cb_priv, tid);
 	if (err) {
-		kfree(trans);
+		kfree_rcu(trans, rcu);
 		return err;
 	}
 	return 0;
-- 
2.25.1

[PATCH 4.14 35/51] ibmvnic: Fix IRQ mapping disposal in error path

[Greg Kroah-Hartman]

From: Thomas Falcon <tlfalcon@linux.ibm.com>

[ Upstream commit 27a2145d6f826d1fad9de06ac541b1016ced3427 ]

RX queue IRQ mappings are disposed in both the TX IRQ and RX IRQ
error paths. Fix this and dispose of TX IRQ mappings correctly in
case of an error.

Fixes: ea22d51a7831 ("ibmvnic: simplify and improve driver probe function")
Signed-off-by: Thomas Falcon <tlfalcon@linux.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/net/ethernet/ibm/ibmvnic.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/ibm/ibmvnic.c b/drivers/net/ethernet/ibm/ibmvnic.c
index 85c11dafb4cd9..8b8a0c4fbc993 100644
--- a/drivers/net/ethernet/ibm/ibmvnic.c
+++ b/drivers/net/ethernet/ibm/ibmvnic.c
@@ -2324,7 +2324,7 @@ req_rx_irq_failed:
 req_tx_irq_failed:
 	for (j = 0; j < i; j++) {
 		free_irq(adapter->tx_scrq[j]->irq, adapter->tx_scrq[j]);
-		irq_dispose_mapping(adapter->rx_scrq[j]->irq);
+		irq_dispose_mapping(adapter->tx_scrq[j]->irq);
 	}
 	release_sub_crqs(adapter);
 	return rc;
-- 
2.25.1

[PATCH 4.14 36/51] bpf: Fix map leak in HASH_OF_MAPS map

[Greg Kroah-Hartman]

From: Andrii Nakryiko <andriin@fb.com>

[ Upstream commit 1d4e1eab456e1ee92a94987499b211db05f900ea ]

Fix HASH_OF_MAPS bug of not putting inner map pointer on bpf_map_elem_update()
operation. This is due to per-cpu extra_elems optimization, which bypassed
free_htab_elem() logic doing proper clean ups. Make sure that inner map is put
properly in optimized case as well.

Fixes: 8c290e60fa2a ("bpf: fix hashmap extra_elems logic")
Signed-off-by: Andrii Nakryiko <andriin@fb.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Song Liu <songliubraving@fb.com>
Link: https://lore.kernel.org/bpf/20200729040913.2815687-1-andriin@fb.com
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 kernel/bpf/hashtab.c | 12 +++++++++---
 1 file changed, 9 insertions(+), 3 deletions(-)

diff --git a/kernel/bpf/hashtab.c b/kernel/bpf/hashtab.c
index 505e69854eb88..6cc090d015f66 100644
--- a/kernel/bpf/hashtab.c
+++ b/kernel/bpf/hashtab.c
@@ -656,15 +656,20 @@ static void htab_elem_free_rcu(struct rcu_head *head)
 	preempt_enable();
 }
 
-static void free_htab_elem(struct bpf_htab *htab, struct htab_elem *l)
+static void htab_put_fd_value(struct bpf_htab *htab, struct htab_elem *l)
 {
 	struct bpf_map *map = &htab->map;
+	void *ptr;
 
 	if (map->ops->map_fd_put_ptr) {
-		void *ptr = fd_htab_map_get_ptr(map, l);
-
+		ptr = fd_htab_map_get_ptr(map, l);
 		map->ops->map_fd_put_ptr(ptr);
 	}
+}
+
+static void free_htab_elem(struct bpf_htab *htab, struct htab_elem *l)
+{
+	htab_put_fd_value(htab, l);
 
 	if (htab_is_prealloc(htab)) {
 		__pcpu_freelist_push(&htab->freelist, &l->fnode);
@@ -725,6 +730,7 @@ static struct htab_elem *alloc_htab_elem(struct bpf_htab *htab, void *key,
 			 */
 			pl_new = this_cpu_ptr(htab->extra_elems);
 			l_new = *pl_new;
+			htab_put_fd_value(htab, old_elem);
 			*pl_new = old_elem;
 		} else {
 			struct pcpu_freelist_node *l;
-- 
2.25.1

[PATCH 4.14 37/51] mac80211: mesh: Free ie data when leaving mesh

[Greg Kroah-Hartman]

From: Remi Pommarel <repk@triplefau.lt>

[ Upstream commit 6a01afcf8468d3ca2bd8bbb27503f60dcf643b20 ]

At ieee80211_join_mesh() some ie data could have been allocated (see
copy_mesh_setup()) and need to be cleaned up when leaving the mesh.

This fixes the following kmemleak report:

unreferenced object 0xffff0000116bc600 (size 128):
  comm "wpa_supplicant", pid 608, jiffies 4294898983 (age 293.484s)
  hex dump (first 32 bytes):
    30 14 01 00 00 0f ac 04 01 00 00 0f ac 04 01 00  0...............
    00 0f ac 08 00 00 00 00 c4 65 40 00 00 00 00 00  .........e@.....
  backtrace:
    [<00000000bebe439d>] __kmalloc_track_caller+0x1c0/0x330
    [<00000000a349dbe1>] kmemdup+0x28/0x50
    [<0000000075d69baa>] ieee80211_join_mesh+0x6c/0x3b8 [mac80211]
    [<00000000683bb98b>] __cfg80211_join_mesh+0x1e8/0x4f0 [cfg80211]
    [<0000000072cb507f>] nl80211_join_mesh+0x520/0x6b8 [cfg80211]
    [<0000000077e9bcf9>] genl_family_rcv_msg+0x374/0x680
    [<00000000b1bd936d>] genl_rcv_msg+0x78/0x108
    [<0000000022c53788>] netlink_rcv_skb+0xb0/0x1c0
    [<0000000011af8ec9>] genl_rcv+0x34/0x48
    [<0000000069e41f53>] netlink_unicast+0x268/0x2e8
    [<00000000a7517316>] netlink_sendmsg+0x320/0x4c0
    [<0000000069cba205>] ____sys_sendmsg+0x354/0x3a0
    [<00000000e06bab0f>] ___sys_sendmsg+0xd8/0x120
    [<0000000037340728>] __sys_sendmsg+0xa4/0xf8
    [<000000004fed9776>] __arm64_sys_sendmsg+0x44/0x58
    [<000000001c1e5647>] el0_svc_handler+0xd0/0x1a0

Fixes: c80d545da3f7 (mac80211: Let userspace enable and configure vendor specific path selection.)
Signed-off-by: Remi Pommarel <repk@triplefau.lt>
Link: https://lore.kernel.org/r/20200704135007.27292-1-repk@triplefau.lt
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 net/mac80211/cfg.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/net/mac80211/cfg.c b/net/mac80211/cfg.c
index b1484b8316e87..c883cb67b7311 100644
--- a/net/mac80211/cfg.c
+++ b/net/mac80211/cfg.c
@@ -1997,6 +1997,7 @@ static int ieee80211_leave_mesh(struct wiphy *wiphy, struct net_device *dev)
 	ieee80211_stop_mesh(sdata);
 	mutex_lock(&sdata->local->mtx);
 	ieee80211_vif_release_channel(sdata);
+	kfree(sdata->u.mesh.ie);
 	mutex_unlock(&sdata->local->mtx);
 
 	return 0;
-- 
2.25.1

[PATCH 4.14 38/51] mac80211: mesh: Free pending skb when destroying a mpath

[Greg Kroah-Hartman]

From: Remi Pommarel <repk@triplefau.lt>

[ Upstream commit 5e43540c2af0a0c0a18e39579b1ad49541f87506 ]

A mpath object can hold reference on a list of skb that are waiting for
mpath resolution to be sent. When destroying a mpath this skb list
should be cleaned up in order to not leak memory.

Fixing that kind of leak:

unreferenced object 0xffff0000181c9300 (size 1088):
  comm "openvpn", pid 1782, jiffies 4295071698 (age 80.416s)
  hex dump (first 32 bytes):
    00 00 00 00 00 00 00 00 f9 80 36 00 00 00 00 00  ..........6.....
    02 00 07 40 00 00 00 00 00 00 00 00 00 00 00 00  ...@............
  backtrace:
    [<000000004bc6a443>] kmem_cache_alloc+0x1a4/0x2f0
    [<000000002caaef13>] sk_prot_alloc.isra.39+0x34/0x178
    [<00000000ceeaa916>] sk_alloc+0x34/0x228
    [<00000000ca1f1d04>] inet_create+0x198/0x518
    [<0000000035626b1c>] __sock_create+0x134/0x328
    [<00000000a12b3a87>] __sys_socket+0xb0/0x158
    [<00000000ff859f23>] __arm64_sys_socket+0x40/0x58
    [<00000000263486ec>] el0_svc_handler+0xd0/0x1a0
    [<0000000005b5157d>] el0_svc+0x8/0xc
unreferenced object 0xffff000012973a40 (size 216):
  comm "openvpn", pid 1782, jiffies 4295082137 (age 38.660s)
  hex dump (first 32 bytes):
    00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
    00 c0 06 16 00 00 ff ff 00 93 1c 18 00 00 ff ff  ................
  backtrace:
    [<000000004bc6a443>] kmem_cache_alloc+0x1a4/0x2f0
    [<0000000023c8c8f9>] __alloc_skb+0xc0/0x2b8
    [<000000007ad950bb>] alloc_skb_with_frags+0x60/0x320
    [<00000000ef90023a>] sock_alloc_send_pskb+0x388/0x3c0
    [<00000000104fb1a3>] sock_alloc_send_skb+0x1c/0x28
    [<000000006919d2dd>] __ip_append_data+0xba4/0x11f0
    [<0000000083477587>] ip_make_skb+0x14c/0x1a8
    [<0000000024f3d592>] udp_sendmsg+0xaf0/0xcf0
    [<000000005aabe255>] inet_sendmsg+0x5c/0x80
    [<000000008651ea08>] __sys_sendto+0x15c/0x218
    [<000000003505c99b>] __arm64_sys_sendto+0x74/0x90
    [<00000000263486ec>] el0_svc_handler+0xd0/0x1a0
    [<0000000005b5157d>] el0_svc+0x8/0xc

Fixes: 2bdaf386f99c (mac80211: mesh: move path tables into if_mesh)
Signed-off-by: Remi Pommarel <repk@triplefau.lt>
Link: https://lore.kernel.org/r/20200704135419.27703-1-repk@triplefau.lt
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 net/mac80211/mesh_pathtbl.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/net/mac80211/mesh_pathtbl.c b/net/mac80211/mesh_pathtbl.c
index 1300220912051..933f26e2ff8be 100644
--- a/net/mac80211/mesh_pathtbl.c
+++ b/net/mac80211/mesh_pathtbl.c
@@ -554,6 +554,7 @@ static void mesh_path_free_rcu(struct mesh_table *tbl,
 	del_timer_sync(&mpath->timer);
 	atomic_dec(&sdata->u.mesh.mpaths);
 	atomic_dec(&tbl->entries);
+	mesh_path_flush_pending(mpath);
 	kfree_rcu(mpath, rcu);
 }
 
-- 
2.25.1

[PATCH 4.14 39/51] arm64/alternatives: move length validation inside the subsection

[Greg Kroah-Hartman]

From: Sami Tolvanen <samitolvanen@google.com>

[ Upstream commit 966a0acce2fca776391823381dba95c40e03c339 ]

Commit f7b93d42945c ("arm64/alternatives: use subsections for replacement
sequences") breaks LLVM's integrated assembler, because due to its
one-pass design, it cannot compute instruction sequence lengths before the
layout for the subsection has been finalized. This change fixes the build
by moving the .org directives inside the subsection, so they are processed
after the subsection layout is known.

Fixes: f7b93d42945c ("arm64/alternatives: use subsections for replacement sequences")
Signed-off-by: Sami Tolvanen <samitolvanen@google.com>
Link: https://github.com/ClangBuiltLinux/linux/issues/1078
Link: https://lore.kernel.org/r/20200730153701.3892953-1-samitolvanen@google.com
Signed-off-by: Will Deacon <will@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 arch/arm64/include/asm/alternative.h | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/arm64/include/asm/alternative.h b/arch/arm64/include/asm/alternative.h
index 1824768fb1ee9..3abb2dacb43f4 100644
--- a/arch/arm64/include/asm/alternative.h
+++ b/arch/arm64/include/asm/alternative.h
@@ -72,9 +72,9 @@ void apply_alternatives(void *start, size_t length);
 	"663:\n\t"							\
 	newinstr "\n"							\
 	"664:\n\t"							\
-	".previous\n\t"							\
 	".org	. - (664b-663b) + (662b-661b)\n\t"			\
-	".org	. - (662b-661b) + (664b-663b)\n"			\
+	".org	. - (662b-661b) + (664b-663b)\n\t"			\
+	".previous\n"							\
 	".endif\n"
 
 #define __ALTERNATIVE_CFG_CB(oldinstr, feature, cfg_enabled, cb)	\
-- 
2.25.1

[PATCH 4.14 40/51] arm64: csum: Fix handling of bad packets

[Greg Kroah-Hartman]

From: Robin Murphy <robin.murphy@arm.com>

[ Upstream commit 05fb3dbda187bbd9cc1cd0e97e5d6595af570ac6 ]

Although iph is expected to point to at least 20 bytes of valid memory,
ihl may be bogus, for example on reception of a corrupt packet. If it
happens to be less than 5, we really don't want to run away and
dereference 16GB worth of memory until it wraps back to exactly zero...

Fixes: 0e455d8e80aa ("arm64: Implement optimised IP checksum helpers")
Reported-by: guodeqing <geffrey.guo@huawei.com>
Signed-off-by: Robin Murphy <robin.murphy@arm.com>
Signed-off-by: Will Deacon <will@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 arch/arm64/include/asm/checksum.h | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/arch/arm64/include/asm/checksum.h b/arch/arm64/include/asm/checksum.h
index 0b6f5a7d4027c..fd11e0d70e446 100644
--- a/arch/arm64/include/asm/checksum.h
+++ b/arch/arm64/include/asm/checksum.h
@@ -30,16 +30,17 @@ static inline __sum16 ip_fast_csum(const void *iph, unsigned int ihl)
 {
 	__uint128_t tmp;
 	u64 sum;
+	int n = ihl; /* we want it signed */
 
 	tmp = *(const __uint128_t *)iph;
 	iph += 16;
-	ihl -= 4;
+	n -= 4;
 	tmp += ((tmp >> 64) | (tmp << 64));
 	sum = tmp >> 64;
 	do {
 		sum += *(const u32 *)iph;
 		iph += 4;
-	} while (--ihl);
+	} while (--n > 0);
 
 	sum += ((sum >> 32) | (sum << 32));
 	return csum_fold((__force u32)(sum >> 32));
-- 
2.25.1

[PATCH 4.14 41/51] usb: hso: Fix debug compile warning on sparc32

[Greg Kroah-Hartman]

From: Geert Uytterhoeven <geert@linux-m68k.org>

[ Upstream commit e0484010ec05191a8edf980413fc92f28050c1cc ]

On sparc32, tcflag_t is "unsigned long", unlike on all other
architectures, where it is "unsigned int":

    drivers/net/usb/hso.c: In function ‘hso_serial_set_termios’:
    include/linux/kern_levels.h:5:18: warning: format ‘%d’ expects argument of type ‘unsigned int’, but argument 4 has type ‘tcflag_t {aka long unsigned int}’ [-Wformat=]
    drivers/net/usb/hso.c:1393:3: note: in expansion of macro ‘hso_dbg’
       hso_dbg(0x16, "Termios called with: cflags new[%d] - old[%d]\n",
       ^~~~~~~
    include/linux/kern_levels.h:5:18: warning: format ‘%d’ expects argument of type ‘unsigned int’, but argument 5 has type ‘tcflag_t {aka long unsigned int}’ [-Wformat=]
    drivers/net/usb/hso.c:1393:3: note: in expansion of macro ‘hso_dbg’
       hso_dbg(0x16, "Termios called with: cflags new[%d] - old[%d]\n",
       ^~~~~~~

As "unsigned long" is 32-bit on sparc32, fix this by casting all tcflag_t
parameters to "unsigned int".
While at it, use "%u" to format unsigned numbers.

Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/net/usb/hso.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/net/usb/hso.c b/drivers/net/usb/hso.c
index 6597d1f8d68c3..7988c41bff1d5 100644
--- a/drivers/net/usb/hso.c
+++ b/drivers/net/usb/hso.c
@@ -1402,8 +1402,9 @@ static void hso_serial_set_termios(struct tty_struct *tty, struct ktermios *old)
 	unsigned long flags;
 
 	if (old)
-		hso_dbg(0x16, "Termios called with: cflags new[%d] - old[%d]\n",
-			tty->termios.c_cflag, old->c_cflag);
+		hso_dbg(0x16, "Termios called with: cflags new[%u] - old[%u]\n",
+			(unsigned int)tty->termios.c_cflag,
+			(unsigned int)old->c_cflag);
 
 	/* the actual setup */
 	spin_lock_irqsave(&serial->serial_lock, flags);
-- 
2.25.1

[PATCH 4.14 42/51] qed: Disable "MFW indication via attention" SPAM every 5 minutes

[Greg Kroah-Hartman]

From: Laurence Oberman <loberman@redhat.com>

[ Upstream commit 1d61e21852d3161f234b9656797669fe185c251b ]

This is likely firmware causing this but its starting to annoy customers.
Change the message level to verbose to prevent the spam.
Note that this seems to only show up with ISCSI enabled on the HBA via the
qedi driver.

Signed-off-by: Laurence Oberman <loberman@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/net/ethernet/qlogic/qed/qed_int.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/qlogic/qed/qed_int.c b/drivers/net/ethernet/qlogic/qed/qed_int.c
index c5d9f290ec4c7..f8d1d02a3cd4a 100644
--- a/drivers/net/ethernet/qlogic/qed/qed_int.c
+++ b/drivers/net/ethernet/qlogic/qed/qed_int.c
@@ -1015,7 +1015,8 @@ static int qed_int_attentions(struct qed_hwfn *p_hwfn)
 			index, attn_bits, attn_acks, asserted_bits,
 			deasserted_bits, p_sb_attn_sw->known_attn);
 	} else if (asserted_bits == 0x100) {
-		DP_INFO(p_hwfn, "MFW indication via attention\n");
+		DP_VERBOSE(p_hwfn, NETIF_MSG_INTR,
+			   "MFW indication via attention\n");
 	} else {
 		DP_VERBOSE(p_hwfn, NETIF_MSG_INTR,
 			   "MFW indication [deassertion]\n");
-- 
2.25.1

[PATCH 4.14 43/51] nfc: s3fwrn5: add missing release on skb in s3fwrn5_recv_frame

[Greg Kroah-Hartman]

From: Navid Emamdoost <navid.emamdoost@gmail.com>

[ Upstream commit 1e8fd3a97f2d83a7197876ceb4f37b4c2b00a0f3 ]

The implementation of s3fwrn5_recv_frame() is supposed to consume skb on
all execution paths. Release skb before returning -ENODEV.

Signed-off-by: Navid Emamdoost <navid.emamdoost@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/nfc/s3fwrn5/core.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/nfc/s3fwrn5/core.c b/drivers/nfc/s3fwrn5/core.c
index 9d9c8d57a042d..64b58455e620b 100644
--- a/drivers/nfc/s3fwrn5/core.c
+++ b/drivers/nfc/s3fwrn5/core.c
@@ -209,6 +209,7 @@ int s3fwrn5_recv_frame(struct nci_dev *ndev, struct sk_buff *skb,
 	case S3FWRN5_MODE_FW:
 		return s3fwrn5_fw_recv_frame(ndev, skb);
 	default:
+		kfree_skb(skb);
 		return -ENODEV;
 	}
 }
-- 
2.25.1

[PATCH 4.14 44/51] parisc: add support for cmpxchg on u8 pointers

[Greg Kroah-Hartman]

From: Liam Beguin <liambeguin@gmail.com>

[ Upstream commit b344d6a83d01c52fddbefa6b3b4764da5b1022a0 ]

The kernel test bot reported[1] that using set_mask_bits on a u8 causes
the following issue on parisc:

	hppa-linux-ld: drivers/phy/ti/phy-tusb1210.o: in function `tusb1210_probe':
	>> (.text+0x2f4): undefined reference to `__cmpxchg_called_with_bad_pointer'
	>> hppa-linux-ld: (.text+0x324): undefined reference to `__cmpxchg_called_with_bad_pointer'
	hppa-linux-ld: (.text+0x354): undefined reference to `__cmpxchg_called_with_bad_pointer'

Add support for cmpxchg on u8 pointers.

[1] https://lore.kernel.org/patchwork/patch/1272617/#1468946

Reported-by: kernel test robot <lkp@intel.com>
Signed-off-by: Liam Beguin <liambeguin@gmail.com>
Tested-by: Dave Anglin <dave.anglin@bell.net>
Signed-off-by: Helge Deller <deller@gmx.de>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 arch/parisc/include/asm/cmpxchg.h |  2 ++
 arch/parisc/lib/bitops.c          | 12 ++++++++++++
 2 files changed, 14 insertions(+)

diff --git a/arch/parisc/include/asm/cmpxchg.h b/arch/parisc/include/asm/cmpxchg.h
index ab5c215cf46c3..0689585758717 100644
--- a/arch/parisc/include/asm/cmpxchg.h
+++ b/arch/parisc/include/asm/cmpxchg.h
@@ -60,6 +60,7 @@ extern void __cmpxchg_called_with_bad_pointer(void);
 extern unsigned long __cmpxchg_u32(volatile unsigned int *m, unsigned int old,
 				   unsigned int new_);
 extern u64 __cmpxchg_u64(volatile u64 *ptr, u64 old, u64 new_);
+extern u8 __cmpxchg_u8(volatile u8 *ptr, u8 old, u8 new_);
 
 /* don't worry...optimizer will get rid of most of this */
 static inline unsigned long
@@ -71,6 +72,7 @@ __cmpxchg(volatile void *ptr, unsigned long old, unsigned long new_, int size)
 #endif
 	case 4: return __cmpxchg_u32((unsigned int *)ptr,
 				     (unsigned int)old, (unsigned int)new_);
+	case 1: return __cmpxchg_u8((u8 *)ptr, (u8)old, (u8)new_);
 	}
 	__cmpxchg_called_with_bad_pointer();
 	return old;
diff --git a/arch/parisc/lib/bitops.c b/arch/parisc/lib/bitops.c
index 70ffbcf889b8e..2e4d1f05a9264 100644
--- a/arch/parisc/lib/bitops.c
+++ b/arch/parisc/lib/bitops.c
@@ -79,3 +79,15 @@ unsigned long __cmpxchg_u32(volatile unsigned int *ptr, unsigned int old, unsign
 	_atomic_spin_unlock_irqrestore(ptr, flags);
 	return (unsigned long)prev;
 }
+
+u8 __cmpxchg_u8(volatile u8 *ptr, u8 old, u8 new)
+{
+	unsigned long flags;
+	u8 prev;
+
+	_atomic_spin_lock_irqsave(ptr, flags);
+	if ((prev = *ptr) == old)
+		*ptr = new;
+	_atomic_spin_unlock_irqrestore(ptr, flags);
+	return prev;
+}
-- 
2.25.1

[PATCH 4.14 45/51] net: ethernet: ravb: exit if re-initialization fails in tx timeout

[Greg Kroah-Hartman]

From: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>

[ Upstream commit 015c5d5e6aa3523c758a70eb87b291cece2dbbb4 ]

According to the report of [1], this driver is possible to cause
the following error in ravb_tx_timeout_work().

ravb e6800000.ethernet ethernet: failed to switch device to config mode

This error means that the hardware could not change the state
from "Operation" to "Configuration" while some tx and/or rx queue
are operating. After that, ravb_config() in ravb_dmac_init() will fail,
and then any descriptors will be not allocaled anymore so that NULL
pointer dereference happens after that on ravb_start_xmit().

To fix the issue, the ravb_tx_timeout_work() should check
the return values of ravb_stop_dma() and ravb_dmac_init().
If ravb_stop_dma() fails, ravb_tx_timeout_work() re-enables TX and RX
and just exits. If ravb_dmac_init() fails, just exits.

[1]
https://lore.kernel.org/linux-renesas-soc/20200518045452.2390-1-dirk.behme@de.bosch.com/

Reported-by: Dirk Behme <dirk.behme@de.bosch.com>
Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Reviewed-by: Sergei Shtylyov <sergei.shtylyov@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/net/ethernet/renesas/ravb_main.c | 26 ++++++++++++++++++++++--
 1 file changed, 24 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/renesas/ravb_main.c b/drivers/net/ethernet/renesas/ravb_main.c
index d73617cc3b159..9f4d93a16b7e5 100644
--- a/drivers/net/ethernet/renesas/ravb_main.c
+++ b/drivers/net/ethernet/renesas/ravb_main.c
@@ -1482,6 +1482,7 @@ static void ravb_tx_timeout_work(struct work_struct *work)
 	struct ravb_private *priv = container_of(work, struct ravb_private,
 						 work);
 	struct net_device *ndev = priv->ndev;
+	int error;
 
 	netif_tx_stop_all_queues(ndev);
 
@@ -1490,15 +1491,36 @@ static void ravb_tx_timeout_work(struct work_struct *work)
 		ravb_ptp_stop(ndev);
 
 	/* Wait for DMA stopping */
-	ravb_stop_dma(ndev);
+	if (ravb_stop_dma(ndev)) {
+		/* If ravb_stop_dma() fails, the hardware is still operating
+		 * for TX and/or RX. So, this should not call the following
+		 * functions because ravb_dmac_init() is possible to fail too.
+		 * Also, this should not retry ravb_stop_dma() again and again
+		 * here because it's possible to wait forever. So, this just
+		 * re-enables the TX and RX and skip the following
+		 * re-initialization procedure.
+		 */
+		ravb_rcv_snd_enable(ndev);
+		goto out;
+	}
 
 	ravb_ring_free(ndev, RAVB_BE);
 	ravb_ring_free(ndev, RAVB_NC);
 
 	/* Device init */
-	ravb_dmac_init(ndev);
+	error = ravb_dmac_init(ndev);
+	if (error) {
+		/* If ravb_dmac_init() fails, descriptors are freed. So, this
+		 * should return here to avoid re-enabling the TX and RX in
+		 * ravb_emac_init().
+		 */
+		netdev_err(ndev, "%s: ravb_dmac_init() failed, error %d\n",
+			   __func__, error);
+		return;
+	}
 	ravb_emac_init(ndev);
 
+out:
 	/* Initialise PTP Clock driver */
 	if (priv->chip_id == RCAR_GEN2)
 		ravb_ptp_init(ndev, priv->pdev);
-- 
2.25.1

[PATCH 4.14 46/51] Revert "i2c: cadence: Fix the hold bit setting"

[Greg Kroah-Hartman]

From: Raviteja Narayanam <raviteja.narayanam@xilinx.com>

[ Upstream commit 0db9254d6b896b587759e2c844c277fb1a6da5b9 ]

This reverts commit d358def706880defa4c9e87381c5bf086a97d5f9.

There are two issues with "i2c: cadence: Fix the hold bit setting" commit.

1. In case of combined message request from user space, when the HOLD
bit is cleared in cdns_i2c_mrecv function, a STOP condition is sent
on the bus even before the last message is started. This is because when
the HOLD bit is cleared, the FIFOS are empty and there is no pending
transfer. The STOP condition should occur only after the last message
is completed.

2. The code added by the commit is redundant. Driver is handling the
setting/clearing of HOLD bit in right way before the commit.

The setting of HOLD bit based on 'bus_hold_flag' is taken care in
cdns_i2c_master_xfer function even before cdns_i2c_msend/cdns_i2c_recv
functions.

The clearing of HOLD bit is taken care at the end of cdns_i2c_msend and
cdns_i2c_recv functions based on bus_hold_flag and byte count.
Since clearing of HOLD bit is done after the slave address is written to
the register (writing to address register triggers the message transfer),
it is ensured that STOP condition occurs at the right time after
completion of the pending transfer (last message).

Signed-off-by: Raviteja Narayanam <raviteja.narayanam@xilinx.com>
Acked-by: Michal Simek <michal.simek@xilinx.com>
Signed-off-by: Wolfram Sang <wsa@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/i2c/busses/i2c-cadence.c | 9 ++-------
 1 file changed, 2 insertions(+), 7 deletions(-)

diff --git a/drivers/i2c/busses/i2c-cadence.c b/drivers/i2c/busses/i2c-cadence.c
index d917cefc5a19c..b136057182916 100644
--- a/drivers/i2c/busses/i2c-cadence.c
+++ b/drivers/i2c/busses/i2c-cadence.c
@@ -382,10 +382,8 @@ static void cdns_i2c_mrecv(struct cdns_i2c *id)
 	 * Check for the message size against FIFO depth and set the
 	 * 'hold bus' bit if it is greater than FIFO depth.
 	 */
-	if ((id->recv_count > CDNS_I2C_FIFO_DEPTH)  || id->bus_hold_flag)
+	if (id->recv_count > CDNS_I2C_FIFO_DEPTH)
 		ctrl_reg |= CDNS_I2C_CR_HOLD;
-	else
-		ctrl_reg = ctrl_reg & ~CDNS_I2C_CR_HOLD;
 
 	cdns_i2c_writereg(ctrl_reg, CDNS_I2C_CR_OFFSET);
 
@@ -442,11 +440,8 @@ static void cdns_i2c_msend(struct cdns_i2c *id)
 	 * Check for the message size against FIFO depth and set the
 	 * 'hold bus' bit if it is greater than FIFO depth.
 	 */
-	if ((id->send_count > CDNS_I2C_FIFO_DEPTH) || id->bus_hold_flag)
+	if (id->send_count > CDNS_I2C_FIFO_DEPTH)
 		ctrl_reg |= CDNS_I2C_CR_HOLD;
-	else
-		ctrl_reg = ctrl_reg & ~CDNS_I2C_CR_HOLD;
-
 	cdns_i2c_writereg(ctrl_reg, CDNS_I2C_CR_OFFSET);
 
 	/* Clear the interrupts in interrupt status register. */
-- 
2.25.1

[PATCH 4.14 47/51] x86/unwind/orc: Fix ORC for newly forked tasks

[Greg Kroah-Hartman]

From: Josh Poimboeuf <jpoimboe@redhat.com>

[ Upstream commit 372a8eaa05998cd45b3417d0e0ffd3a70978211a ]

The ORC unwinder fails to unwind newly forked tasks which haven't yet
run on the CPU.  It correctly reads the 'ret_from_fork' instruction
pointer from the stack, but it incorrectly interprets that value as a
call stack address rather than a "signal" one, so the address gets
incorrectly decremented in the call to orc_find(), resulting in bad ORC
data.

Fix it by forcing 'ret_from_fork' frames to be signal frames.

Reported-by: Wang ShaoBo <bobo.shaobowang@huawei.com>
Signed-off-by: Josh Poimboeuf <jpoimboe@redhat.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Tested-by: Wang ShaoBo <bobo.shaobowang@huawei.com>
Link: https://lkml.kernel.org/r/f91a8778dde8aae7f71884b5df2b16d552040441.1594994374.git.jpoimboe@redhat.com
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 arch/x86/kernel/unwind_orc.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/arch/x86/kernel/unwind_orc.c b/arch/x86/kernel/unwind_orc.c
index a9a55e76a43f9..a5e2ce931f692 100644
--- a/arch/x86/kernel/unwind_orc.c
+++ b/arch/x86/kernel/unwind_orc.c
@@ -346,8 +346,11 @@ bool unwind_next_frame(struct unwind_state *state)
 	/*
 	 * Find the orc_entry associated with the text address.
 	 *
-	 * Decrement call return addresses by one so they work for sibling
-	 * calls and calls to noreturn functions.
+	 * For a call frame (as opposed to a signal frame), state->ip points to
+	 * the instruction after the call.  That instruction's stack layout
+	 * could be different from the call instruction's layout, for example
+	 * if the call was to a noreturn function.  So get the ORC data for the
+	 * call instruction itself.
 	 */
 	orc = orc_find(state->signal ? state->ip : state->ip - 1);
 	if (!orc || orc->sp_reg == ORC_REG_UNDEFINED)
@@ -550,6 +553,7 @@ void __unwind_start(struct unwind_state *state, struct task_struct *task,
 		state->sp = task->thread.sp;
 		state->bp = READ_ONCE_NOCHECK(frame->bp);
 		state->ip = READ_ONCE_NOCHECK(frame->ret_addr);
+		state->signal = (void *)state->ip == ret_from_fork;
 	}
 
 	if (get_stack_info((unsigned long *)state->sp, state->task,
-- 
2.25.1

[PATCH 4.14 48/51] cxgb4: add missing release on skb in uld_send()

[Greg Kroah-Hartman]

From: Navid Emamdoost <navid.emamdoost@gmail.com>

[ Upstream commit e6827d1abdc9b061a57d7b7d3019c4e99fabea2f ]

In the implementation of uld_send(), the skb is consumed on all
execution paths except one. Release skb when returning NET_XMIT_DROP.

Signed-off-by: Navid Emamdoost <navid.emamdoost@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/net/ethernet/chelsio/cxgb4/sge.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/net/ethernet/chelsio/cxgb4/sge.c b/drivers/net/ethernet/chelsio/cxgb4/sge.c
index 0a5c4c7da5052..006f8b8aaa7dc 100644
--- a/drivers/net/ethernet/chelsio/cxgb4/sge.c
+++ b/drivers/net/ethernet/chelsio/cxgb4/sge.c
@@ -1812,6 +1812,7 @@ static inline int uld_send(struct adapter *adap, struct sk_buff *skb,
 	txq_info = adap->sge.uld_txq_info[tx_uld_type];
 	if (unlikely(!txq_info)) {
 		WARN_ON(true);
+		kfree_skb(skb);
 		return NET_XMIT_DROP;
 	}
 
-- 
2.25.1

[PATCH 4.14 49/51] xen-netfront: fix potential deadlock in xennet_remove()

[Greg Kroah-Hartman]

From: Andrea Righi <andrea.righi@canonical.com>

[ Upstream commit c2c633106453611be07821f53dff9e93a9d1c3f0 ]

There's a potential race in xennet_remove(); this is what the driver is
doing upon unregistering a network device:

  1. state = read bus state
  2. if state is not "Closed":
  3.    request to set state to "Closing"
  4.    wait for state to be set to "Closing"
  5.    request to set state to "Closed"
  6.    wait for state to be set to "Closed"

If the state changes to "Closed" immediately after step 1 we are stuck
forever in step 4, because the state will never go back from "Closed" to
"Closing".

Make sure to check also for state == "Closed" in step 4 to prevent the
deadlock.

Also add a 5 sec timeout any time we wait for the bus state to change,
to avoid getting stuck forever in wait_event().

Signed-off-by: Andrea Righi <andrea.righi@canonical.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/net/xen-netfront.c | 64 +++++++++++++++++++++++++-------------
 1 file changed, 42 insertions(+), 22 deletions(-)

diff --git a/drivers/net/xen-netfront.c b/drivers/net/xen-netfront.c
index 91bf86cee2733..1131397454bd4 100644
--- a/drivers/net/xen-netfront.c
+++ b/drivers/net/xen-netfront.c
@@ -63,6 +63,8 @@ module_param_named(max_queues, xennet_max_queues, uint, 0644);
 MODULE_PARM_DESC(max_queues,
 		 "Maximum number of queues per virtual interface");
 
+#define XENNET_TIMEOUT  (5 * HZ)
+
 static const struct ethtool_ops xennet_ethtool_ops;
 
 struct netfront_cb {
@@ -1336,12 +1338,15 @@ static struct net_device *xennet_create_dev(struct xenbus_device *dev)
 
 	netif_carrier_off(netdev);
 
-	xenbus_switch_state(dev, XenbusStateInitialising);
-	wait_event(module_wq,
-		   xenbus_read_driver_state(dev->otherend) !=
-		   XenbusStateClosed &&
-		   xenbus_read_driver_state(dev->otherend) !=
-		   XenbusStateUnknown);
+	do {
+		xenbus_switch_state(dev, XenbusStateInitialising);
+		err = wait_event_timeout(module_wq,
+				 xenbus_read_driver_state(dev->otherend) !=
+				 XenbusStateClosed &&
+				 xenbus_read_driver_state(dev->otherend) !=
+				 XenbusStateUnknown, XENNET_TIMEOUT);
+	} while (!err);
+
 	return netdev;
 
  exit:
@@ -2142,28 +2147,43 @@ static const struct attribute_group xennet_dev_group = {
 };
 #endif /* CONFIG_SYSFS */
 
-static int xennet_remove(struct xenbus_device *dev)
+static void xennet_bus_close(struct xenbus_device *dev)
 {
-	struct netfront_info *info = dev_get_drvdata(&dev->dev);
-
-	dev_dbg(&dev->dev, "%s\n", dev->nodename);
+	int ret;
 
-	if (xenbus_read_driver_state(dev->otherend) != XenbusStateClosed) {
+	if (xenbus_read_driver_state(dev->otherend) == XenbusStateClosed)
+		return;
+	do {
 		xenbus_switch_state(dev, XenbusStateClosing);
-		wait_event(module_wq,
-			   xenbus_read_driver_state(dev->otherend) ==
-			   XenbusStateClosing ||
-			   xenbus_read_driver_state(dev->otherend) ==
-			   XenbusStateUnknown);
+		ret = wait_event_timeout(module_wq,
+				   xenbus_read_driver_state(dev->otherend) ==
+				   XenbusStateClosing ||
+				   xenbus_read_driver_state(dev->otherend) ==
+				   XenbusStateClosed ||
+				   xenbus_read_driver_state(dev->otherend) ==
+				   XenbusStateUnknown,
+				   XENNET_TIMEOUT);
+	} while (!ret);
+
+	if (xenbus_read_driver_state(dev->otherend) == XenbusStateClosed)
+		return;
 
+	do {
 		xenbus_switch_state(dev, XenbusStateClosed);
-		wait_event(module_wq,
-			   xenbus_read_driver_state(dev->otherend) ==
-			   XenbusStateClosed ||
-			   xenbus_read_driver_state(dev->otherend) ==
-			   XenbusStateUnknown);
-	}
+		ret = wait_event_timeout(module_wq,
+				   xenbus_read_driver_state(dev->otherend) ==
+				   XenbusStateClosed ||
+				   xenbus_read_driver_state(dev->otherend) ==
+				   XenbusStateUnknown,
+				   XENNET_TIMEOUT);
+	} while (!ret);
+}
+
+static int xennet_remove(struct xenbus_device *dev)
+{
+	struct netfront_info *info = dev_get_drvdata(&dev->dev);
 
+	xennet_bus_close(dev);
 	xennet_disconnect_backend(info);
 
 	if (info->netdev->reg_state == NETREG_REGISTERED)
-- 
2.25.1

[PATCH 4.14 50/51] KVM: LAPIC: Prevent setting the tscdeadline timer if the lapic is hw disabled

[Greg Kroah-Hartman]

From: Wanpeng Li <wanpengli@tencent.com>

commit d2286ba7d574ba3103a421a2f9ec17cb5b0d87a1 upstream.

Prevent setting the tscdeadline timer if the lapic is hw disabled.

Fixes: bce87cce88 (KVM: x86: consolidate different ways to test for in-kernel LAPIC)
Cc: <stable@vger.kernel.org>
Signed-off-by: Wanpeng Li <wanpengli@tencent.com>
Message-Id: <1596165141-28874-1-git-send-email-wanpengli@tencent.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 arch/x86/kvm/lapic.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/arch/x86/kvm/lapic.c
+++ b/arch/x86/kvm/lapic.c
@@ -1918,7 +1918,7 @@ void kvm_set_lapic_tscdeadline_msr(struc
 {
 	struct kvm_lapic *apic = vcpu->arch.apic;
 
-	if (!lapic_in_kernel(vcpu) || apic_lvtt_oneshot(apic) ||
+	if (!kvm_apic_present(vcpu) || apic_lvtt_oneshot(apic) ||
 			apic_lvtt_period(apic))
 		return;
 

[PATCH 4.14 51/51] x86/i8259: Use printk_deferred() to prevent deadlock

[Greg Kroah-Hartman]

From: Thomas Gleixner <tglx@linutronix.de>

commit bdd65589593edd79b6a12ce86b3b7a7c6dae5208 upstream.

0day reported a possible circular locking dependency:

Chain exists of:
  &irq_desc_lock_class --> console_owner --> &port_lock_key

 Possible unsafe locking scenario:

       CPU0                    CPU1
       ----                    ----
  lock(&port_lock_key);
                               lock(console_owner);
                               lock(&port_lock_key);
  lock(&irq_desc_lock_class);

The reason for this is a printk() in the i8259 interrupt chip driver
which is invoked with the irq descriptor lock held, which reverses the
lock operations vs. printk() from arbitrary contexts.

Switch the printk() to printk_deferred() to avoid that.

Reported-by: kernel test robot <lkp@intel.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Cc: stable@vger.kernel.org
Link: https://lore.kernel.org/r/87365abt2v.fsf@nanos.tec.linutronix.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 arch/x86/kernel/i8259.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/arch/x86/kernel/i8259.c
+++ b/arch/x86/kernel/i8259.c
@@ -206,7 +206,7 @@ spurious_8259A_irq:
 		 * lets ACK and report it. [once per IRQ]
 		 */
 		if (!(spurious_irq_mask & irqmask)) {
-			printk(KERN_DEBUG
+			printk_deferred(KERN_DEBUG
 			       "spurious 8259A interrupt: IRQ%d.\n", irq);
 			spurious_irq_mask |= irqmask;
 		}