[PATCH 4.9 00/32] 4.9.219-rc1 review

[PATCH 4.9 00/32] 4.9.219-rc1 review

[Greg Kroah-Hartman]

This is the start of the stable review cycle for the 4.9.219 release.
There are 32 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 Mon, 13 Apr 2020 11:51:28 +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-4.9.219-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-4.9.y
and the diffstat can be found below.

thanks,

greg k-h

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

Greg Kroah-Hartman <gregkh@linuxfoundation.org>
    Linux 4.9.219-rc1

Hans Verkuil <hans.verkuil@cisco.com>
    drm_dp_mst_topology: fix broken drm_dp_sideband_parse_remote_dpcd_read()

Roger Quadros <rogerq@ti.com>
    usb: dwc3: don't set gadget->is_otg flag

Arun KS <arunks@codeaurora.org>
    arm64: Fix size of __early_cpu_boot_status

Rob Clark <robdclark@chromium.org>
    drm/msm: stop abusing dma_map/unmap for cache

Taniya Das <tdas@codeaurora.org>
    clk: qcom: rcg: Return failure for RCG update

Avihai Horon <avihaih@mellanox.com>
    RDMA/cm: Update num_paths in cma_resolve_iboe_route error flow

Qiujun Huang <hqjagain@gmail.com>
    Bluetooth: RFCOMM: fix ODEBUG bug in rfcomm_dev_ioctl

Ilya Dryomov <idryomov@gmail.com>
    ceph: canonicalize server path in place

Xiubo Li <xiubli@redhat.com>
    ceph: remove the extra slashes in the server path

Kaike Wan <kaike.wan@intel.com>
    IB/hfi1: Fix memory leaks in sysfs registration and unregistration

Kaike Wan <kaike.wan@intel.com>
    IB/hfi1: Call kobject_put() when kobject_init_and_add() fails

Paul Cercueil <paul@crapouillou.net>
    ASoC: jz4740-i2s: Fix divider written at incorrect offset in register

David Ahern <dsahern@kernel.org>
    tools/accounting/getdelays.c: fix netlink attribute length

Jason A. Donenfeld <Jason@zx2c4.com>
    random: always use batched entropy for get_random_u{32,64}

Oleksij Rempel <o.rempel@pengutronix.de>
    net: phy: micrel: kszphy_resume(): add delay after genphy_resume() before accessing PHY registers

Richard Palethorpe <rpalethorpe@suse.com>
    slcan: Don't transmit uninitialized stack data in padding

Jisheng Zhang <Jisheng.Zhang@synaptics.com>
    net: stmmac: dwmac1000: fix out-of-bounds mac address reg setting

Florian Fainelli <f.fainelli@gmail.com>
    net: dsa: bcm_sf2: Ensure correct sub-node is parsed

Randy Dunlap <rdunlap@infradead.org>
    mm: mempolicy: require at least one nodeid for MPOL_PREFERRED

Daniel Jordan <daniel.m.jordan@oracle.com>
    padata: always acquire cpu_hotplug_lock before pinst->lock

Florian Fainelli <f.fainelli@gmail.com>
    net: dsa: tag_brcm: Fix skb->fwd_offload_mark location

Eugene Syromiatnikov <esyr@redhat.com>
    coresight: do not use the BIT() macro in the UAPI header

Keith Busch <keith.busch@intel.com>
    blk-mq: Allow blocking queue tag iter callbacks

Jianchao Wang <jianchao.w.wang@oracle.com>
    blk-mq: sync the update nr_hw_queues with blk_mq_queue_tag_busy_iter

Lucas Stach <l.stach@pengutronix.de>
    drm/etnaviv: replace MMU flush marker with flush sequence

Marcelo Ricardo Leitner <marcelo.leitner@gmail.com>
    sctp: fix possibly using a bad saddr with a given dst

Qiujun Huang <hqjagain@gmail.com>
    sctp: fix refcount bug in sctp_wfree

William Dauchy <w.dauchy@criteo.com>
    net, ip_tunnel: fix interface lookup with no key

Qian Cai <cai@lca.pw>
    ipv4: fix a RCU-list lock in fib_triestat_seq_show

Gerd Hoffmann <kraxel@redhat.com>
    drm/bochs: downgrade pci_request_region failure from error to warning

Guillaume Nault <g.nault@alphalink.fr>
    l2tp: fix race between l2tp_session_delete() and l2tp_tunnel_closeall()

Guillaume Nault <g.nault@alphalink.fr>
    l2tp: ensure sessions are freed after their PPPOL2TP socket


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

Diffstat:

 Makefile                                           |  4 +-
 arch/arm64/kernel/head.S                           |  2 +-
 block/blk-mq-tag.c                                 |  9 +++-
 block/blk-mq.c                                     |  4 ++
 drivers/char/random.c                              | 10 +---
 drivers/clk/qcom/clk-rcg2.c                        |  2 +-
 drivers/gpu/drm/bochs/bochs_hw.c                   |  6 +--
 drivers/gpu/drm/drm_dp_mst_topology.c              |  1 +
 drivers/gpu/drm/etnaviv/etnaviv_buffer.c           | 10 ++--
 drivers/gpu/drm/etnaviv/etnaviv_gpu.c              |  2 +-
 drivers/gpu/drm/etnaviv/etnaviv_gpu.h              |  1 +
 drivers/gpu/drm/etnaviv/etnaviv_mmu.c              |  6 +--
 drivers/gpu/drm/etnaviv/etnaviv_mmu.h              |  2 +-
 drivers/gpu/drm/msm/msm_gem.c                      |  4 +-
 drivers/infiniband/core/cma.c                      |  1 +
 drivers/infiniband/hw/hfi1/sysfs.c                 | 26 ++++++++---
 drivers/net/can/slcan.c                            |  4 +-
 drivers/net/dsa/bcm_sf2.c                          |  7 ++-
 .../net/ethernet/stmicro/stmmac/dwmac1000_core.c   |  2 +-
 drivers/net/phy/micrel.c                           |  7 +++
 drivers/usb/dwc3/gadget.c                          |  1 -
 fs/ceph/super.c                                    | 54 ++++++++++++++--------
 fs/ceph/super.h                                    |  2 +-
 include/uapi/linux/coresight-stm.h                 |  6 ++-
 kernel/padata.c                                    |  4 +-
 mm/mempolicy.c                                     |  6 ++-
 net/bluetooth/rfcomm/tty.c                         |  4 +-
 net/dsa/tag_brcm.c                                 |  4 +-
 net/ipv4/fib_trie.c                                |  3 ++
 net/ipv4/ip_tunnel.c                               |  6 +--
 net/l2tp/l2tp_core.c                               |  6 +++
 net/l2tp/l2tp_core.h                               |  1 +
 net/l2tp/l2tp_ppp.c                                |  8 ++--
 net/sctp/ipv6.c                                    | 20 +++++---
 net/sctp/protocol.c                                | 28 +++++++----
 net/sctp/socket.c                                  | 31 +++++++++----
 sound/soc/jz4740/jz4740-i2s.c                      |  2 +-
 tools/accounting/getdelays.c                       |  2 +-
 38 files changed, 193 insertions(+), 105 deletions(-)

[PATCH 4.9 01/32] l2tp: ensure sessions are freed after their PPPOL2TP socket

[Greg Kroah-Hartman]

From: Guillaume Nault <g.nault@alphalink.fr>

commit cdd10c9627496ad25c87ce6394e29752253c69d3 upstream.

If l2tp_tunnel_delete() or l2tp_tunnel_closeall() deletes a session
right after pppol2tp_release() orphaned its socket, then the 'sock'
variable of the pppol2tp_session_close() callback is NULL. Yet the
session is still used by pppol2tp_release().

Therefore we need to take an extra reference in any case, to prevent
l2tp_tunnel_delete() or l2tp_tunnel_closeall() from freeing the session.

Since the pppol2tp_session_close() callback is only set if the session
is associated to a PPPOL2TP socket and that both l2tp_tunnel_delete()
and l2tp_tunnel_closeall() hold the PPPOL2TP socket before calling
pppol2tp_session_close(), we're sure that pppol2tp_session_close() and
pppol2tp_session_destruct() are paired and called in the right order.
So the reference taken by the former will be released by the later.

Signed-off-by: Guillaume Nault <g.nault@alphalink.fr>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Will Deacon <will@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 net/l2tp/l2tp_ppp.c |    8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

--- a/net/l2tp/l2tp_ppp.c
+++ b/net/l2tp/l2tp_ppp.c
@@ -437,11 +437,11 @@ static void pppol2tp_session_close(struc
 
 	BUG_ON(session->magic != L2TP_SESSION_MAGIC);
 
-	if (sock) {
+	if (sock)
 		inet_shutdown(sock, SEND_SHUTDOWN);
-		/* Don't let the session go away before our socket does */
-		l2tp_session_inc_refcount(session);
-	}
+
+	/* Don't let the session go away before our socket does */
+	l2tp_session_inc_refcount(session);
 }
 
 /* Really kill the session socket. (Called from sock_put() if

[PATCH 4.9 02/32] l2tp: fix race between l2tp_session_delete() and l2tp_tunnel_closeall()

[Greg Kroah-Hartman]

From: Guillaume Nault <g.nault@alphalink.fr>

commit b228a94066406b6c456321d69643b0d7ce11cfa6 upstream.

There are several ways to remove L2TP sessions:

  * deleting a session explicitly using the netlink interface (with
    L2TP_CMD_SESSION_DELETE),
  * deleting the session's parent tunnel (either by closing the
    tunnel's file descriptor or using the netlink interface),
  * closing the PPPOL2TP file descriptor of a PPP pseudo-wire.

In some cases, when these methods are used concurrently on the same
session, the session can be removed twice, leading to use-after-free
bugs.

This patch adds a 'dead' flag, used by l2tp_session_delete() and
l2tp_tunnel_closeall() to prevent them from stepping on each other's
toes.

The session deletion path used when closing a PPPOL2TP file descriptor
doesn't need to be adapted. It already has to ensure that a session
remains valid for the lifetime of its PPPOL2TP file descriptor.
So it takes an extra reference on the session in the ->session_close()
callback (pppol2tp_session_close()), which is eventually dropped
in the ->sk_destruct() callback of the PPPOL2TP socket
(pppol2tp_session_destruct()).
Still, __l2tp_session_unhash() and l2tp_session_queue_purge() can be
called twice and even concurrently for a given session, but thanks to
proper locking and re-initialisation of list fields, this is not an
issue.

Signed-off-by: Guillaume Nault <g.nault@alphalink.fr>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Will Deacon <will@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 net/l2tp/l2tp_core.c |    6 ++++++
 net/l2tp/l2tp_core.h |    1 +
 2 files changed, 7 insertions(+)

--- a/net/l2tp/l2tp_core.c
+++ b/net/l2tp/l2tp_core.c
@@ -1351,6 +1351,9 @@ again:
 
 			hlist_del_init(&session->hlist);
 
+			if (test_and_set_bit(0, &session->dead))
+				goto again;
+
 			if (session->ref != NULL)
 				(*session->ref)(session);
 
@@ -1799,6 +1802,9 @@ EXPORT_SYMBOL_GPL(__l2tp_session_unhash)
  */
 int l2tp_session_delete(struct l2tp_session *session)
 {
+	if (test_and_set_bit(0, &session->dead))
+		return 0;
+
 	if (session->ref)
 		(*session->ref)(session);
 	__l2tp_session_unhash(session);
--- a/net/l2tp/l2tp_core.h
+++ b/net/l2tp/l2tp_core.h
@@ -84,6 +84,7 @@ struct l2tp_session_cfg {
 struct l2tp_session {
 	int			magic;		/* should be
 						 * L2TP_SESSION_MAGIC */
+	long			dead;
 
 	struct l2tp_tunnel	*tunnel;	/* back pointer to tunnel
 						 * context */

[PATCH 4.9 03/32] drm/bochs: downgrade pci_request_region failure from error to warning

[Greg Kroah-Hartman]

From: Gerd Hoffmann <kraxel@redhat.com>

[ Upstream commit 8c34cd1a7f089dc03933289c5d4a4d1489549828 ]

Shutdown of firmware framebuffer has a bunch of problems.  Because
of this the framebuffer region might still be reserved even after
drm_fb_helper_remove_conflicting_pci_framebuffers() returned.

Don't consider pci_request_region() failure for the framebuffer
region as fatal error to workaround this issue.

Reported-by: Marek Marczykowski-Górecki <marmarek@invisiblethingslab.com>
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Acked-by: Sam Ravnborg <sam@ravnborg.org>
Link: http://patchwork.freedesktop.org/patch/msgid/20200313084152.2734-1-kraxel@redhat.com
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/gpu/drm/bochs/bochs_hw.c | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/bochs/bochs_hw.c b/drivers/gpu/drm/bochs/bochs_hw.c
index a39b0343c197d..401c218567af9 100644
--- a/drivers/gpu/drm/bochs/bochs_hw.c
+++ b/drivers/gpu/drm/bochs/bochs_hw.c
@@ -97,10 +97,8 @@ int bochs_hw_init(struct drm_device *dev, uint32_t flags)
 		size = min(size, mem);
 	}
 
-	if (pci_request_region(pdev, 0, "bochs-drm") != 0) {
-		DRM_ERROR("Cannot request framebuffer\n");
-		return -EBUSY;
-	}
+	if (pci_request_region(pdev, 0, "bochs-drm") != 0)
+		DRM_WARN("Cannot request framebuffer, boot fb still active?\n");
 
 	bochs->fb_map = ioremap(addr, size);
 	if (bochs->fb_map == NULL) {
-- 
2.20.1

[PATCH 4.9 04/32] ipv4: fix a RCU-list lock in fib_triestat_seq_show

[Greg Kroah-Hartman]

From: Qian Cai <cai@lca.pw>

[ Upstream commit fbe4e0c1b298b4665ee6915266c9d6c5b934ef4a ]

fib_triestat_seq_show() calls hlist_for_each_entry_rcu(tb, head,
tb_hlist) without rcu_read_lock() will trigger a warning,

 net/ipv4/fib_trie.c:2579 RCU-list traversed in non-reader section!!

 other info that might help us debug this:

 rcu_scheduler_active = 2, debug_locks = 1
 1 lock held by proc01/115277:
  #0: c0000014507acf00 (&p->lock){+.+.}-{3:3}, at: seq_read+0x58/0x670

 Call Trace:
  dump_stack+0xf4/0x164 (unreliable)
  lockdep_rcu_suspicious+0x140/0x164
  fib_triestat_seq_show+0x750/0x880
  seq_read+0x1a0/0x670
  proc_reg_read+0x10c/0x1b0
  __vfs_read+0x3c/0x70
  vfs_read+0xac/0x170
  ksys_read+0x7c/0x140
  system_call+0x5c/0x68

Fix it by adding a pair of rcu_read_lock/unlock() and use
cond_resched_rcu() to avoid the situation where walking of a large
number of items  may prevent scheduling for a long time.

Signed-off-by: Qian Cai <cai@lca.pw>
Reviewed-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 net/ipv4/fib_trie.c |    3 +++
 1 file changed, 3 insertions(+)

--- a/net/ipv4/fib_trie.c
+++ b/net/ipv4/fib_trie.c
@@ -2256,6 +2256,7 @@ static int fib_triestat_seq_show(struct
 		   " %Zd bytes, size of tnode: %Zd bytes.\n",
 		   LEAF_SIZE, TNODE_SIZE(0));
 
+	rcu_read_lock();
 	for (h = 0; h < FIB_TABLE_HASHSZ; h++) {
 		struct hlist_head *head = &net->ipv4.fib_table_hash[h];
 		struct fib_table *tb;
@@ -2275,7 +2276,9 @@ static int fib_triestat_seq_show(struct
 			trie_show_usage(seq, t->stats);
 #endif
 		}
+		cond_resched_rcu();
 	}
+	rcu_read_unlock();
 
 	return 0;
 }

[PATCH 4.9 05/32] net, ip_tunnel: fix interface lookup with no key

[Greg Kroah-Hartman]

From: William Dauchy <w.dauchy@criteo.com>

[ Upstream commit 25629fdaff2ff509dd0b3f5ff93d70a75e79e0a1 ]

when creating a new ipip interface with no local/remote configuration,
the lookup is done with TUNNEL_NO_KEY flag, making it impossible to
match the new interface (only possible match being fallback or metada
case interface); e.g: `ip link add tunl1 type ipip dev eth0`

To fix this case, adding a flag check before the key comparison so we
permit to match an interface with no local/remote config; it also avoids
breaking possible userland tools relying on TUNNEL_NO_KEY flag and
uninitialised key.

context being on my side, I'm creating an extra ipip interface attached
to the physical one, and moving it to a dedicated namespace.

Fixes: c54419321455 ("GRE: Refactor GRE tunneling code.")
Signed-off-by: William Dauchy <w.dauchy@criteo.com>
Signed-off-by: Nicolas Dichtel <nicolas.dichtel@6wind.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 net/ipv4/ip_tunnel.c |    6 +-----
 1 file changed, 1 insertion(+), 5 deletions(-)

--- a/net/ipv4/ip_tunnel.c
+++ b/net/ipv4/ip_tunnel.c
@@ -155,11 +155,8 @@ struct ip_tunnel *ip_tunnel_lookup(struc
 			cand = t;
 	}
 
-	if (flags & TUNNEL_NO_KEY)
-		goto skip_key_lookup;
-
 	hlist_for_each_entry_rcu(t, head, hash_node) {
-		if (t->parms.i_key != key ||
+		if ((!(flags & TUNNEL_NO_KEY) && t->parms.i_key != key) ||
 		    t->parms.iph.saddr != 0 ||
 		    t->parms.iph.daddr != 0 ||
 		    !(t->dev->flags & IFF_UP))
@@ -171,7 +168,6 @@ struct ip_tunnel *ip_tunnel_lookup(struc
 			cand = t;
 	}
 
-skip_key_lookup:
 	if (cand)
 		return cand;
 

[PATCH 4.9 06/32] sctp: fix refcount bug in sctp_wfree

[Greg Kroah-Hartman]

From: Qiujun Huang <hqjagain@gmail.com>

[ Upstream commit 5c3e82fe159622e46e91458c1a6509c321a62820 ]

We should iterate over the datamsgs to move
all chunks(skbs) to newsk.

The following case cause the bug:
for the trouble SKB, it was in outq->transmitted list

sctp_outq_sack
        sctp_check_transmitted
                SKB was moved to outq->sacked list
        then throw away the sack queue
                SKB was deleted from outq->sacked
(but it was held by datamsg at sctp_datamsg_to_asoc
So, sctp_wfree was not called here)

then migrate happened

        sctp_for_each_tx_datachunk(
        sctp_clear_owner_w);
        sctp_assoc_migrate();
        sctp_for_each_tx_datachunk(
        sctp_set_owner_w);
SKB was not in the outq, and was not changed to newsk

finally

__sctp_outq_teardown
        sctp_chunk_put (for another skb)
                sctp_datamsg_put
                        __kfree_skb(msg->frag_list)
                                sctp_wfree (for SKB)
	SKB->sk was still oldsk (skb->sk != asoc->base.sk).

Reported-and-tested-by: syzbot+cea71eec5d6de256d54d@syzkaller.appspotmail.com
Signed-off-by: Qiujun Huang <hqjagain@gmail.com>
Acked-by: Marcelo Ricardo Leitner <mleitner@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 net/sctp/socket.c |   31 +++++++++++++++++++++++--------
 1 file changed, 23 insertions(+), 8 deletions(-)

--- a/net/sctp/socket.c
+++ b/net/sctp/socket.c
@@ -173,29 +173,44 @@ static void sctp_clear_owner_w(struct sc
 	skb_orphan(chunk->skb);
 }
 
+#define traverse_and_process()	\
+do {				\
+	msg = chunk->msg;	\
+	if (msg == prev_msg)	\
+		continue;	\
+	list_for_each_entry(c, &msg->chunks, frag_list) {	\
+		if ((clear && asoc->base.sk == c->skb->sk) ||	\
+		    (!clear && asoc->base.sk != c->skb->sk))	\
+			cb(c);	\
+	}			\
+	prev_msg = msg;		\
+} while (0)
+
 static void sctp_for_each_tx_datachunk(struct sctp_association *asoc,
+				       bool clear,
 				       void (*cb)(struct sctp_chunk *))
 
 {
+	struct sctp_datamsg *msg, *prev_msg = NULL;
 	struct sctp_outq *q = &asoc->outqueue;
+	struct sctp_chunk *chunk, *c;
 	struct sctp_transport *t;
-	struct sctp_chunk *chunk;
 
 	list_for_each_entry(t, &asoc->peer.transport_addr_list, transports)
 		list_for_each_entry(chunk, &t->transmitted, transmitted_list)
-			cb(chunk);
+			traverse_and_process();
 
 	list_for_each_entry(chunk, &q->retransmit, transmitted_list)
-		cb(chunk);
+		traverse_and_process();
 
 	list_for_each_entry(chunk, &q->sacked, transmitted_list)
-		cb(chunk);
+		traverse_and_process();
 
 	list_for_each_entry(chunk, &q->abandoned, transmitted_list)
-		cb(chunk);
+		traverse_and_process();
 
 	list_for_each_entry(chunk, &q->out_chunk_list, list)
-		cb(chunk);
+		traverse_and_process();
 }
 
 /* Verify that this is a valid address. */
@@ -7878,9 +7893,9 @@ static void sctp_sock_migrate(struct soc
 	 * paths won't try to lock it and then oldsk.
 	 */
 	lock_sock_nested(newsk, SINGLE_DEPTH_NESTING);
-	sctp_for_each_tx_datachunk(assoc, sctp_clear_owner_w);
+	sctp_for_each_tx_datachunk(assoc, true, sctp_clear_owner_w);
 	sctp_assoc_migrate(assoc, newsk);
-	sctp_for_each_tx_datachunk(assoc, sctp_set_owner_w);
+	sctp_for_each_tx_datachunk(assoc, false, sctp_set_owner_w);
 
 	/* If the association on the newsk is already closed before accept()
 	 * is called, set RCV_SHUTDOWN flag.

[PATCH 4.9 07/32] sctp: fix possibly using a bad saddr with a given dst

[Greg Kroah-Hartman]

From: Marcelo Ricardo Leitner <marcelo.leitner@gmail.com>

[ Upstream commit 582eea230536a6f104097dd46205822005d5fe3a ]

Under certain circumstances, depending on the order of addresses on the
interfaces, it could be that sctp_v[46]_get_dst() would return a dst
with a mismatched struct flowi.

For example, if when walking through the bind addresses and the first
one is not a match, it saves the dst as a fallback (added in
410f03831c07), but not the flowi. Then if the next one is also not a
match, the previous dst will be returned but with the flowi information
for the 2nd address, which is wrong.

The fix is to use a locally stored flowi that can be used for such
attempts, and copy it to the parameter only in case it is a possible
match, together with the corresponding dst entry.

The patch updates IPv6 code mostly just to be in sync. Even though the issue
is also present there, it fallback is not expected to work with IPv6.

Fixes: 410f03831c07 ("sctp: add routing output fallback")
Reported-by: Jin Meng <meng.a.jin@nokia-sbell.com>
Signed-off-by: Marcelo Ricardo Leitner <marcelo.leitner@gmail.com>
Tested-by: Xin Long <lucien.xin@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 net/sctp/ipv6.c     |   20 ++++++++++++++------
 net/sctp/protocol.c |   28 +++++++++++++++++++---------
 2 files changed, 33 insertions(+), 15 deletions(-)

--- a/net/sctp/ipv6.c
+++ b/net/sctp/ipv6.c
@@ -235,7 +235,8 @@ static void sctp_v6_get_dst(struct sctp_
 {
 	struct sctp_association *asoc = t->asoc;
 	struct dst_entry *dst = NULL;
-	struct flowi6 *fl6 = &fl->u.ip6;
+	struct flowi _fl;
+	struct flowi6 *fl6 = &_fl.u.ip6;
 	struct sctp_bind_addr *bp;
 	struct ipv6_pinfo *np = inet6_sk(sk);
 	struct sctp_sockaddr_entry *laddr;
@@ -245,7 +246,7 @@ static void sctp_v6_get_dst(struct sctp_
 	__u8 matchlen = 0;
 	sctp_scope_t scope;
 
-	memset(fl6, 0, sizeof(struct flowi6));
+	memset(&_fl, 0, sizeof(_fl));
 	fl6->daddr = daddr->v6.sin6_addr;
 	fl6->fl6_dport = daddr->v6.sin6_port;
 	fl6->flowi6_proto = IPPROTO_SCTP;
@@ -269,8 +270,11 @@ static void sctp_v6_get_dst(struct sctp_
 	rcu_read_unlock();
 
 	dst = ip6_dst_lookup_flow(sk, fl6, final_p);
-	if (!asoc || saddr)
+	if (!asoc || saddr) {
+		t->dst = dst;
+		memcpy(fl, &_fl, sizeof(_fl));
 		goto out;
+	}
 
 	bp = &asoc->base.bind_addr;
 	scope = sctp_scope(daddr);
@@ -293,6 +297,8 @@ static void sctp_v6_get_dst(struct sctp_
 			if ((laddr->a.sa.sa_family == AF_INET6) &&
 			    (sctp_v6_cmp_addr(&dst_saddr, &laddr->a))) {
 				rcu_read_unlock();
+				t->dst = dst;
+				memcpy(fl, &_fl, sizeof(_fl));
 				goto out;
 			}
 		}
@@ -331,6 +337,8 @@ static void sctp_v6_get_dst(struct sctp_
 			if (!IS_ERR_OR_NULL(dst))
 				dst_release(dst);
 			dst = bdst;
+			t->dst = dst;
+			memcpy(fl, &_fl, sizeof(_fl));
 			break;
 		}
 
@@ -344,6 +352,8 @@ static void sctp_v6_get_dst(struct sctp_
 			dst_release(dst);
 		dst = bdst;
 		matchlen = bmatchlen;
+		t->dst = dst;
+		memcpy(fl, &_fl, sizeof(_fl));
 	}
 	rcu_read_unlock();
 
@@ -352,14 +362,12 @@ out:
 		struct rt6_info *rt;
 
 		rt = (struct rt6_info *)dst;
-		t->dst = dst;
 		t->dst_cookie = rt6_get_cookie(rt);
 		pr_debug("rt6_dst:%pI6/%d rt6_src:%pI6\n",
 			 &rt->rt6i_dst.addr, rt->rt6i_dst.plen,
-			 &fl6->saddr);
+			 &fl->u.ip6.saddr);
 	} else {
 		t->dst = NULL;
-
 		pr_debug("no route\n");
 	}
 }
--- a/net/sctp/protocol.c
+++ b/net/sctp/protocol.c
@@ -430,14 +430,15 @@ static void sctp_v4_get_dst(struct sctp_
 {
 	struct sctp_association *asoc = t->asoc;
 	struct rtable *rt;
-	struct flowi4 *fl4 = &fl->u.ip4;
+	struct flowi _fl;
+	struct flowi4 *fl4 = &_fl.u.ip4;
 	struct sctp_bind_addr *bp;
 	struct sctp_sockaddr_entry *laddr;
 	struct dst_entry *dst = NULL;
 	union sctp_addr *daddr = &t->ipaddr;
 	union sctp_addr dst_saddr;
 
-	memset(fl4, 0x0, sizeof(struct flowi4));
+	memset(&_fl, 0x0, sizeof(_fl));
 	fl4->daddr  = daddr->v4.sin_addr.s_addr;
 	fl4->fl4_dport = daddr->v4.sin_port;
 	fl4->flowi4_proto = IPPROTO_SCTP;
@@ -455,8 +456,11 @@ static void sctp_v4_get_dst(struct sctp_
 		 &fl4->saddr);
 
 	rt = ip_route_output_key(sock_net(sk), fl4);
-	if (!IS_ERR(rt))
+	if (!IS_ERR(rt)) {
 		dst = &rt->dst;
+		t->dst = dst;
+		memcpy(fl, &_fl, sizeof(_fl));
+	}
 
 	/* If there is no association or if a source address is passed, no
 	 * more validation is required.
@@ -519,27 +523,33 @@ static void sctp_v4_get_dst(struct sctp_
 		odev = __ip_dev_find(sock_net(sk), laddr->a.v4.sin_addr.s_addr,
 				     false);
 		if (!odev || odev->ifindex != fl4->flowi4_oif) {
-			if (!dst)
+			if (!dst) {
 				dst = &rt->dst;
-			else
+				t->dst = dst;
+				memcpy(fl, &_fl, sizeof(_fl));
+			} else {
 				dst_release(&rt->dst);
+			}
 			continue;
 		}
 
 		dst_release(dst);
 		dst = &rt->dst;
+		t->dst = dst;
+		memcpy(fl, &_fl, sizeof(_fl));
 		break;
 	}
 
 out_unlock:
 	rcu_read_unlock();
 out:
-	t->dst = dst;
-	if (dst)
+	if (dst) {
 		pr_debug("rt_dst:%pI4, rt_src:%pI4\n",
-			 &fl4->daddr, &fl4->saddr);
-	else
+			 &fl->u.ip4.daddr, &fl->u.ip4.saddr);
+	} else {
+		t->dst = NULL;
 		pr_debug("no route\n");
+	}
 }
 
 /* For v4, the source address is cached in the route entry(dst). So no need

[PATCH 4.9 08/32] drm/etnaviv: replace MMU flush marker with flush sequence

[Greg Kroah-Hartman]

From: Lucas Stach <l.stach@pengutronix.de>

commit 4900dda90af2cb13bc1d4c12ce94b98acc8fe64e upstream.

If a MMU is shared between multiple GPUs, all of them need to flush their
TLBs, so a single marker that gets reset on the first flush won't do.
Replace the flush marker with a sequence number, so that it's possible to
check if the TLB is in sync with the current page table state for each GPU.

Signed-off-by: Lucas Stach <l.stach@pengutronix.de>
Reviewed-by: Philipp Zabel <p.zabel@pengutronix.de>
Reviewed-by: Guido Günther <agx@sigxcpu.org>
Signed-off-by: Robert Beckett <bob.beckett@collabora.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 drivers/gpu/drm/etnaviv/etnaviv_buffer.c |   10 ++++++----
 drivers/gpu/drm/etnaviv/etnaviv_gpu.c    |    2 +-
 drivers/gpu/drm/etnaviv/etnaviv_gpu.h    |    1 +
 drivers/gpu/drm/etnaviv/etnaviv_mmu.c    |    6 +++---
 drivers/gpu/drm/etnaviv/etnaviv_mmu.h    |    2 +-
 5 files changed, 12 insertions(+), 9 deletions(-)

--- a/drivers/gpu/drm/etnaviv/etnaviv_buffer.c
+++ b/drivers/gpu/drm/etnaviv/etnaviv_buffer.c
@@ -257,6 +257,8 @@ void etnaviv_buffer_queue(struct etnaviv
 	unsigned int waitlink_offset = buffer->user_size - 16;
 	u32 return_target, return_dwords;
 	u32 link_target, link_dwords;
+	unsigned int new_flush_seq = READ_ONCE(gpu->mmu->flush_seq);
+	bool need_flush = gpu->flush_seq != new_flush_seq;
 
 	if (drm_debug & DRM_UT_DRIVER)
 		etnaviv_buffer_dump(gpu, buffer, 0, 0x50);
@@ -269,14 +271,14 @@ void etnaviv_buffer_queue(struct etnaviv
 	 * need to append a mmu flush load state, followed by a new
 	 * link to this buffer - a total of four additional words.
 	 */
-	if (gpu->mmu->need_flush || gpu->switch_context) {
+	if (need_flush || gpu->switch_context) {
 		u32 target, extra_dwords;
 
 		/* link command */
 		extra_dwords = 1;
 
 		/* flush command */
-		if (gpu->mmu->need_flush) {
+		if (need_flush) {
 			if (gpu->mmu->version == ETNAVIV_IOMMU_V1)
 				extra_dwords += 1;
 			else
@@ -289,7 +291,7 @@ void etnaviv_buffer_queue(struct etnaviv
 
 		target = etnaviv_buffer_reserve(gpu, buffer, extra_dwords);
 
-		if (gpu->mmu->need_flush) {
+		if (need_flush) {
 			/* Add the MMU flush */
 			if (gpu->mmu->version == ETNAVIV_IOMMU_V1) {
 				CMD_LOAD_STATE(buffer, VIVS_GL_FLUSH_MMU,
@@ -309,7 +311,7 @@ void etnaviv_buffer_queue(struct etnaviv
 					SYNC_RECIPIENT_PE);
 			}
 
-			gpu->mmu->need_flush = false;
+			gpu->flush_seq = new_flush_seq;
 		}
 
 		if (gpu->switch_context) {
--- a/drivers/gpu/drm/etnaviv/etnaviv_gpu.c
+++ b/drivers/gpu/drm/etnaviv/etnaviv_gpu.c
@@ -1313,7 +1313,7 @@ int etnaviv_gpu_submit(struct etnaviv_gp
 	gpu->active_fence = submit->fence;
 
 	if (gpu->lastctx != cmdbuf->ctx) {
-		gpu->mmu->need_flush = true;
+		gpu->mmu->flush_seq++;
 		gpu->switch_context = true;
 		gpu->lastctx = cmdbuf->ctx;
 	}
--- a/drivers/gpu/drm/etnaviv/etnaviv_gpu.h
+++ b/drivers/gpu/drm/etnaviv/etnaviv_gpu.h
@@ -135,6 +135,7 @@ struct etnaviv_gpu {
 	int irq;
 
 	struct etnaviv_iommu *mmu;
+	unsigned int flush_seq;
 
 	/* Power Control: */
 	struct clk *clk_bus;
--- a/drivers/gpu/drm/etnaviv/etnaviv_mmu.c
+++ b/drivers/gpu/drm/etnaviv/etnaviv_mmu.c
@@ -134,7 +134,7 @@ static int etnaviv_iommu_find_iova(struc
 		 */
 		if (mmu->last_iova) {
 			mmu->last_iova = 0;
-			mmu->need_flush = true;
+			mmu->flush_seq++;
 			continue;
 		}
 
@@ -197,7 +197,7 @@ static int etnaviv_iommu_find_iova(struc
 		 * associated commit requesting this mapping, and retry the
 		 * allocation one more time.
 		 */
-		mmu->need_flush = true;
+		mmu->flush_seq++;
 	}
 
 	return ret;
@@ -354,7 +354,7 @@ u32 etnaviv_iommu_get_cmdbuf_va(struct e
 		 * that the FE MMU prefetch won't load invalid entries.
 		 */
 		mmu->last_iova = buf->vram_node.start + buf->size + SZ_64K;
-		gpu->mmu->need_flush = true;
+		mmu->flush_seq++;
 		mutex_unlock(&mmu->lock);
 
 		return (u32)buf->vram_node.start;
--- a/drivers/gpu/drm/etnaviv/etnaviv_mmu.h
+++ b/drivers/gpu/drm/etnaviv/etnaviv_mmu.h
@@ -44,7 +44,7 @@ struct etnaviv_iommu {
 	struct list_head mappings;
 	struct drm_mm mm;
 	u32 last_iova;
-	bool need_flush;
+	unsigned int flush_seq;
 };
 
 struct etnaviv_gem_object;

[PATCH 4.9 09/32] blk-mq: sync the update nr_hw_queues with blk_mq_queue_tag_busy_iter

[Greg Kroah-Hartman]

From: Jianchao Wang <jianchao.w.wang@oracle.com>

commit f5bbbbe4d63577026f908a809f22f5fd5a90ea1f upstream.

For blk-mq, part_in_flight/rw will invoke blk_mq_in_flight/rw to
account the inflight requests. It will access the queue_hw_ctx and
nr_hw_queues w/o any protection. When updating nr_hw_queues and
blk_mq_in_flight/rw occur concurrently, panic comes up.

Before update nr_hw_queues, the q will be frozen. So we could use
q_usage_counter to avoid the race. percpu_ref_is_zero is used here
so that we will not miss any in-flight request. The access to
nr_hw_queues and queue_hw_ctx in blk_mq_queue_tag_busy_iter are
under rcu critical section, __blk_mq_update_nr_hw_queues could use
synchronize_rcu to ensure the zeroed q_usage_counter to be globally
visible.

Signed-off-by: Jianchao Wang <jianchao.w.wang@oracle.com>
Reviewed-by: Ming Lei <ming.lei@redhat.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Cc: Giuliano Procida <gprocida@google.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 block/blk-mq-tag.c |   14 +++++++++++++-
 block/blk-mq.c     |    4 ++++
 2 files changed, 17 insertions(+), 1 deletion(-)

--- a/block/blk-mq-tag.c
+++ b/block/blk-mq-tag.c
@@ -336,6 +336,18 @@ void blk_mq_queue_tag_busy_iter(struct r
 	struct blk_mq_hw_ctx *hctx;
 	int i;
 
+	/*
+	 * __blk_mq_update_nr_hw_queues will update the nr_hw_queues and
+	 * queue_hw_ctx after freeze the queue. So we could use q_usage_counter
+	 * to avoid race with it. __blk_mq_update_nr_hw_queues will users
+	 * synchronize_rcu to ensure all of the users go out of the critical
+	 * section below and see zeroed q_usage_counter.
+	 */
+	rcu_read_lock();
+	if (percpu_ref_is_zero(&q->q_usage_counter)) {
+		rcu_read_unlock();
+		return;
+	}
 
 	queue_for_each_hw_ctx(q, hctx, i) {
 		struct blk_mq_tags *tags = hctx->tags;
@@ -351,7 +363,7 @@ void blk_mq_queue_tag_busy_iter(struct r
 			bt_for_each(hctx, &tags->breserved_tags, fn, priv, true);
 		bt_for_each(hctx, &tags->bitmap_tags, fn, priv, false);
 	}
-
+	rcu_read_unlock();
 }
 
 static unsigned int bt_unused_tags(const struct sbitmap_queue *bt)
--- a/block/blk-mq.c
+++ b/block/blk-mq.c
@@ -2346,6 +2346,10 @@ void blk_mq_update_nr_hw_queues(struct b
 
 	list_for_each_entry(q, &set->tag_list, tag_set_list)
 		blk_mq_unfreeze_queue(q);
+	/*
+	 * Sync with blk_mq_queue_tag_busy_iter.
+	 */
+	synchronize_rcu();
 }
 EXPORT_SYMBOL_GPL(blk_mq_update_nr_hw_queues);
 

[PATCH 4.9 10/32] blk-mq: Allow blocking queue tag iter callbacks

[Greg Kroah-Hartman]

From: Keith Busch <keith.busch@intel.com>

commit 530ca2c9bd6949c72c9b5cfc330cb3dbccaa3f5b upstream.

A recent commit runs tag iterator callbacks under the rcu read lock,
but existing callbacks do not satisfy the non-blocking requirement.
The commit intended to prevent an iterator from accessing a queue that's
being modified. This patch fixes the original issue by taking a queue
reference instead of reading it, which allows callbacks to make blocking
calls.

Fixes: f5bbbbe4d6357 ("blk-mq: sync the update nr_hw_queues with blk_mq_queue_tag_busy_iter")
Acked-by: Jianchao Wang <jianchao.w.wang@oracle.com>
Signed-off-by: Keith Busch <keith.busch@intel.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Giuliano Procida <gprocida@google.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 block/blk-mq-tag.c |   13 ++++---------
 1 file changed, 4 insertions(+), 9 deletions(-)

--- a/block/blk-mq-tag.c
+++ b/block/blk-mq-tag.c
@@ -338,16 +338,11 @@ void blk_mq_queue_tag_busy_iter(struct r
 
 	/*
 	 * __blk_mq_update_nr_hw_queues will update the nr_hw_queues and
-	 * queue_hw_ctx after freeze the queue. So we could use q_usage_counter
-	 * to avoid race with it. __blk_mq_update_nr_hw_queues will users
-	 * synchronize_rcu to ensure all of the users go out of the critical
-	 * section below and see zeroed q_usage_counter.
+	 * queue_hw_ctx after freeze the queue, so we use q_usage_counter
+	 * to avoid race with it.
 	 */
-	rcu_read_lock();
-	if (percpu_ref_is_zero(&q->q_usage_counter)) {
-		rcu_read_unlock();
+	if (!percpu_ref_tryget(&q->q_usage_counter))
 		return;
-	}
 
 	queue_for_each_hw_ctx(q, hctx, i) {
 		struct blk_mq_tags *tags = hctx->tags;
@@ -363,7 +358,7 @@ void blk_mq_queue_tag_busy_iter(struct r
 			bt_for_each(hctx, &tags->breserved_tags, fn, priv, true);
 		bt_for_each(hctx, &tags->bitmap_tags, fn, priv, false);
 	}
-	rcu_read_unlock();
+	blk_queue_exit(q);
 }
 
 static unsigned int bt_unused_tags(const struct sbitmap_queue *bt)

[PATCH 4.9 11/32] coresight: do not use the BIT() macro in the UAPI header

[Greg Kroah-Hartman]

From: Eugene Syromiatnikov <esyr@redhat.com>

commit 9b6eaaf3db5e5888df7bca7fed7752a90f7fd871 upstream.

The BIT() macro definition is not available for the UAPI headers
(moreover, it can be defined differently in the user space); replace
its usage with the _BITUL() macro that is defined in <linux/const.h>.

Fixes: 237483aa5cf4 ("coresight: stm: adding driver for CoreSight STM component")
Signed-off-by: Eugene Syromiatnikov <esyr@redhat.com>
Cc: stable <stable@vger.kernel.org>
Reviewed-by: Mathieu Poirier <mathieu.poirier@linaro.org>
Link: https://lore.kernel.org/r/20200324042213.GA10452@asgard.redhat.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 include/uapi/linux/coresight-stm.h |    6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

--- a/include/uapi/linux/coresight-stm.h
+++ b/include/uapi/linux/coresight-stm.h
@@ -1,8 +1,10 @@
 #ifndef __UAPI_CORESIGHT_STM_H_
 #define __UAPI_CORESIGHT_STM_H_
 
-#define STM_FLAG_TIMESTAMPED   BIT(3)
-#define STM_FLAG_GUARANTEED    BIT(7)
+#include <linux/const.h>
+
+#define STM_FLAG_TIMESTAMPED   _BITUL(3)
+#define STM_FLAG_GUARANTEED    _BITUL(7)
 
 /*
  * The CoreSight STM supports guaranteed and invariant timing

[PATCH 4.9 12/32] net: dsa: tag_brcm: Fix skb->fwd_offload_mark location

[Greg Kroah-Hartman]

From: Florian Fainelli <f.fainelli@gmail.com>

When the backport of upstream commit
0e62f543bed03a64495bd2651d4fe1aa4bcb7fe5 ("net: dsa: Fix duplicate
frames flooded by learning") was done the assignment of
skb->fwd_offload_mark would land in brcm_tag_xmit() which is incorrect,
it should have been in brcm_tag_rcv().

Fixes: 5e845dc62f38 ("net: dsa: Fix duplicate frames flooded by learning")
Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 net/dsa/tag_brcm.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/net/dsa/tag_brcm.c
+++ b/net/dsa/tag_brcm.c
@@ -84,8 +84,6 @@ static struct sk_buff *brcm_tag_xmit(str
 		brcm_tag[2] = BRCM_IG_DSTMAP2_MASK;
 	brcm_tag[3] = (1 << p->port) & BRCM_IG_DSTMAP1_MASK;
 
-	skb->offload_fwd_mark = 1;
-
 	return skb;
 
 out_free:
@@ -148,6 +146,8 @@ static int brcm_tag_rcv(struct sk_buff *
 	skb->dev->stats.rx_packets++;
 	skb->dev->stats.rx_bytes += skb->len;
 
+	skb->offload_fwd_mark = 1;
+
 	netif_receive_skb(skb);
 
 	return 0;

[PATCH 4.9 13/32] padata: always acquire cpu_hotplug_lock before pinst->lock

[Greg Kroah-Hartman]

From: Daniel Jordan <daniel.m.jordan@oracle.com>

commit 38228e8848cd7dd86ccb90406af32de0cad24be3 upstream.

lockdep complains when padata's paths to update cpumasks via CPU hotplug
and sysfs are both taken:

  # echo 0 > /sys/devices/system/cpu/cpu1/online
  # echo ff > /sys/kernel/pcrypt/pencrypt/parallel_cpumask

  ======================================================
  WARNING: possible circular locking dependency detected
  5.4.0-rc8-padata-cpuhp-v3+ #1 Not tainted
  ------------------------------------------------------
  bash/205 is trying to acquire lock:
  ffffffff8286bcd0 (cpu_hotplug_lock.rw_sem){++++}, at: padata_set_cpumask+0x2b/0x120

  but task is already holding lock:
  ffff8880001abfa0 (&pinst->lock){+.+.}, at: padata_set_cpumask+0x26/0x120

  which lock already depends on the new lock.

padata doesn't take cpu_hotplug_lock and pinst->lock in a consistent
order.  Which should be first?  CPU hotplug calls into padata with
cpu_hotplug_lock already held, so it should have priority.

Fixes: 6751fb3c0e0c ("padata: Use get_online_cpus/put_online_cpus")
Signed-off-by: Daniel Jordan <daniel.m.jordan@oracle.com>
Cc: Eric Biggers <ebiggers@kernel.org>
Cc: Herbert Xu <herbert@gondor.apana.org.au>
Cc: Steffen Klassert <steffen.klassert@secunet.com>
Cc: linux-crypto@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 kernel/padata.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/kernel/padata.c
+++ b/kernel/padata.c
@@ -614,8 +614,8 @@ int padata_set_cpumask(struct padata_ins
 	struct cpumask *serial_mask, *parallel_mask;
 	int err = -EINVAL;
 
-	mutex_lock(&pinst->lock);
 	get_online_cpus();
+	mutex_lock(&pinst->lock);
 
 	switch (cpumask_type) {
 	case PADATA_CPU_PARALLEL:
@@ -633,8 +633,8 @@ int padata_set_cpumask(struct padata_ins
 	err =  __padata_set_cpumasks(pinst, parallel_mask, serial_mask);
 
 out:
-	put_online_cpus();
 	mutex_unlock(&pinst->lock);
+	put_online_cpus();
 
 	return err;
 }

[PATCH 4.9 14/32] mm: mempolicy: require at least one nodeid for MPOL_PREFERRED

[Greg Kroah-Hartman]

From: Randy Dunlap <rdunlap@infradead.org>

commit aa9f7d5172fac9bf1f09e678c35e287a40a7b7dd upstream.

Using an empty (malformed) nodelist that is not caught during mount option
parsing leads to a stack-out-of-bounds access.

The option string that was used was: "mpol=prefer:,".  However,
MPOL_PREFERRED requires a single node number, which is not being provided
here.

Add a check that 'nodes' is not empty after parsing for MPOL_PREFERRED's
nodeid.

Fixes: 095f1fc4ebf3 ("mempolicy: rework shmem mpol parsing and display")
Reported-by: Entropy Moe <3ntr0py1337@gmail.com>
Reported-by: syzbot+b055b1a6b2b958707a21@syzkaller.appspotmail.com
Signed-off-by: Randy Dunlap <rdunlap@infradead.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Tested-by: syzbot+b055b1a6b2b958707a21@syzkaller.appspotmail.com
Cc: Lee Schermerhorn <lee.schermerhorn@hp.com>
Link: http://lkml.kernel.org/r/89526377-7eb6-b662-e1d8-4430928abde9@infradead.org
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 mm/mempolicy.c |    6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

--- a/mm/mempolicy.c
+++ b/mm/mempolicy.c
@@ -2768,7 +2768,9 @@ int mpol_parse_str(char *str, struct mem
 	switch (mode) {
 	case MPOL_PREFERRED:
 		/*
-		 * Insist on a nodelist of one node only
+		 * Insist on a nodelist of one node only, although later
+		 * we use first_node(nodes) to grab a single node, so here
+		 * nodelist (or nodes) cannot be empty.
 		 */
 		if (nodelist) {
 			char *rest = nodelist;
@@ -2776,6 +2778,8 @@ int mpol_parse_str(char *str, struct mem
 				rest++;
 			if (*rest)
 				goto out;
+			if (nodes_empty(nodes))
+				goto out;
 		}
 		break;
 	case MPOL_INTERLEAVE:

[PATCH 4.9 15/32] net: dsa: bcm_sf2: Ensure correct sub-node is parsed

[Greg Kroah-Hartman]

From: Florian Fainelli <f.fainelli@gmail.com>

[ Upstream commit afa3b592953bfaecfb4f2f335ec5f935cff56804 ]

When the bcm_sf2 was converted into a proper platform device driver and
used the new dsa_register_switch() interface, we would still be parsing
the legacy DSA node that contained all the port information since the
platform firmware has intentionally maintained backward and forward
compatibility to client programs. Ensure that we do parse the correct
node, which is "ports" per the revised DSA binding.

Fixes: d9338023fb8e ("net: dsa: bcm_sf2: Make it a real platform device driver")
Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
Reviewed-by: Vivien Didelot <vivien.didelot@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/net/dsa/bcm_sf2.c |    7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

--- a/drivers/net/dsa/bcm_sf2.c
+++ b/drivers/net/dsa/bcm_sf2.c
@@ -976,6 +976,7 @@ static int bcm_sf2_sw_probe(struct platf
 	struct device_node *dn = pdev->dev.of_node;
 	struct b53_platform_data *pdata;
 	struct dsa_switch_ops *ops;
+	struct device_node *ports;
 	struct bcm_sf2_priv *priv;
 	struct b53_device *dev;
 	struct dsa_switch *ds;
@@ -1038,7 +1039,11 @@ static int bcm_sf2_sw_probe(struct platf
 	spin_lock_init(&priv->indir_lock);
 	mutex_init(&priv->stats_mutex);
 
-	bcm_sf2_identify_ports(priv, dn->child);
+	ports = of_find_node_by_name(dn, "ports");
+	if (ports) {
+		bcm_sf2_identify_ports(priv, ports);
+		of_node_put(ports);
+	}
 
 	priv->irq0 = irq_of_parse_and_map(dn, 0);
 	priv->irq1 = irq_of_parse_and_map(dn, 1);

[PATCH 4.9 16/32] net: stmmac: dwmac1000: fix out-of-bounds mac address reg setting

[Greg Kroah-Hartman]

From: Jisheng Zhang <Jisheng.Zhang@synaptics.com>

[ Upstream commit 3e1221acf6a8f8595b5ce354bab4327a69d54d18 ]

Commit 9463c4455900 ("net: stmmac: dwmac1000: Clear unused address
entries") cleared the unused mac address entries, but introduced an
out-of bounds mac address register programming bug -- After setting
the secondary unicast mac addresses, the "reg" value has reached
netdev_uc_count() + 1, thus we should only clear address entries
if (addr < perfect_addr_number)

Fixes: 9463c4455900 ("net: stmmac: dwmac1000: Clear unused address entries")
Signed-off-by: Jisheng Zhang <Jisheng.Zhang@synaptics.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/net/ethernet/stmicro/stmmac/dwmac1000_core.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/net/ethernet/stmicro/stmmac/dwmac1000_core.c
+++ b/drivers/net/ethernet/stmicro/stmmac/dwmac1000_core.c
@@ -214,7 +214,7 @@ static void dwmac1000_set_filter(struct
 			reg++;
 		}
 
-		while (reg <= perfect_addr_number) {
+		while (reg < perfect_addr_number) {
 			writel(0, ioaddr + GMAC_ADDR_HIGH(reg));
 			writel(0, ioaddr + GMAC_ADDR_LOW(reg));
 			reg++;

[PATCH 4.9 17/32] slcan: Dont transmit uninitialized stack data in padding

[Greg Kroah-Hartman]

From: Richard Palethorpe <rpalethorpe@suse.com>

[ Upstream commit b9258a2cece4ec1f020715fe3554bc2e360f6264 ]

struct can_frame contains some padding which is not explicitly zeroed in
slc_bump. This uninitialized data will then be transmitted if the stack
initialization hardening feature is not enabled (CONFIG_INIT_STACK_ALL).

This commit just zeroes the whole struct including the padding.

Signed-off-by: Richard Palethorpe <rpalethorpe@suse.com>
Fixes: a1044e36e457 ("can: add slcan driver for serial/USB-serial CAN adapters")
Reviewed-by: Kees Cook <keescook@chromium.org>
Cc: linux-can@vger.kernel.org
Cc: netdev@vger.kernel.org
Cc: security@kernel.org
Cc: wg@grandegger.com
Cc: mkl@pengutronix.de
Cc: davem@davemloft.net
Acked-by: Marc Kleine-Budde <mkl@pengutronix.de>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/net/can/slcan.c |    4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

--- a/drivers/net/can/slcan.c
+++ b/drivers/net/can/slcan.c
@@ -147,7 +147,7 @@ static void slc_bump(struct slcan *sl)
 	u32 tmpid;
 	char *cmd = sl->rbuff;
 
-	cf.can_id = 0;
+	memset(&cf, 0, sizeof(cf));
 
 	switch (*cmd) {
 	case 'r':
@@ -186,8 +186,6 @@ static void slc_bump(struct slcan *sl)
 	else
 		return;
 
-	*(u64 *) (&cf.data) = 0; /* clear payload */
-
 	/* RTR frames may have a dlc > 0 but they never have any data bytes */
 	if (!(cf.can_id & CAN_RTR_FLAG)) {
 		for (i = 0; i < cf.can_dlc; i++) {

[PATCH 4.9 18/32] net: phy: micrel: kszphy_resume(): add delay after genphy_resume() before accessing PHY registers

[Greg Kroah-Hartman]

From: Oleksij Rempel <o.rempel@pengutronix.de>

[ Upstream commit 6110dff776f7fa65c35850ef65b41d3b39e2fac2 ]

After the power-down bit is cleared, the chip internally triggers a
global reset. According to the KSZ9031 documentation, we have to wait at
least 1ms for the reset to finish.

If the chip is accessed during reset, read will return 0xffff, while
write will be ignored. Depending on the system performance and MDIO bus
speed, we may or may not run in to this issue.

This bug was discovered on an iMX6QP system with KSZ9031 PHY and
attached PHY interrupt line. If IRQ was used, the link status update was
lost. In polling mode, the link status update was always correct.

The investigation showed, that during a read-modify-write access, the
read returned 0xffff (while the chip was still in reset) and
corresponding write hit the chip _after_ reset and triggered (due to the
0xffff) another reset in an undocumented bit (register 0x1f, bit 1),
resulting in the next write being lost due to the new reset cycle.

This patch fixes the issue by adding a 1...2 ms sleep after the
genphy_resume().

Fixes: 836384d2501d ("net: phy: micrel: Add specific suspend")
Signed-off-by: Oleksij Rempel <o.rempel@pengutronix.de>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/net/phy/micrel.c |    7 +++++++
 1 file changed, 7 insertions(+)

--- a/drivers/net/phy/micrel.c
+++ b/drivers/net/phy/micrel.c
@@ -28,6 +28,7 @@
 #include <linux/micrel_phy.h>
 #include <linux/of.h>
 #include <linux/clk.h>
+#include <linux/delay.h>
 
 /* Operation Mode Strap Override */
 #define MII_KSZPHY_OMSO				0x16
@@ -728,6 +729,12 @@ static int kszphy_resume(struct phy_devi
 {
 	genphy_resume(phydev);
 
+	/* After switching from power-down to normal mode, an internal global
+	 * reset is automatically generated. Wait a minimum of 1 ms before
+	 * read/write access to the PHY registers.
+	 */
+	usleep_range(1000, 2000);
+
 	/* Enable PHY Interrupts */
 	if (phy_interrupt_is_valid(phydev)) {
 		phydev->interrupts = PHY_INTERRUPT_ENABLED;

[PATCH 4.9 19/32] random: always use batched entropy for get_random_u{32,64}

[Greg Kroah-Hartman]

From: Jason A. Donenfeld <Jason@zx2c4.com>

commit 69efea712f5b0489e67d07565aad5c94e09a3e52 upstream.

It turns out that RDRAND is pretty slow. Comparing these two
constructions:

  for (i = 0; i < CHACHA_BLOCK_SIZE; i += sizeof(ret))
    arch_get_random_long(&ret);

and

  long buf[CHACHA_BLOCK_SIZE / sizeof(long)];
  extract_crng((u8 *)buf);

it amortizes out to 352 cycles per long for the top one and 107 cycles
per long for the bottom one, on Coffee Lake Refresh, Intel Core i9-9880H.

And importantly, the top one has the drawback of not benefiting from the
real rng, whereas the bottom one has all the nice benefits of using our
own chacha rng. As get_random_u{32,64} gets used in more places (perhaps
beyond what it was originally intended for when it was introduced as
get_random_{int,long} back in the md5 monstrosity era), it seems like it
might be a good thing to strengthen its posture a tiny bit. Doing this
should only be stronger and not any weaker because that pool is already
initialized with a bunch of rdrand data (when available). This way, we
get the benefits of the hardware rng as well as our own rng.

Another benefit of this is that we no longer hit pitfalls of the recent
stream of AMD bugs in RDRAND. One often used code pattern for various
things is:

  do {
  	val = get_random_u32();
  } while (hash_table_contains_key(val));

That recent AMD bug rendered that pattern useless, whereas we're really
very certain that chacha20 output will give pretty distributed numbers,
no matter what.

So, this simplification seems better both from a security perspective
and from a performance perspective.

Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Link: https://lore.kernel.org/r/20200221201037.30231-1-Jason@zx2c4.com
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 drivers/char/random.c |   10 ++--------
 1 file changed, 2 insertions(+), 8 deletions(-)

--- a/drivers/char/random.c
+++ b/drivers/char/random.c
@@ -2118,8 +2118,8 @@ struct batched_entropy {
 
 /*
  * Get a random word for internal kernel use only. The quality of the random
- * number is either as good as RDRAND or as good as /dev/urandom, with the
- * goal of being quite fast and not depleting entropy.
+ * number is good as /dev/urandom, but there is no backtrack protection, with
+ * the goal of being quite fast and not depleting entropy.
  */
 static DEFINE_PER_CPU(struct batched_entropy, batched_entropy_long);
 unsigned long get_random_long(void)
@@ -2127,9 +2127,6 @@ unsigned long get_random_long(void)
 	unsigned long ret;
 	struct batched_entropy *batch;
 
-	if (arch_get_random_long(&ret))
-		return ret;
-
 	batch = &get_cpu_var(batched_entropy_long);
 	if (batch->position % ARRAY_SIZE(batch->entropy_long) == 0) {
 		extract_crng((u8 *)batch->entropy_long);
@@ -2153,9 +2150,6 @@ unsigned int get_random_int(void)
 	unsigned int ret;
 	struct batched_entropy *batch;
 
-	if (arch_get_random_int(&ret))
-		return ret;
-
 	batch = &get_cpu_var(batched_entropy_int);
 	if (batch->position % ARRAY_SIZE(batch->entropy_int) == 0) {
 		extract_crng((u8 *)batch->entropy_int);

[PATCH 4.9 20/32] tools/accounting/getdelays.c: fix netlink attribute length

[Greg Kroah-Hartman]

From: David Ahern <dsahern@kernel.org>

commit 4054ab64e29bb05b3dfe758fff3c38a74ba753bb upstream.

A recent change to the netlink code: 6e237d099fac ("netlink: Relax attr
validation for fixed length types") logs a warning when programs send
messages with invalid attributes (e.g., wrong length for a u32).  Yafang
reported this error message for tools/accounting/getdelays.c.

send_cmd() is wrongly adding 1 to the attribute length.  As noted in
include/uapi/linux/netlink.h nla_len should be NLA_HDRLEN + payload
length, so drop the +1.

Fixes: 9e06d3f9f6b1 ("per task delay accounting taskstats interface: documentation fix")
Reported-by: Yafang Shao <laoar.shao@gmail.com>
Signed-off-by: David Ahern <dsahern@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Tested-by: Yafang Shao <laoar.shao@gmail.com>
Cc: Johannes Berg <johannes@sipsolutions.net>
Cc: Shailabh Nagar <nagar@watson.ibm.com>
Cc: <stable@vger.kernel.org>
Link: http://lkml.kernel.org/r/20200327173111.63922-1-dsahern@kernel.org
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 tools/accounting/getdelays.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/tools/accounting/getdelays.c
+++ b/tools/accounting/getdelays.c
@@ -135,7 +135,7 @@ static int send_cmd(int sd, __u16 nlmsg_
 	msg.g.version = 0x1;
 	na = (struct nlattr *) GENLMSG_DATA(&msg);
 	na->nla_type = nla_type;
-	na->nla_len = nla_len + 1 + NLA_HDRLEN;
+	na->nla_len = nla_len + NLA_HDRLEN;
 	memcpy(NLA_DATA(na), nla_data, nla_len);
 	msg.n.nlmsg_len += NLMSG_ALIGN(na->nla_len);
 

[PATCH 4.9 21/32] ASoC: jz4740-i2s: Fix divider written at incorrect offset in register

[Greg Kroah-Hartman]

From: Paul Cercueil <paul@crapouillou.net>

commit 9401d5aa328e64617d87abd59af1c91cace4c3e4 upstream.

The 4-bit divider value was written at offset 8, while the jz4740
programming manual locates it at offset 0.

Fixes: 26b0aad80a86 ("ASoC: jz4740: Add dynamic sampling rate support to jz4740-i2s")
Signed-off-by: Paul Cercueil <paul@crapouillou.net>
Cc: stable@vger.kernel.org
Link: https://lore.kernel.org/r/20200306222931.39664-2-paul@crapouillou.net
Signed-off-by: Mark Brown <broonie@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 sound/soc/jz4740/jz4740-i2s.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/sound/soc/jz4740/jz4740-i2s.c
+++ b/sound/soc/jz4740/jz4740-i2s.c
@@ -92,7 +92,7 @@
 #define JZ_AIC_I2S_STATUS_BUSY BIT(2)
 
 #define JZ_AIC_CLK_DIV_MASK 0xf
-#define I2SDIV_DV_SHIFT 8
+#define I2SDIV_DV_SHIFT 0
 #define I2SDIV_DV_MASK (0xf << I2SDIV_DV_SHIFT)
 #define I2SDIV_IDV_SHIFT 8
 #define I2SDIV_IDV_MASK (0xf << I2SDIV_IDV_SHIFT)

[PATCH 4.9 22/32] IB/hfi1: Call kobject_put() when kobject_init_and_add() fails

[Greg Kroah-Hartman]

From: Kaike Wan <kaike.wan@intel.com>

commit dfb5394f804ed4fcea1fc925be275a38d66712ab upstream.

When kobject_init_and_add() returns an error in the function
hfi1_create_port_files(), the function kobject_put() is not called for the
corresponding kobject, which potentially leads to memory leak.

This patch fixes the issue by calling kobject_put() even if
kobject_init_and_add() fails.

Cc: <stable@vger.kernel.org>
Link: https://lore.kernel.org/r/20200326163813.21129.44280.stgit@awfm-01.aw.intel.com
Reviewed-by: Mike Marciniszyn <mike.marciniszyn@intel.com>
Signed-off-by: Kaike Wan <kaike.wan@intel.com>
Signed-off-by: Dennis Dalessandro <dennis.dalessandro@intel.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 drivers/infiniband/hw/hfi1/sysfs.c |   13 ++++++++-----
 1 file changed, 8 insertions(+), 5 deletions(-)

--- a/drivers/infiniband/hw/hfi1/sysfs.c
+++ b/drivers/infiniband/hw/hfi1/sysfs.c
@@ -670,7 +670,11 @@ int hfi1_create_port_files(struct ib_dev
 		dd_dev_err(dd,
 			   "Skipping sc2vl sysfs info, (err %d) port %u\n",
 			   ret, port_num);
-		goto bail;
+		/*
+		 * Based on the documentation for kobject_init_and_add(), the
+		 * caller should call kobject_put even if this call fails.
+		 */
+		goto bail_sc2vl;
 	}
 	kobject_uevent(&ppd->sc2vl_kobj, KOBJ_ADD);
 
@@ -680,7 +684,7 @@ int hfi1_create_port_files(struct ib_dev
 		dd_dev_err(dd,
 			   "Skipping sl2sc sysfs info, (err %d) port %u\n",
 			   ret, port_num);
-		goto bail_sc2vl;
+		goto bail_sl2sc;
 	}
 	kobject_uevent(&ppd->sl2sc_kobj, KOBJ_ADD);
 
@@ -690,7 +694,7 @@ int hfi1_create_port_files(struct ib_dev
 		dd_dev_err(dd,
 			   "Skipping vl2mtu sysfs info, (err %d) port %u\n",
 			   ret, port_num);
-		goto bail_sl2sc;
+		goto bail_vl2mtu;
 	}
 	kobject_uevent(&ppd->vl2mtu_kobj, KOBJ_ADD);
 
@@ -700,7 +704,7 @@ int hfi1_create_port_files(struct ib_dev
 		dd_dev_err(dd,
 			   "Skipping Congestion Control sysfs info, (err %d) port %u\n",
 			   ret, port_num);
-		goto bail_vl2mtu;
+		goto bail_cc;
 	}
 
 	kobject_uevent(&ppd->pport_cc_kobj, KOBJ_ADD);
@@ -738,7 +742,6 @@ bail_sl2sc:
 	kobject_put(&ppd->sl2sc_kobj);
 bail_sc2vl:
 	kobject_put(&ppd->sc2vl_kobj);
-bail:
 	return ret;
 }
 

[PATCH 4.9 23/32] IB/hfi1: Fix memory leaks in sysfs registration and unregistration

[Greg Kroah-Hartman]

From: Kaike Wan <kaike.wan@intel.com>

commit 5c15abc4328ad696fa61e2f3604918ed0c207755 upstream.

When the hfi1 driver is unloaded, kmemleak will report the following
issue:

unreferenced object 0xffff8888461a4c08 (size 8):
comm "kworker/0:0", pid 5, jiffies 4298601264 (age 2047.134s)
hex dump (first 8 bytes):
73 64 6d 61 30 00 ff ff sdma0...
backtrace:
[<00000000311a6ef5>] kvasprintf+0x62/0xd0
[<00000000ade94d9f>] kobject_set_name_vargs+0x1c/0x90
[<0000000060657dbb>] kobject_init_and_add+0x5d/0xb0
[<00000000346fe72b>] 0xffffffffa0c5ecba
[<000000006cfc5819>] 0xffffffffa0c866b9
[<0000000031c65580>] 0xffffffffa0c38e87
[<00000000e9739b3f>] local_pci_probe+0x41/0x80
[<000000006c69911d>] work_for_cpu_fn+0x16/0x20
[<00000000601267b5>] process_one_work+0x171/0x380
[<0000000049a0eefa>] worker_thread+0x1d1/0x3f0
[<00000000909cf2b9>] kthread+0xf8/0x130
[<0000000058f5f874>] ret_from_fork+0x35/0x40

This patch fixes the issue by:

- Releasing dd->per_sdma[i].kobject in hfi1_unregister_sysfs().
  - This will fix the memory leak.

- Calling kobject_put() to unwind operations only for those entries in
   dd->per_sdma[] whose operations have succeeded (including the current
   one that has just failed) in hfi1_verbs_register_sysfs().

Cc: <stable@vger.kernel.org>
Fixes: 0cb2aa690c7e ("IB/hfi1: Add sysfs interface for affinity setup")
Link: https://lore.kernel.org/r/20200326163807.21129.27371.stgit@awfm-01.aw.intel.com
Reviewed-by: Mike Marciniszyn <mike.marciniszyn@intel.com>
Signed-off-by: Kaike Wan <kaike.wan@intel.com>
Signed-off-by: Dennis Dalessandro <dennis.dalessandro@intel.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 drivers/infiniband/hw/hfi1/sysfs.c |   13 +++++++++++--
 1 file changed, 11 insertions(+), 2 deletions(-)

--- a/drivers/infiniband/hw/hfi1/sysfs.c
+++ b/drivers/infiniband/hw/hfi1/sysfs.c
@@ -861,8 +861,13 @@ bail:
 	for (i = 0; i < ARRAY_SIZE(hfi1_attributes); ++i)
 		device_remove_file(&dev->dev, hfi1_attributes[i]);
 
-	for (i = 0; i < dd->num_sdma; i++)
-		kobject_del(&dd->per_sdma[i].kobj);
+	/*
+	 * The function kobject_put() will call kobject_del() if the kobject
+	 * has been added successfully. The sysfs files created under the
+	 * kobject directory will also be removed during the process.
+	 */
+	for (; i >= 0; i--)
+		kobject_put(&dd->per_sdma[i].kobj);
 
 	return ret;
 }
@@ -875,6 +880,10 @@ void hfi1_verbs_unregister_sysfs(struct
 	struct hfi1_pportdata *ppd;
 	int i;
 
+	/* Unwind operations in hfi1_verbs_register_sysfs() */
+	for (i = 0; i < dd->num_sdma; i++)
+		kobject_put(&dd->per_sdma[i].kobj);
+
 	for (i = 0; i < dd->num_pports; i++) {
 		ppd = &dd->pport[i];
 

[PATCH 4.9 24/32] ceph: remove the extra slashes in the server path

[Greg Kroah-Hartman]

From: Xiubo Li <xiubli@redhat.com>

commit 4fbc0c711b2464ee1551850b85002faae0b775d5 upstream.

It's possible to pass the mount helper a server path that has more
than one contiguous slash character. For example:

  $ mount -t ceph 192.168.195.165:40176:/// /mnt/cephfs/

In the MDS server side the extra slashes of the server path will be
treated as snap dir, and then we can get the following debug logs:

  ceph:  mount opening path //
  ceph:  open_root_inode opening '//'
  ceph:  fill_trace 0000000059b8a3bc is_dentry 0 is_target 1
  ceph:  alloc_inode 00000000dc4ca00b
  ceph:  get_inode created new inode 00000000dc4ca00b 1.ffffffffffffffff ino 1
  ceph:  get_inode on 1=1.ffffffffffffffff got 00000000dc4ca00b

And then when creating any new file or directory under the mount
point, we can hit the following BUG_ON in ceph_fill_trace():

  BUG_ON(ceph_snap(dir) != dvino.snap);

Have the client ignore the extra slashes in the server path when
mounting. This will also canonicalize the path, so that identical mounts
can be consilidated.

1) "//mydir1///mydir//"
2) "/mydir1/mydir"
3) "/mydir1/mydir/"

Regardless of the internal treatment of these paths, the kernel still
stores the original string including the leading '/' for presentation
to userland.

URL: https://tracker.ceph.com/issues/42771
Signed-off-by: Xiubo Li <xiubli@redhat.com>
Reviewed-by: Jeff Layton <jlayton@kernel.org>
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
Signed-off-by: Luis Henriques <lhenriques@suse.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 fs/ceph/super.c |  118 ++++++++++++++++++++++++++++++++++++++++++++++----------
 1 file changed, 99 insertions(+), 19 deletions(-)

--- a/fs/ceph/super.c
+++ b/fs/ceph/super.c
@@ -85,7 +85,6 @@ static int ceph_statfs(struct dentry *de
 	return 0;
 }
 
-
 static int ceph_sync_fs(struct super_block *sb, int wait)
 {
 	struct ceph_fs_client *fsc = ceph_sb_to_client(sb);
@@ -321,6 +320,73 @@ static int strcmp_null(const char *s1, c
 	return strcmp(s1, s2);
 }
 
+/**
+ * path_remove_extra_slash - Remove the extra slashes in the server path
+ * @server_path: the server path and could be NULL
+ *
+ * Return NULL if the path is NULL or only consists of "/", or a string
+ * without any extra slashes including the leading slash(es) and the
+ * slash(es) at the end of the server path, such as:
+ * "//dir1////dir2///" --> "dir1/dir2"
+ */
+static char *path_remove_extra_slash(const char *server_path)
+{
+	const char *path = server_path;
+	const char *cur, *end;
+	char *buf, *p;
+	int len;
+
+	/* if the server path is omitted */
+	if (!path)
+		return NULL;
+
+	/* remove all the leading slashes */
+	while (*path == '/')
+		path++;
+
+	/* if the server path only consists of slashes */
+	if (*path == '\0')
+		return NULL;
+
+	len = strlen(path);
+
+	buf = kmalloc(len + 1, GFP_KERNEL);
+	if (!buf)
+		return ERR_PTR(-ENOMEM);
+
+	end = path + len;
+	p = buf;
+	do {
+		cur = strchr(path, '/');
+		if (!cur)
+			cur = end;
+
+		len = cur - path;
+
+		/* including one '/' */
+		if (cur != end)
+			len += 1;
+
+		memcpy(p, path, len);
+		p += len;
+
+		while (cur <= end && *cur == '/')
+			cur++;
+		path = cur;
+	} while (path < end);
+
+	*p = '\0';
+
+	/*
+	 * remove the last slash if there has and just to make sure that
+	 * we will get something like "dir1/dir2"
+	 */
+	if (*(--p) == '/')
+		*p = '\0';
+
+	return buf;
+}
+
 static int compare_mount_options(struct ceph_mount_options *new_fsopt,
 				 struct ceph_options *new_opt,
 				 struct ceph_fs_client *fsc)
@@ -328,6 +394,7 @@ static int compare_mount_options(struct
 	struct ceph_mount_options *fsopt1 = new_fsopt;
 	struct ceph_mount_options *fsopt2 = fsc->mount_options;
 	int ofs = offsetof(struct ceph_mount_options, snapdir_name);
+	char *p1, *p2;
 	int ret;
 
 	ret = memcmp(fsopt1, fsopt2, ofs);
@@ -341,7 +408,17 @@ static int compare_mount_options(struct
 	if (ret)
 		return ret;
 
-	ret = strcmp_null(fsopt1->server_path, fsopt2->server_path);
+	p1 = path_remove_extra_slash(fsopt1->server_path);
+	if (IS_ERR(p1))
+		return PTR_ERR(p1);
+	p2 = path_remove_extra_slash(fsopt2->server_path);
+	if (IS_ERR(p2)) {
+		kfree(p1);
+		return PTR_ERR(p2);
+	}
+	ret = strcmp_null(p1, p2);
+	kfree(p1);
+	kfree(p2);
 	if (ret)
 		return ret;
 
@@ -396,12 +473,14 @@ static int parse_mount_options(struct ce
 	 */
 	dev_name_end = strchr(dev_name, '/');
 	if (dev_name_end) {
-		if (strlen(dev_name_end) > 1) {
-			fsopt->server_path = kstrdup(dev_name_end, GFP_KERNEL);
-			if (!fsopt->server_path) {
-				err = -ENOMEM;
-				goto out;
-			}
+		/*
+		 * The server_path will include the whole chars from userland
+		 * including the leading '/'.
+		 */
+		fsopt->server_path = kstrdup(dev_name_end, GFP_KERNEL);
+		if (!fsopt->server_path) {
+			err = -ENOMEM;
+			goto out;
 		}
 	} else {
 		dev_name_end = dev_name + strlen(dev_name);
@@ -725,7 +804,6 @@ static void destroy_caches(void)
 	ceph_fscache_unregister();
 }
 
-
 /*
  * ceph_umount_begin - initiate forced umount.  Tear down down the
  * mount, skipping steps that may hang while waiting for server(s).
@@ -812,9 +890,6 @@ out:
 	return root;
 }
 
-
-
-
 /*
  * mount: join the ceph cluster, and open root directory.
  */
@@ -828,24 +903,29 @@ static struct dentry *ceph_real_mount(st
 	mutex_lock(&fsc->client->mount_mutex);
 
 	if (!fsc->sb->s_root) {
-		const char *path;
+		const char *path, *p;
 		err = __ceph_open_session(fsc->client, started);
 		if (err < 0)
 			goto out;
 
-		if (!fsc->mount_options->server_path) {
-			path = "";
-			dout("mount opening path \\t\n");
-		} else {
-			path = fsc->mount_options->server_path + 1;
-			dout("mount opening path %s\n", path);
+		p = path_remove_extra_slash(fsc->mount_options->server_path);
+		if (IS_ERR(p)) {
+			err = PTR_ERR(p);
+			goto out;
 		}
+		/* if the server path is omitted or just consists of '/' */
+		if (!p)
+			path = "";
+		else
+			path = p;
+		dout("mount opening path '%s'\n", path);
 
 		err = ceph_fs_debugfs_init(fsc);
 		if (err < 0)
 			goto out;
 
 		root = open_root_dentry(fsc, path, started);
+		kfree(p);
 		if (IS_ERR(root)) {
 			err = PTR_ERR(root);
 			goto out;

[PATCH 4.9 25/32] ceph: canonicalize server path in place

[Greg Kroah-Hartman]

From: Ilya Dryomov <idryomov@gmail.com>

commit b27a939e8376a3f1ed09b9c33ef44d20f18ec3d0 upstream.

syzbot reported that 4fbc0c711b24 ("ceph: remove the extra slashes in
the server path") had caused a regression where an allocation could be
done under a spinlock -- compare_mount_options() is called by sget_fc()
with sb_lock held.

We don't really need the supplied server path, so canonicalize it
in place and compare it directly.  To make this work, the leading
slash is kept around and the logic in ceph_real_mount() to skip it
is restored.  CEPH_MSG_CLIENT_SESSION now reports the same (i.e.
canonicalized) path, with the leading slash of course.

Fixes: 4fbc0c711b24 ("ceph: remove the extra slashes in the server path")
Reported-by: syzbot+98704a51af8e3d9425a9@syzkaller.appspotmail.com
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
Reviewed-by: Jeff Layton <jlayton@kernel.org>
Signed-off-by: Luis Henriques <lhenriques@suse.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 fs/ceph/super.c |  118 ++++++++++++--------------------------------------------
 fs/ceph/super.h |    2 
 2 files changed, 28 insertions(+), 92 deletions(-)

--- a/fs/ceph/super.c
+++ b/fs/ceph/super.c
@@ -177,6 +177,26 @@ static match_table_t fsopt_tokens = {
 	{-1, NULL}
 };
 
+/*
+ * Remove adjacent slashes and then the trailing slash, unless it is
+ * the only remaining character.
+ *
+ * E.g. "//dir1////dir2///" --> "/dir1/dir2", "///" --> "/".
+ */
+static void canonicalize_path(char *path)
+{
+	int i, j = 0;
+
+	for (i = 0; path[i] != '\0'; i++) {
+		if (path[i] != '/' || j < 1 || path[j - 1] != '/')
+			path[j++] = path[i];
+	}
+
+	if (j > 1 && path[j - 1] == '/')
+		j--;
+	path[j] = '\0';
+}
+
 static int parse_fsopt_token(char *c, void *private)
 {
 	struct ceph_mount_options *fsopt = private;
@@ -320,73 +340,6 @@ static int strcmp_null(const char *s1, c
 	return strcmp(s1, s2);
 }
 
-/**
- * path_remove_extra_slash - Remove the extra slashes in the server path
- * @server_path: the server path and could be NULL
- *
- * Return NULL if the path is NULL or only consists of "/", or a string
- * without any extra slashes including the leading slash(es) and the
- * slash(es) at the end of the server path, such as:
- * "//dir1////dir2///" --> "dir1/dir2"
- */
-static char *path_remove_extra_slash(const char *server_path)
-{
-	const char *path = server_path;
-	const char *cur, *end;
-	char *buf, *p;
-	int len;
-
-	/* if the server path is omitted */
-	if (!path)
-		return NULL;
-
-	/* remove all the leading slashes */
-	while (*path == '/')
-		path++;
-
-	/* if the server path only consists of slashes */
-	if (*path == '\0')
-		return NULL;
-
-	len = strlen(path);
-
-	buf = kmalloc(len + 1, GFP_KERNEL);
-	if (!buf)
-		return ERR_PTR(-ENOMEM);
-
-	end = path + len;
-	p = buf;
-	do {
-		cur = strchr(path, '/');
-		if (!cur)
-			cur = end;
-
-		len = cur - path;
-
-		/* including one '/' */
-		if (cur != end)
-			len += 1;
-
-		memcpy(p, path, len);
-		p += len;
-
-		while (cur <= end && *cur == '/')
-			cur++;
-		path = cur;
-	} while (path < end);
-
-	*p = '\0';
-
-	/*
-	 * remove the last slash if there has and just to make sure that
-	 * we will get something like "dir1/dir2"
-	 */
-	if (*(--p) == '/')
-		*p = '\0';
-
-	return buf;
-}
-
 static int compare_mount_options(struct ceph_mount_options *new_fsopt,
 				 struct ceph_options *new_opt,
 				 struct ceph_fs_client *fsc)
@@ -394,7 +347,6 @@ static int compare_mount_options(struct
 	struct ceph_mount_options *fsopt1 = new_fsopt;
 	struct ceph_mount_options *fsopt2 = fsc->mount_options;
 	int ofs = offsetof(struct ceph_mount_options, snapdir_name);
-	char *p1, *p2;
 	int ret;
 
 	ret = memcmp(fsopt1, fsopt2, ofs);
@@ -404,21 +356,12 @@ static int compare_mount_options(struct
 	ret = strcmp_null(fsopt1->snapdir_name, fsopt2->snapdir_name);
 	if (ret)
 		return ret;
+
 	ret = strcmp_null(fsopt1->mds_namespace, fsopt2->mds_namespace);
 	if (ret)
 		return ret;
 
-	p1 = path_remove_extra_slash(fsopt1->server_path);
-	if (IS_ERR(p1))
-		return PTR_ERR(p1);
-	p2 = path_remove_extra_slash(fsopt2->server_path);
-	if (IS_ERR(p2)) {
-		kfree(p1);
-		return PTR_ERR(p2);
-	}
-	ret = strcmp_null(p1, p2);
-	kfree(p1);
-	kfree(p2);
+	ret = strcmp_null(fsopt1->server_path, fsopt2->server_path);
 	if (ret)
 		return ret;
 
@@ -482,6 +425,8 @@ static int parse_mount_options(struct ce
 			err = -ENOMEM;
 			goto out;
 		}
+
+		canonicalize_path(fsopt->server_path);
 	} else {
 		dev_name_end = dev_name + strlen(dev_name);
 	}
@@ -903,21 +848,13 @@ static struct dentry *ceph_real_mount(st
 	mutex_lock(&fsc->client->mount_mutex);
 
 	if (!fsc->sb->s_root) {
-		const char *path, *p;
+		const char *path = fsc->mount_options->server_path ?
+				     fsc->mount_options->server_path + 1 : "";
+
 		err = __ceph_open_session(fsc->client, started);
 		if (err < 0)
 			goto out;
 
-		p = path_remove_extra_slash(fsc->mount_options->server_path);
-		if (IS_ERR(p)) {
-			err = PTR_ERR(p);
-			goto out;
-		}
-		/* if the server path is omitted or just consists of '/' */
-		if (!p)
-			path = "";
-		else
-			path = p;
 		dout("mount opening path '%s'\n", path);
 
 		err = ceph_fs_debugfs_init(fsc);
@@ -925,7 +862,6 @@ static struct dentry *ceph_real_mount(st
 			goto out;
 
 		root = open_root_dentry(fsc, path, started);
-		kfree(p);
 		if (IS_ERR(root)) {
 			err = PTR_ERR(root);
 			goto out;
--- a/fs/ceph/super.h
+++ b/fs/ceph/super.h
@@ -70,7 +70,7 @@ struct ceph_mount_options {
 
 	char *snapdir_name;   /* default ".snap" */
 	char *mds_namespace;  /* default NULL */
-	char *server_path;    /* default  "/" */
+	char *server_path;    /* default NULL (means "/") */
 };
 
 struct ceph_fs_client {

[PATCH 4.9 26/32] Bluetooth: RFCOMM: fix ODEBUG bug in rfcomm_dev_ioctl

[Greg Kroah-Hartman]

From: Qiujun Huang <hqjagain@gmail.com>

commit 71811cac8532b2387b3414f7cd8fe9e497482864 upstream.

Needn't call 'rfcomm_dlc_put' here, because 'rfcomm_dlc_exists' didn't
increase dlc->refcnt.

Reported-by: syzbot+4496e82090657320efc6@syzkaller.appspotmail.com
Signed-off-by: Qiujun Huang <hqjagain@gmail.com>
Suggested-by: Hillf Danton <hdanton@sina.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 net/bluetooth/rfcomm/tty.c |    4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

--- a/net/bluetooth/rfcomm/tty.c
+++ b/net/bluetooth/rfcomm/tty.c
@@ -413,10 +413,8 @@ static int __rfcomm_create_dev(struct so
 		dlc = rfcomm_dlc_exists(&req.src, &req.dst, req.channel);
 		if (IS_ERR(dlc))
 			return PTR_ERR(dlc);
-		else if (dlc) {
-			rfcomm_dlc_put(dlc);
+		if (dlc)
 			return -EBUSY;
-		}
 		dlc = rfcomm_dlc_alloc(GFP_KERNEL);
 		if (!dlc)
 			return -ENOMEM;

[PATCH 4.9 27/32] RDMA/cm: Update num_paths in cma_resolve_iboe_route error flow

[Greg Kroah-Hartman]

From: Avihai Horon <avihaih@mellanox.com>

commit 987914ab841e2ec281a35b54348ab109b4c0bb4e upstream.

After a successful allocation of path_rec, num_paths is set to 1, but any
error after such allocation will leave num_paths uncleared.

This causes to de-referencing a NULL pointer later on. Hence, num_paths
needs to be set back to 0 if such an error occurs.

The following crash from syzkaller revealed it.

  kasan: CONFIG_KASAN_INLINE enabled
  kasan: GPF could be caused by NULL-ptr deref or user memory access
  general protection fault: 0000 [#1] SMP DEBUG_PAGEALLOC KASAN PTI
  CPU: 0 PID: 357 Comm: syz-executor060 Not tainted 4.18.0+ #311
  Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS
  rel-1.11.0-0-g63451fca13-prebuilt.qemu-project.org 04/01/2014
  RIP: 0010:ib_copy_path_rec_to_user+0x94/0x3e0
  Code: f1 f1 f1 f1 c7 40 0c 00 00 f4 f4 65 48 8b 04 25 28 00 00 00 48 89
  45 c8 31 c0 e8 d7 60 24 ff 48 8d 7b 4c 48 89 f8 48 c1 e8 03 <42> 0f b6
  14 30 48 89 f8 83 e0 07 83 c0 03 38 d0 7c 08 84 d2 0f 85
  RSP: 0018:ffff88006586f980 EFLAGS: 00010207
  RAX: 0000000000000009 RBX: 0000000000000000 RCX: 1ffff1000d5fe475
  RDX: ffff8800621e17c0 RSI: ffffffff820d45f9 RDI: 000000000000004c
  RBP: ffff88006586fa50 R08: ffffed000cb0df73 R09: ffffed000cb0df72
  R10: ffff88006586fa70 R11: ffffed000cb0df73 R12: 1ffff1000cb0df30
  R13: ffff88006586fae8 R14: dffffc0000000000 R15: ffff88006aff2200
  FS: 00000000016fc880(0000) GS:ffff88006d000000(0000)
  knlGS:0000000000000000
  CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
  CR2: 0000000020000040 CR3: 0000000063fec000 CR4: 00000000000006b0
  DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
  DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
  Call Trace:
  ? ib_copy_path_rec_from_user+0xcc0/0xcc0
  ? __mutex_unlock_slowpath+0xfc/0x670
  ? wait_for_completion+0x3b0/0x3b0
  ? ucma_query_route+0x818/0xc60
  ucma_query_route+0x818/0xc60
  ? ucma_listen+0x1b0/0x1b0
  ? sched_clock_cpu+0x18/0x1d0
  ? sched_clock_cpu+0x18/0x1d0
  ? ucma_listen+0x1b0/0x1b0
  ? ucma_write+0x292/0x460
  ucma_write+0x292/0x460
  ? ucma_close_id+0x60/0x60
  ? sched_clock_cpu+0x18/0x1d0
  ? sched_clock_cpu+0x18/0x1d0
  __vfs_write+0xf7/0x620
  ? ucma_close_id+0x60/0x60
  ? kernel_read+0x110/0x110
  ? time_hardirqs_on+0x19/0x580
  ? lock_acquire+0x18b/0x3a0
  ? finish_task_switch+0xf3/0x5d0
  ? _raw_spin_unlock_irq+0x29/0x40
  ? _raw_spin_unlock_irq+0x29/0x40
  ? finish_task_switch+0x1be/0x5d0
  ? __switch_to_asm+0x34/0x70
  ? __switch_to_asm+0x40/0x70
  ? security_file_permission+0x172/0x1e0
  vfs_write+0x192/0x460
  ksys_write+0xc6/0x1a0
  ? __ia32_sys_read+0xb0/0xb0
  ? entry_SYSCALL_64_after_hwframe+0x3e/0xbe
  ? do_syscall_64+0x1d/0x470
  do_syscall_64+0x9e/0x470
  entry_SYSCALL_64_after_hwframe+0x49/0xbe

Fixes: 3c86aa70bf67 ("RDMA/cm: Add RDMA CM support for IBoE devices")
Link: https://lore.kernel.org/r/20200318101741.47211-1-leon@kernel.org
Signed-off-by: Avihai Horon <avihaih@mellanox.com>
Reviewed-by: Maor Gottlieb <maorg@mellanox.com>
Signed-off-by: Leon Romanovsky <leonro@mellanox.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 drivers/infiniband/core/cma.c |    1 +
 1 file changed, 1 insertion(+)

--- a/drivers/infiniband/core/cma.c
+++ b/drivers/infiniband/core/cma.c
@@ -2568,6 +2568,7 @@ static int cma_resolve_iboe_route(struct
 err2:
 	kfree(route->path_rec);
 	route->path_rec = NULL;
+	route->num_paths = 0;
 err1:
 	kfree(work);
 	return ret;

[PATCH 4.9 28/32] clk: qcom: rcg: Return failure for RCG update

[Greg Kroah-Hartman]

From: Taniya Das <tdas@codeaurora.org>

commit 21ea4b62e1f3dc258001a68da98c9663a9dbd6c7 upstream.

In case of update config failure, return -EBUSY, so that consumers could
handle the failure gracefully.

Signed-off-by: Taniya Das <tdas@codeaurora.org>
Link: https://lkml.kernel.org/r/1557339895-21952-2-git-send-email-tdas@codeaurora.org
Signed-off-by: Stephen Boyd <sboyd@kernel.org>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 drivers/clk/qcom/clk-rcg2.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/clk/qcom/clk-rcg2.c
+++ b/drivers/clk/qcom/clk-rcg2.c
@@ -107,7 +107,7 @@ static int update_config(struct clk_rcg2
 	}
 
 	WARN(1, "%s: rcg didn't update its configuration.", name);
-	return 0;
+	return -EBUSY;
 }
 
 static int clk_rcg2_set_parent(struct clk_hw *hw, u8 index)

[PATCH 4.9 29/32] drm/msm: stop abusing dma_map/unmap for cache

[Greg Kroah-Hartman]

From: Rob Clark <robdclark@chromium.org>

commit 0036bc73ccbe7e600a3468bf8e8879b122252274 upstream.

Recently splats like this started showing up:

   WARNING: CPU: 4 PID: 251 at drivers/iommu/dma-iommu.c:451 __iommu_dma_unmap+0xb8/0xc0
   Modules linked in: ath10k_snoc ath10k_core fuse msm ath mac80211 uvcvideo cfg80211 videobuf2_vmalloc videobuf2_memops vide
   CPU: 4 PID: 251 Comm: kworker/u16:4 Tainted: G        W         5.2.0-rc5-next-20190619+ #2317
   Hardware name: LENOVO 81JL/LNVNB161216, BIOS 9UCN23WW(V1.06) 10/25/2018
   Workqueue: msm msm_gem_free_work [msm]
   pstate: 80c00005 (Nzcv daif +PAN +UAO)
   pc : __iommu_dma_unmap+0xb8/0xc0
   lr : __iommu_dma_unmap+0x54/0xc0
   sp : ffff0000119abce0
   x29: ffff0000119abce0 x28: 0000000000000000
   x27: ffff8001f9946648 x26: ffff8001ec271068
   x25: 0000000000000000 x24: ffff8001ea3580a8
   x23: ffff8001f95ba010 x22: ffff80018e83ba88
   x21: ffff8001e548f000 x20: fffffffffffff000
   x19: 0000000000001000 x18: 00000000c00001fe
   x17: 0000000000000000 x16: 0000000000000000
   x15: ffff000015b70068 x14: 0000000000000005
   x13: 0003142cc1be1768 x12: 0000000000000001
   x11: ffff8001f6de9100 x10: 0000000000000009
   x9 : ffff000015b78000 x8 : 0000000000000000
   x7 : 0000000000000001 x6 : fffffffffffff000
   x5 : 0000000000000fff x4 : ffff00001065dbc8
   x3 : 000000000000000d x2 : 0000000000001000
   x1 : fffffffffffff000 x0 : 0000000000000000
   Call trace:
    __iommu_dma_unmap+0xb8/0xc0
    iommu_dma_unmap_sg+0x98/0xb8
    put_pages+0x5c/0xf0 [msm]
    msm_gem_free_work+0x10c/0x150 [msm]
    process_one_work+0x1e0/0x330
    worker_thread+0x40/0x438
    kthread+0x12c/0x130
    ret_from_fork+0x10/0x18
   ---[ end trace afc0dc5ab81a06bf ]---

Not quite sure what triggered that, but we really shouldn't be abusing
dma_{map,unmap}_sg() for cache maint.

Cc: Stephen Boyd <sboyd@kernel.org>
Tested-by: Stephen Boyd <swboyd@chromium.org>
Reviewed-by: Jordan Crouse <jcrouse@codeaurora.org>
Signed-off-by: Rob Clark <robdclark@chromium.org>
Signed-off-by: Sean Paul <seanpaul@chromium.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20190630124735.27786-1-robdclark@gmail.com
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 drivers/gpu/drm/msm/msm_gem.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/drivers/gpu/drm/msm/msm_gem.c
+++ b/drivers/gpu/drm/msm/msm_gem.c
@@ -106,7 +106,7 @@ static struct page **get_pages(struct dr
 		 * because display controller, GPU, etc. are not coherent:
 		 */
 		if (msm_obj->flags & (MSM_BO_WC|MSM_BO_UNCACHED))
-			dma_map_sg(dev->dev, msm_obj->sgt->sgl,
+			dma_sync_sg_for_device(dev->dev, msm_obj->sgt->sgl,
 					msm_obj->sgt->nents, DMA_BIDIRECTIONAL);
 	}
 
@@ -124,7 +124,7 @@ static void put_pages(struct drm_gem_obj
 			 * GPU, etc. are not coherent:
 			 */
 			if (msm_obj->flags & (MSM_BO_WC|MSM_BO_UNCACHED))
-				dma_unmap_sg(obj->dev->dev, msm_obj->sgt->sgl,
+				dma_sync_sg_for_cpu(obj->dev->dev, msm_obj->sgt->sgl,
 					     msm_obj->sgt->nents,
 					     DMA_BIDIRECTIONAL);
 

[PATCH 4.9 30/32] arm64: Fix size of __early_cpu_boot_status

[Greg Kroah-Hartman]

From: Arun KS <arunks@codeaurora.org>

commit 61cf61d81e326163ce1557ceccfca76e11d0e57c upstream.

__early_cpu_boot_status is of type long. Use quad
assembler directive to allocate proper size.

Acked-by: Mark Rutland <mark.rutland@arm.com>
Signed-off-by: Arun KS <arunks@codeaurora.org>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 arch/arm64/kernel/head.S |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/arch/arm64/kernel/head.S
+++ b/arch/arm64/kernel/head.S
@@ -650,7 +650,7 @@ ENTRY(__boot_cpu_mode)
  * with MMU turned off.
  */
 ENTRY(__early_cpu_boot_status)
-	.long 	0
+	.quad 	0
 
 	.popsection
 

[PATCH 4.9 31/32] usb: dwc3: dont set gadget->is_otg flag

[Greg Kroah-Hartman]

From: Roger Quadros <rogerq@ti.com>

commit c09b73cfac2a9317f1104169045c519c6021aa1d upstream.

This reverts
commit 6a4290cc28be1 ("usb: dwc3: gadget: set the OTG flag in dwc3 gadget driver.")

We don't yet support any of the OTG mechanisms (HNP/SRP/ADP)
and are not setting gadget->otg_caps, so don't set gadget->is_otg
flag.

If we do then we end up publishing a OTG1.0 descriptor in
the gadget descriptor which causes device enumeration to fail
if we are connected to a host with CONFIG_USB_OTG enabled.

Host side log without this patch

[   96.720453] usb 1-1: new high-speed USB device number 2 using xhci-hcd
[   96.901391] usb 1-1: Dual-Role OTG device on non-HNP port
[   96.907552] usb 1-1: set a_alt_hnp_support failed: -32
[   97.060447] usb 1-1: new high-speed USB device number 3 using xhci-hcd
[   97.241378] usb 1-1: Dual-Role OTG device on non-HNP port
[   97.247536] usb 1-1: set a_alt_hnp_support failed: -32
[   97.253606] usb usb1-port1: attempt power cycle
[   97.960449] usb 1-1: new high-speed USB device number 4 using xhci-hcd
[   98.141383] usb 1-1: Dual-Role OTG device on non-HNP port
[   98.147540] usb 1-1: set a_alt_hnp_support failed: -32
[   98.300453] usb 1-1: new high-speed USB device number 5 using xhci-hcd
[   98.481391] usb 1-1: Dual-Role OTG device on non-HNP port
[   98.487545] usb 1-1: set a_alt_hnp_support failed: -32
[   98.493532] usb usb1-port1: unable to enumerate USB device

Signed-off-by: Roger Quadros <rogerq@ti.com>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/usb/dwc3/gadget.c |    1 -
 1 file changed, 1 deletion(-)

--- a/drivers/usb/dwc3/gadget.c
+++ b/drivers/usb/dwc3/gadget.c
@@ -2996,7 +2996,6 @@ int dwc3_gadget_init(struct dwc3 *dwc)
 	dwc->gadget.speed		= USB_SPEED_UNKNOWN;
 	dwc->gadget.sg_supported	= true;
 	dwc->gadget.name		= "dwc3-gadget";
-	dwc->gadget.is_otg		= dwc->dr_mode == USB_DR_MODE_OTG;
 
 	/*
 	 * FIXME We might be setting max_speed to <SUPER, however versions

[PATCH 4.9 32/32] drm_dp_mst_topology: fix broken drm_dp_sideband_parse_remote_dpcd_read()

[Greg Kroah-Hartman]

From: Hans Verkuil <hans.verkuil@cisco.com>

commit a4c30a4861c54af78c4eb8b7855524c1a96d9f80 upstream.

When parsing the reply of a DP_REMOTE_DPCD_READ DPCD command the
result is wrong due to a missing idx increment.

This was never noticed since DP_REMOTE_DPCD_READ is currently not
used, but if you enable it, then it is all wrong.

Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Reviewed-by: Lyude Paul <lyude@redhat.com>
Acked-by: Alex Deucher <alexander.deucher@amd.com>
Link: https://patchwork.freedesktop.org/patch/msgid/e72ddac2-1dc0-100a-d816-9ac98ac009dd@xs4all.nl
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 drivers/gpu/drm/drm_dp_mst_topology.c |    1 +
 1 file changed, 1 insertion(+)

--- a/drivers/gpu/drm/drm_dp_mst_topology.c
+++ b/drivers/gpu/drm/drm_dp_mst_topology.c
@@ -431,6 +431,7 @@ static bool drm_dp_sideband_parse_remote
 	if (idx > raw->curlen)
 		goto fail_len;
 	repmsg->u.remote_dpcd_read_ack.num_bytes = raw->msg[idx];
+	idx++;
 	if (idx > raw->curlen)
 		goto fail_len;
 

Re: [PATCH 4.9 00/32] 4.9.219-rc1 review

[Guenter Roeck]

On 4/11/20 5:08 AM, Greg Kroah-Hartman wrote:
> This is the start of the stable review cycle for the 4.9.219 release.
> There are 32 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 Mon, 13 Apr 2020 11:51:28 +0000.
> Anything received after that time might be too late.
> 

Build results:
	total: 171 pass: 171 fail: 0
Qemu test results:
	total: 384 pass: 384 fail: 0

Guenter

Re: [PATCH 4.9 00/32] 4.9.219-rc1 review

[Naresh Kamboju]

On Sat, 11 Apr 2020 at 17:43, Greg Kroah-Hartman
<gregkh@linuxfoundation.org> wrote:
>
> This is the start of the stable review cycle for the 4.9.219 release.
> There are 32 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 Mon, 13 Apr 2020 11:51:28 +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-4.9.219-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-4.9.y
> and the diffstat can be found below.
>
> thanks,
>
> greg k-h

Results from Linaro’s test farm.
No regressions on arm64, arm, x86_64, and i386.

Summary
------------------------------------------------------------------------

kernel: 4.9.219-rc1
git repo: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable-rc.git
git branch: linux-4.9.y
git commit: ed218652c6a621a6c9bc9655eefed3c460f93d83
git describe: v4.9.218-33-ged218652c6a6
Test details: https://qa-reports.linaro.org/lkft/linux-stable-rc-4.9-oe/build/v4.9.218-33-ged218652c6a6

No regressions (compared to build v4.9.218)

No fixes (compared to build v4.9.218)

Ran 28926 total tests in the following environments and test suites.

Environments
--------------
- dragonboard-410c - arm64
- hi6220-hikey - arm64
- i386
- juno-r2 - arm64
- juno-r2-compat
- juno-r2-kasan
- qemu_arm
- qemu_arm64
- qemu_i386
- qemu_x86_64
- x15 - arm
- x86_64
- x86-kasan

Test Suites
-----------
* build
* install-android-platform-tools-r2600
* install-android-platform-tools-r2800
* kselftest
* kvm-unit-tests
* libhugetlbfs
* linux-log-parser
* ltp-cap_bounds-tests
* ltp-commands-tests
* ltp-containers-tests
* ltp-cpuhotplug-tests
* ltp-crypto-tests
* ltp-cve-tests
* ltp-dio-tests
* ltp-fcntl-locktests-tests
* ltp-filecaps-tests
* ltp-fs-tests
* ltp-fs_bind-tests
* ltp-fs_perms_simple-tests
* ltp-fsx-tests
* ltp-hugetlb-tests
* ltp-io-tests
* ltp-ipc-tests
* ltp-math-tests
* ltp-mm-tests
* ltp-nptl-tests
* ltp-pty-tests
* ltp-securebits-tests
* ltp-syscalls-tests
* perf
* v4l2-compliance
* ltp-sched-tests
* network-basic-tests
* ltp-open-posix-tests
* spectre-meltdown-checker-test
* kselftest-vsyscall-mode-native
* kselftest-vsyscall-mode-none

-- 
Linaro LKFT
https://lkft.linaro.org

Re: [PATCH 4.9 00/32] 4.9.219-rc1 review

[Jon Hunter]

On 11/04/2020 13:08, Greg Kroah-Hartman wrote:
> This is the start of the stable review cycle for the 4.9.219 release.
> There are 32 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 Mon, 13 Apr 2020 11:51:28 +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-4.9.219-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-4.9.y
> and the diffstat can be found below.
> 
> thanks,
> 
> greg k-h

All tests are passing for Tegra ...

Test results for stable-v4.9:
    8 builds:	8 pass, 0 fail
    16 boots:	16 pass, 0 fail
    24 tests:	24 pass, 0 fail

Linux version:	4.9.219-rc1-ged218652c6a6
Boards tested:	tegra124-jetson-tk1, tegra20-ventana,
                tegra210-p2371-2180, tegra30-cardhu-a04

Cheers
Jon

-- 
nvpublic

Re: [PATCH 4.9 00/32] 4.9.219-rc1 review

[Jon Hunter]

On 11/04/2020 13:08, Greg Kroah-Hartman wrote:
> This is the start of the stable review cycle for the 4.9.219 release.
> There are 32 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 Mon, 13 Apr 2020 11:51:28 +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-4.9.219-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-4.9.y
> and the diffstat can be found below.
> 
> thanks,
> 
> greg k-h

All tests are passing for Tegra ...

Test results for stable-v4.9:
    8 builds:	8 pass, 0 fail
    16 boots:	16 pass, 0 fail
    24 tests:	24 pass, 0 fail

Linux version:	4.9.219-rc1-ged218652c6a6
Boards tested:	tegra124-jetson-tk1, tegra20-ventana,
                tegra210-p2371-2180, tegra30-cardhu-a04

Cheers
Jon

-- 
nvpublic