From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To: linux-kernel@vger.kernel.org
Cc: "Greg Kroah-Hartman" <gregkh@linuxfoundation.org>,
stable@vger.kernel.org, "Bjørn Mork" <bjorn@mork.no>,
"David S. Miller" <davem@davemloft.net>,
"Sasha Levin" <sashal@kernel.org>
Subject: [PATCH 4.4 31/62] net: qmi_wwan: should hold RTNL while changing netdev type
Date: Fri, 11 Sep 2020 14:46:14 +0200 [thread overview]
Message-ID: <20200911122503.945511729@linuxfoundation.org> (raw)
In-Reply-To: <20200911122502.395450276@linuxfoundation.org>
From: Bjørn Mork <bjorn@mork.no>
[ Upstream commit 6c730080e663b1d629f8aa89348291fbcdc46cd9 ]
The notifier calls were thrown in as a last-minute fix for an
imagined "this device could be part of a bridge" problem. That
revealed a certain lack of locking. Not to mention testing...
Avoid this splat:
RTNL: assertion failed at net/core/dev.c (1639)
CPU: 0 PID: 4293 Comm: bash Not tainted 4.4.0-rc3+ #358
Hardware name: LENOVO 2776LEG/2776LEG, BIOS 6EET55WW (3.15 ) 12/19/2011
0000000000000000 ffff8800ad253d60 ffffffff8122f7cf ffff8800ad253d98
ffff8800ad253d88 ffffffff813833ab 0000000000000002 ffff880230f48560
ffff880230a12900 ffff8800ad253da0 ffffffff813833da 0000000000000002
Call Trace:
[<ffffffff8122f7cf>] dump_stack+0x4b/0x63
[<ffffffff813833ab>] call_netdevice_notifiers_info+0x3d/0x59
[<ffffffff813833da>] call_netdevice_notifiers+0x13/0x15
[<ffffffffa09be227>] raw_ip_store+0x81/0x193 [qmi_wwan]
[<ffffffff8131e149>] dev_attr_store+0x20/0x22
[<ffffffff811d858b>] sysfs_kf_write+0x49/0x50
[<ffffffff811d8027>] kernfs_fop_write+0x10a/0x151
[<ffffffff8117249a>] __vfs_write+0x26/0xa5
[<ffffffff81085ed4>] ? percpu_down_read+0x53/0x7f
[<ffffffff81174c9e>] ? __sb_start_write+0x5f/0xb0
[<ffffffff81174c9e>] ? __sb_start_write+0x5f/0xb0
[<ffffffff81172c37>] vfs_write+0xa3/0xe7
[<ffffffff811734ad>] SyS_write+0x50/0x7e
[<ffffffff8145c517>] entry_SYSCALL_64_fastpath+0x12/0x6f
Fixes: 32f7adf633b9 ("net: qmi_wwan: support "raw IP" mode")
Signed-off-by: Bjørn Mork <bjorn@mork.no>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/net/usb/qmi_wwan.c | 22 +++++++++++++++-------
1 file changed, 15 insertions(+), 7 deletions(-)
diff --git a/drivers/net/usb/qmi_wwan.c b/drivers/net/usb/qmi_wwan.c
index d6ecb3ac25b6c..e75e984483bc5 100644
--- a/drivers/net/usb/qmi_wwan.c
+++ b/drivers/net/usb/qmi_wwan.c
@@ -16,6 +16,7 @@
#include <linux/etherdevice.h>
#include <linux/if_arp.h>
#include <linux/mii.h>
+#include <linux/rtnetlink.h>
#include <linux/usb.h>
#include <linux/usb/cdc.h>
#include <linux/usb/usbnet.h>
@@ -92,7 +93,7 @@ static ssize_t raw_ip_store(struct device *d, struct device_attribute *attr, co
struct usbnet *dev = netdev_priv(to_net_dev(d));
struct qmi_wwan_state *info = (void *)&dev->data;
bool enable;
- int err;
+ int ret;
if (strtobool(buf, &enable))
return -EINVAL;
@@ -101,18 +102,22 @@ static ssize_t raw_ip_store(struct device *d, struct device_attribute *attr, co
if (enable == (info->flags & QMI_WWAN_FLAG_RAWIP))
return len;
+ if (!rtnl_trylock())
+ return restart_syscall();
+
/* we don't want to modify a running netdev */
if (netif_running(dev->net)) {
netdev_err(dev->net, "Cannot change a running device\n");
- return -EBUSY;
+ ret = -EBUSY;
+ goto err;
}
/* let other drivers deny the change */
- err = call_netdevice_notifiers(NETDEV_PRE_TYPE_CHANGE, dev->net);
- err = notifier_to_errno(err);
- if (err) {
+ ret = call_netdevice_notifiers(NETDEV_PRE_TYPE_CHANGE, dev->net);
+ ret = notifier_to_errno(ret);
+ if (ret) {
netdev_err(dev->net, "Type change was refused\n");
- return err;
+ goto err;
}
if (enable)
@@ -121,7 +126,10 @@ static ssize_t raw_ip_store(struct device *d, struct device_attribute *attr, co
info->flags &= ~QMI_WWAN_FLAG_RAWIP;
qmi_wwan_netdev_setup(dev->net);
call_netdevice_notifiers(NETDEV_POST_TYPE_CHANGE, dev->net);
- return len;
+ ret = len;
+err:
+ rtnl_unlock();
+ return ret;
}
static DEVICE_ATTR_RW(raw_ip);
--
2.25.1
next prev parent reply other threads:[~2020-09-11 13:11 UTC|newest]
Thread overview: 66+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-09-11 12:45 [PATCH 4.4 00/62] 4.4.236-rc1 review Greg Kroah-Hartman
2020-09-11 12:45 ` [PATCH 4.4 01/62] HID: core: Correctly handle ReportSize being zero Greg Kroah-Hartman
2020-09-11 12:45 ` [PATCH 4.4 02/62] HID: core: Sanitize event code and type when mapping input Greg Kroah-Hartman
2020-09-11 12:45 ` [PATCH 4.4 03/62] perf record/stat: Explicitly call out event modifiers in the documentation Greg Kroah-Hartman
2020-09-11 12:45 ` [PATCH 4.4 04/62] mm, page_alloc: remove unnecessary variable from free_pcppages_bulk Greg Kroah-Hartman
2020-09-11 12:45 ` [PATCH 4.4 05/62] hwmon: (applesmc) check status earlier Greg Kroah-Hartman
2020-09-11 12:45 ` [PATCH 4.4 06/62] ceph: dont allow setlease on cephfs Greg Kroah-Hartman
2020-09-11 12:45 ` [PATCH 4.4 07/62] s390: dont trace preemption in percpu macros Greg Kroah-Hartman
2020-09-11 12:45 ` [PATCH 4.4 08/62] xen/xenbus: Fix granting of vmallocd memory Greg Kroah-Hartman
2020-09-11 12:45 ` [PATCH 4.4 09/62] dmaengine: of-dma: Fix of_dma_router_xlates of_dma_xlate handling Greg Kroah-Hartman
2020-09-11 12:45 ` [PATCH 4.4 10/62] batman-adv: Avoid uninitialized chaddr when handling DHCP Greg Kroah-Hartman
2020-09-11 12:45 ` [PATCH 4.4 11/62] batman-adv: bla: use netif_rx_ni when not in interrupt context Greg Kroah-Hartman
2020-09-11 12:45 ` [PATCH 4.4 12/62] dmaengine: at_hdmac: check return value of of_find_device_by_node() in at_dma_xlate() Greg Kroah-Hartman
2020-09-11 12:45 ` [PATCH 4.4 13/62] netfilter: nf_tables: incorrect enum nft_list_attributes definition Greg Kroah-Hartman
2020-09-11 12:45 ` [PATCH 4.4 14/62] netfilter: nf_tables: fix destination register zeroing Greg Kroah-Hartman
2020-09-11 12:45 ` [PATCH 4.4 15/62] dmaengine: pl330: Fix burst length if burst size is smaller than bus width Greg Kroah-Hartman
2020-09-11 12:45 ` [PATCH 4.4 16/62] bnxt_en: Check for zero dir entries in NVRAM Greg Kroah-Hartman
2020-09-11 12:46 ` [PATCH 4.4 17/62] fix regression in "epoll: Keep a reference on files added to the check list" Greg Kroah-Hartman
2020-09-11 12:46 ` [PATCH 4.4 18/62] tg3: Fix soft lockup when tg3_reset_task() fails Greg Kroah-Hartman
2020-09-11 12:46 ` [PATCH 4.4 19/62] iommu/vt-d: Serialize IOMMU GCMD register modifications Greg Kroah-Hartman
2020-09-11 12:46 ` [PATCH 4.4 20/62] thermal: ti-soc-thermal: Fix bogus thermal shutdowns for omap4430 Greg Kroah-Hartman
2020-09-11 12:46 ` [PATCH 4.4 21/62] include/linux/log2.h: add missing () around n in roundup_pow_of_two() Greg Kroah-Hartman
2020-09-11 12:46 ` [PATCH 4.4 22/62] btrfs: drop path before adding new uuid tree entry Greg Kroah-Hartman
2020-09-11 12:46 ` [PATCH 4.4 23/62] btrfs: Remove redundant extent_buffer_get in get_old_root Greg Kroah-Hartman
2020-09-11 12:46 ` [PATCH 4.4 24/62] btrfs: Remove extraneous extent_buffer_get from tree_mod_log_rewind Greg Kroah-Hartman
2020-09-11 12:46 ` [PATCH 4.4 25/62] btrfs: set the lockdep class for log tree extent buffers Greg Kroah-Hartman
2020-09-11 12:46 ` [PATCH 4.4 26/62] uaccess: Add non-pagefault user-space read functions Greg Kroah-Hartman
2020-09-11 12:46 ` [PATCH 4.4 27/62] uaccess: Add non-pagefault user-space write function Greg Kroah-Hartman
2020-09-11 12:46 ` [PATCH 4.4 28/62] btrfs: fix potential deadlock in the search ioctl Greg Kroah-Hartman
2020-09-11 12:46 ` [PATCH 4.4 29/62] net: qmi_wwan: MDM9x30 specific power management Greg Kroah-Hartman
2020-09-11 12:46 ` [PATCH 4.4 30/62] net: qmi_wwan: support "raw IP" mode Greg Kroah-Hartman
2020-09-11 12:46 ` Greg Kroah-Hartman [this message]
2020-09-11 12:46 ` [PATCH 4.4 32/62] net: qmi_wwan: ignore bogus CDC Union descriptors Greg Kroah-Hartman
2020-09-11 12:46 ` [PATCH 4.4 33/62] Add Dell Wireless 5809e Gobi 4G HSPA+ Mobile Broadband Card (rev3) to qmi_wwan Greg Kroah-Hartman
2020-09-11 12:46 ` [PATCH 4.4 34/62] qmi_wwan: Added support for Gemaltos Cinterion PHxx WWAN interface Greg Kroah-Hartman
2020-09-11 12:46 ` [PATCH 4.4 35/62] qmi_wwan: add support for Quectel EC21 and EC25 Greg Kroah-Hartman
2020-09-11 12:46 ` [PATCH 4.4 36/62] NET: usb: qmi_wwan: add support for Telit LE922A PID 0x1040 Greg Kroah-Hartman
2020-09-11 12:46 ` [PATCH 4.4 37/62] drivers: net: usb: qmi_wwan: add QMI_QUIRK_SET_DTR for Telit PID 0x1201 Greg Kroah-Hartman
2020-09-11 12:46 ` [PATCH 4.4 38/62] usb: qmi_wwan: add D-Link DWM-222 A2 device ID Greg Kroah-Hartman
2020-09-11 12:46 ` [PATCH 4.4 39/62] net: usb: qmi_wwan: add Telit ME910 support Greg Kroah-Hartman
2020-09-11 12:46 ` [PATCH 4.4 40/62] net: usb: qmi_wwan: add Telit 0x1050 composition Greg Kroah-Hartman
2020-09-11 12:46 ` [PATCH 4.4 41/62] ALSA: ca0106: fix error code handling Greg Kroah-Hartman
2020-09-11 12:46 ` [PATCH 4.4 42/62] ALSA: pcm: oss: Remove superfluous WARN_ON() for mulaw sanity check Greg Kroah-Hartman
2020-09-11 12:46 ` [PATCH 4.4 43/62] dm cache metadata: Avoid returning cmd->bm wild pointer on error Greg Kroah-Hartman
2020-09-11 12:46 ` [PATCH 4.4 44/62] dm thin " Greg Kroah-Hartman
2020-09-11 12:46 ` [PATCH 4.4 45/62] net: refactor bind_bucket fastreuse into helper Greg Kroah-Hartman
2020-09-11 12:46 ` [PATCH 4.4 46/62] net: initialize fastreuse on inet_inherit_port Greg Kroah-Hartman
2020-09-11 12:46 ` [PATCH 4.4 47/62] checkpatch: fix the usage of capture group ( ... ) Greg Kroah-Hartman
2020-09-11 12:46 ` [PATCH 4.4 48/62] mm/hugetlb: fix a race between hugetlb sysctl handlers Greg Kroah-Hartman
2020-09-11 12:46 ` [PATCH 4.4 49/62] cfg80211: regulatory: reject invalid hints Greg Kroah-Hartman
2020-09-11 12:46 ` [PATCH 4.4 50/62] net: usb: Fix uninit-was-stored issue in asix_read_phy_addr() Greg Kroah-Hartman
2020-09-11 12:46 ` [PATCH 4.4 51/62] ALSA: firewire-digi00x: add support for console models of Digi00x series Greg Kroah-Hartman
2020-09-11 12:46 ` [PATCH 4.4 52/62] ALSA: firewire-digi00x: exclude Avid Adrenaline from detection Greg Kroah-Hartman
2020-09-11 12:46 ` [PATCH 4.4 53/62] ALSA; firewire-tascam: exclude Tascam FE-8 " Greg Kroah-Hartman
2020-09-11 12:46 ` [PATCH 4.4 54/62] fs/affs: use octal for permissions Greg Kroah-Hartman
2020-09-11 12:46 ` [PATCH 4.4 55/62] affs: fix basic permission bits to actually work Greg Kroah-Hartman
2020-09-11 12:46 ` [PATCH 4.4 56/62] ravb: Fixed to be able to unload modules Greg Kroah-Hartman
2020-09-11 12:46 ` [PATCH 4.4 57/62] net: ethernet: mlx4: Fix memory allocation in mlx4_buddy_init() Greg Kroah-Hartman
2020-09-11 12:46 ` [PATCH 4.4 58/62] bnxt_en: Failure to update PHY is not fatal condition Greg Kroah-Hartman
2020-09-11 12:46 ` [PATCH 4.4 59/62] bnxt: dont enable NAPI until rings are ready Greg Kroah-Hartman
2020-09-11 12:46 ` [PATCH 4.4 60/62] net: usb: dm9601: Add USB ID of Keenetic Plus DSL Greg Kroah-Hartman
2020-09-11 12:46 ` [PATCH 4.4 61/62] sctp: not disable bh in the whole sctp_get_port_local() Greg Kroah-Hartman
2020-09-11 12:46 ` [PATCH 4.4 62/62] net: disable netpoll on fresh napis Greg Kroah-Hartman
2020-09-11 22:36 ` [PATCH 4.4 00/62] 4.4.236-rc1 review Shuah Khan
2020-09-12 2:15 ` Guenter Roeck
2020-09-12 8:08 ` Naresh Kamboju
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20200911122503.945511729@linuxfoundation.org \
--to=gregkh@linuxfoundation.org \
--cc=bjorn@mork.no \
--cc=davem@davemloft.net \
--cc=linux-kernel@vger.kernel.org \
--cc=sashal@kernel.org \
--cc=stable@vger.kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).