usbnet: avoid a possible crash in dql_completed()

syzbot reported a crash [1] in dql_completed() after recent usbnet
BQL adoption.

The reason for the crash is that netdev_reset_queue() is called too soon.

It should be called after cancel_work_sync(&dev->bh_work) to make
sure no more TX completion can happen.

[1]
kernel BUG at lib/dynamic_queue_limits.c:99 !
Oops: invalid opcode: 0000 [#1] SMP KASAN PTI
CPU: 1 UID: 0 PID: 5197 Comm: udevd Tainted: G             L      syzkaller #0 PREEMPT(full)
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
 RIP: 0010:dql_completed+0xbe1/0xbf0 lib/dynamic_queue_limits.c:99
Call Trace:
 <IRQ>
  netdev_tx_completed_queue include/linux/netdevice.h:3864 [inline]
  netdev_completed_queue include/linux/netdevice.h:3894 [inline]
  usbnet_bh+0x793/0x1020 drivers/net/usb/usbnet.c:1601
  process_one_work kernel/workqueue.c:3257 [inline]
  process_scheduled_works+0xad1/0x1770 kernel/workqueue.c:3340
  bh_worker+0x2b1/0x600 kernel/workqueue.c:3611
  tasklet_action+0xc/0x70 kernel/softirq.c:952
  handle_softirqs+0x27d/0x850 kernel/softirq.c:622
  __do_softirq kernel/softirq.c:656 [inline]
  invoke_softirq kernel/softirq.c:496 [inline]
  __irq_exit_rcu+0xca/0x1f0 kernel/softirq.c:723
  irq_exit_rcu+0x9/0x30 kernel/softirq.c:739

Fixes: 7ff14c52049e ("usbnet: Add support for Byte Queue Limits (BQL)")
Reported-by: syzbot+5b55e49f8bbd84631a9c@syzkaller.appspotmail.com
Closes: https://lore.kernel.org/netdev/6945644f.a70a0220.207337.0113.GAE@google.com/T/#u
Signed-off-by: Eric Dumazet <edumazet@google.com>
Cc: Simon Schippers <simon.schippers@tu-dortmund.de>
Link: https://patch.msgid.link/20251219144459.692715-1-edumazet@google.com
Signed-off-by: Paolo Abeni <pabeni@redhat.com>

diff --git a/drivers/net/usb/usbnet.c b/drivers/net/usb/usbnet.c
index 1d9faa70ba3b7f0d6442d77d33a36b190b2cd10d..36742e64cff750cacc2dbb72cf836ff0958b4895 100644 (file)
--- a/drivers/net/usb/usbnet.c
+++ b/drivers/net/usb/usbnet.c
@@ -831,7 +831,6 @@ int usbnet_stop(struct net_device *net)
 
        clear_bit(EVENT_DEV_OPEN, &dev->flags);
        netif_stop_queue(net);
-       netdev_reset_queue(net);
 
        netif_info(dev, ifdown, dev->net,
                   "stop stats: rx/tx %lu/%lu, errs %lu/%lu\n",
@@ -875,6 +874,8 @@ int usbnet_stop(struct net_device *net)
        timer_delete_sync(&dev->delay);
        cancel_work_sync(&dev->kevent);
 
+       netdev_reset_queue(net);
+
        if (!pm)
                usb_autopm_put_interface(dev->intf);