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SubjectRe: [PATCH] net/usb: cancel pending work when unbinding smsc75xx
From
From: Yu Zhao <yuzhao@google.com>
Date: Fri, 28 Sep 2018 17:04:30 -0600

> Cancel pending work before freeing smsc75xx private data structure
> during binding. This fixes the following crash in the driver:
>
> BUG: unable to handle kernel NULL pointer dereference at 0000000000000050
> IP: mutex_lock+0x2b/0x3f
> <snipped>
> Workqueue: events smsc75xx_deferred_multicast_write [smsc75xx]
> task: ffff8caa83e85700 task.stack: ffff948b80518000
> RIP: 0010:mutex_lock+0x2b/0x3f
> <snipped>
> Call Trace:
> smsc75xx_deferred_multicast_write+0x40/0x1af [smsc75xx]
> process_one_work+0x18d/0x2fc
> worker_thread+0x1a2/0x269
> ? pr_cont_work+0x58/0x58
> kthread+0xfa/0x10a
> ? pr_cont_work+0x58/0x58
> ? rcu_read_unlock_sched_notrace+0x48/0x48
> ret_from_fork+0x22/0x40
>
> Signed-off-by: Yu Zhao <yuzhao@google.com>

Applied and queued up for -stable.

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