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Re: [PATCH] auxdisplay: ht16k33: fix potential user-after-free on module unload

On Fri, Feb 8, 2019 at 7:15 PM Miguel Ojeda
<miguel.ojeda.sandonis@xxxxxxxxx> wrote:
> On module unload/remove, we need to ensure that work does not run
> after we have freed resources. Concretely, cancel_delayed_work()
> may return while the callback function is still running.
> From kernel/workqueue.c:
>     The work callback function may still be running on return,
>     unless it returns true and the work doesn't re-arm itself.
>     Explicitly flush or use cancel_delayed_work_sync() to wait on it.
> Link: https://lore.kernel.org/lkml/20190204220952.30761-1-TheSven73@xxxxxxxxxxxxxx/
> Reported-by: Sven Van Asbroeck <thesven73@xxxxxxxxx>
> Signed-off-by: Miguel Ojeda <miguel.ojeda.sandonis@xxxxxxxxx>

Yes, this should do the trick.

Reviewed-by: Sven Van Asbroeck <TheSven73@xxxxxxxxx>