On Mon, Nov 27, 2017 at 10:45:01AM -0500, Adam Wallis wrote:
> Commit adfa543e7314 ("dmatest: don't use set_freezable_with_signal()")
> introduced a bug (that is in fact documented by the patch commit text)
> that leaves behind a dangling pointer. Since the done_wait structure is
> allocated on the stack, future invocations to the DMATEST can produce
> undesirable results (e.g., corrupted spinlocks).
>
> Commit a9df21e34b42 ("dmaengine: dmatest: warn user when dma test times
> out") attempted to WARN the user that the stack was likely corrupted but
> did not fix the actual issue.
>
> This patch fixes the issue by pushing the wait queue and callback
> structs into the the thread structure. If a failure occurs due to time,
> dmaengine_terminate_all will force the callback to safely call
> wake_up_all() without possibility of using a freed pointer.
Applied, thanks
--
~Vinod
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