Re: [PATCH v5 2/3] tty: fix data race in tty_buffer_flush

[Peter Hurley]

On Thu, Sep 17, 2015 at 11:17 AM, Dmitry Vyukov <dvyukov@xxxxxxxxxx> wrote:
> tty_buffer_flush frees not acquired buffers.
> As the result, for example, read of b->size in tty_buffer_free
> can return garbage value which will lead to a huge buffer
> hanging in the freelist. This is just the benignest
> manifestation of freeing of a not acquired object.
> If the object is passed to kfree, heap can be corrupted.
>
> Acquire visibility over the buffer before freeing it.
>
> The data race was found with KernelThreadSanitizer (KTSAN).

Reviewed-by: Peter Hurley <peter@xxxxxxxxxxxxxxxxxx>
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