Re: [PATCH v4] tpm: fix an invalid condition in tpm_common_poll

[Jarkko Sakkinen]

On Wed, Mar 27, 2019 at 11:32:38AM -0700, Tadeusz Struk wrote:
> The poll condition should only check response_length,
> because reads should only be issued if there is data to read.
> The response_read flag only prevents double writes.
> The problem was that the write set the response_read to false,
> enqued a tpm job, and returned. Then application called poll
> which checked the response_read flag and returned EPOLLIN.
> Then the application called read, but got nothing.
> After all that the async_work kicked in.
> Added also mutex_lock around the poll check to prevent
> other possible race conditions.
> 
> Cc: stable@xxxxxxxxxxxxxxx
> Fixes: 9488585b21bef0df12 ("tpm: add support for partial reads")
> Reported-by: Mantas MikulÄnas <grawity@xxxxxxxxx>
> Tested-by: Mantas MikulÄnas <grawity@xxxxxxxxx>
> Signed-off-by: Tadeusz Struk <tadeusz.struk@xxxxxxxxx>

Reviewed-by: Jarkko Sakkinen <jarkko.sakkinen@xxxxxxxxxxxxxxx>

Thank you, it is applied.

/Jarkko