[alsa-devel] [PATCH v2 12/12] ASoC: Fix use-after-free at card unregistration

[Robert Jarzmik]

Takashi Iwai <tiwai at suse.de> writes:

> On Mon, 19 Jun 2017 09:27:09 +0200,
> Robert Jarzmik wrote:
>> 
>> From: Takashi Iwai <tiwai at suse.de>
>> 
>> soc_cleanup_card_resources() call snd_card_free() at the last of its
>> procedure.  This turned out to lead to a use-after-free.
>> PCM runtimes have been already removed via soc_remove_pcm_runtimes(),
>> while it's dereferenced later in soc_pcm_free() called via
>> snd_card_free().
>> 
>> The fix is simple: just move the snd_card_free() call to the beginning
>> of the whole procedure.  This also gives another benefit: it
>> guarantees that all operations have been shut down before actually
>> releasing the resources, which was racy until now.
>> 
>> Reported-and-tested-by: Robert Jarzmik <robert.jarzmik at free.fr>
>> Cc: <stable at vger.kernel.org>
>> Signed-off-by: Takashi Iwai <tiwai at suse.de>
>
> This patch must be superfluous :)
Haha :)

My serie shifted by one, so the very first of the serie is therefore missing,
formerly "ALSA: ac97: split out the generic ac97 registers" in
https://patchwork.kernel.org/patch/9398143/, and the shift triggered the
inclusion of the last patch of my tree, ie. yours :)

Cheers.

--
Robert