Re: [PATCH 0/4] ALSA: pcm: Fix ioctl races

[Jaroslav Kysela]

On 22. 03. 22 18:07, Takashi Iwai wrote:
> Hi,
>
> this is a patch set to address the recently reported bug for the racy
> PCM ioctls.  In short, the current ALSA PCM core doesn't take enough
> care of concurrent ioctl calls, and the concurrent calls may result in
> a use-after-free.  The reported problem was the concurrent hw_free
> calls, but there can be similar cases with other code paths like
> hw_params, prepare, etc, too.
>
> The patch set introduces the new runtime->buffer_mutex for protecting
> those.  The first patch is the fix for the reported issue (the races
> with hw_free), while the rest three are more hardening for the other
> similar executions.

Thank you Takashi.

Reviewed-by: Jaroslav Kysela <perex@xxxxxxxx>

--
Jaroslav Kysela <perex@xxxxxxxx>
Linux Sound Maintainer; ALSA Project; Red Hat, Inc.