[PATCH] ALSA: mixer: oss: Fix racy access to slots

[Jaroslav Kysela]

On 20. 10. 21 18:48, Takashi Iwai wrote:
> The OSS mixer can reassign the mapping slots dynamically via proc
> file.  Although the addition and deletion of those slots are protected
> by mixer->reg_mutex, the access to slots aren't, hence this may cause
> UAF when the slots in use are deleted concurrently.
> 
> This patch applies the mixer->reg_mutex in all appropriate code paths
> (i.e. the ioctl functions) that may access slots.

Reviewed-by: Jaroslav Kysela <perex at perex.cz>

			Thanks,
				Jaroslav

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