[PATCH 0/4] ALSA: pcm: Fix ioctl races
Jaroslav Kysela
perex at perex.cz
Tue Mar 22 18:14:35 CET 2022
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 at perex.cz>
--
Jaroslav Kysela <perex at perex.cz>
Linux Sound Maintainer; ALSA Project; Red Hat, Inc.
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