linux-kernel - [PATCH 0/2] ALSA: pcm: Fix race condition in runtime access

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Date:   Wed, 13 Nov 2019 01:17:13 +0800
From:   paulhsia <paulhsia@...omium.org>
To:     linux-kernel@...r.kernel.org
Cc:     Mark Brown <broonie@...nel.org>, Takashi Iwai <tiwai@...e.com>,
        alsa-devel@...a-project.org, paulhsia <paulhsia@...omium.org>
Subject: [PATCH 0/2] ALSA: pcm: Fix race condition in runtime access

Since
- snd_pcm_detach_substream sets runtime to null without stream lock and
- snd_pcm_period_elapsed checks the nullity of the runtime outside of
  stream lock.

This will trigger null memory access in snd_pcm_running() call in
snd_pcm_period_elapsed.

paulhsia (2):
  ALSA: pcm: Fix stream lock usage in snd_pcm_period_elapsed()
  ALSA: pcm: Use stream lock in snd_pcm_detach_substream()

 sound/core/pcm.c     | 8 +++++++-
 sound/core/pcm_lib.c | 8 ++++++--
 2 files changed, 13 insertions(+), 3 deletions(-)

-- 
2.24.0.rc1.363.gb1bccd3e3d-goog