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

paulhsia
2019-11-12T17:17:24Z

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(-)

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2.24.0.rc1.363.gb1bccd3e3d-goog