ALSA: seq: Fix race at timer setup and close

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commit 3567eb6af6 upstream.

ALSA sequencer code has an open race between the timer setup ioctl and
the close of the client.  This was triggered by syzkaller fuzzer, and
a use-after-free was caught there as a result.

This patch papers over it by adding a proper queue->timer_mutex lock
around the timer-related calls in the relevant code path.

Reported-by: Dmitry Vyukov <dvyukov@google.com>
Tested-by: Dmitry Vyukov <dvyukov@google.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

...

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Takashi Iwai 2016-01-12 15:36:27 +01:00 • committed by Greg Kroah-Hartman

parent 4aa59e944f

commit 0058ede73e

1 changed files with 2 additions and 0 deletions

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sound/core/seq/seq_queue.c

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