ALSA: seq: Fix race during FIFO resize

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When a new event is queued while processing to resize the FIFO in
snd_seq_fifo_clear(), it may lead to a use-after-free, as the old pool
that is being queued gets removed.  For avoiding this race, we need to
close the pool to be deleted and sync its usage before actually
deleting it.

The issue was spotted by syzkaller.

Reported-by: Dmitry Vyukov <dvyukov@google.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

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Takashi Iwai 2017-03-24 17:07:57 +01:00

parent 3f307834e6

commit 2d7d54002e

1 changed files with 4 additions and 0 deletions

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sound/core/seq/seq_fifo.c

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