ALSA: seq: Fix race during FIFO resize

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commit 2d7d54002e upstream.

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>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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Takashi Iwai 2017-03-24 17:07:57 +01:00 • committed by Greg Kroah-Hartman

parent 0dd5b335ed

commit 74a2c1ff88

1 changed files with 4 additions and 0 deletions

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sound/core/seq/seq_fifo.c

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