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39 lines
1.3 KiB
Diff
39 lines
1.3 KiB
Diff
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From 3567eb6af614dac436c4b16a8d426f9faed639b3 Mon Sep 17 00:00:00 2001
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From: Takashi Iwai <tiwai@suse.de>
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Date: Tue, 12 Jan 2016 15:36:27 +0100
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Subject: ALSA: seq: Fix race at timer setup and close
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ALSA sequencer code has an open race between the timer setup ioctl and
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the close of the client. This was triggered by syzkaller fuzzer, and
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a use-after-free was caught there as a result.
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This patch papers over it by adding a proper queue->timer_mutex lock
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around the timer-related calls in the relevant code path.
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Reported-by: Dmitry Vyukov <dvyukov@google.com>
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Tested-by: Dmitry Vyukov <dvyukov@google.com>
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Cc: <stable@vger.kernel.org>
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Signed-off-by: Takashi Iwai <tiwai@suse.de>
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---
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sound/core/seq/seq_queue.c | 2 ++
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1 file changed, 2 insertions(+)
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diff --git a/sound/core/seq/seq_queue.c b/sound/core/seq/seq_queue.c
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index 7dfd0f4..0bec02e 100644
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--- a/sound/core/seq/seq_queue.c
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+++ b/sound/core/seq/seq_queue.c
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@@ -142,8 +142,10 @@ static struct snd_seq_queue *queue_new(int owner, int locked)
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static void queue_delete(struct snd_seq_queue *q)
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{
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/* stop and release the timer */
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+ mutex_lock(&q->timer_mutex);
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snd_seq_timer_stop(q->timer);
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snd_seq_timer_close(q);
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+ mutex_unlock(&q->timer_mutex);
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/* wait until access free */
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snd_use_lock_sync(&q->use_lock);
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/* release resources... */
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--
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cgit v1.1
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