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ALSA: seq: Remove spurious WARN_ON() at timer check

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commit 43a3542870 upstream.

The use of snd_BUG_ON() in ALSA sequencer timer may lead to a spurious
WARN_ON() when a slave timer is deployed as its backend and a
corresponding master timer stops meanwhile.  The symptom was triggered
by syzkaller spontaneously.

Since the NULL timer is valid there, rip off snd_BUG_ON().

Reported-by: syzbot <syzkaller@googlegroups.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Takashi Iwai
2017-11-30 10:08:28 +01:00
committed by Greg Kroah-Hartman
parent 0482dcd510
commit 8a4b29a72a
1 changed files with 1 additions and 1 deletions
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2
sound/core/seq/seq_timer.c
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@@ -355,7 +355,7 @@ static int initialize_timer(struct snd_seq_timer *tmr)
unsigned long freq;
t = tmr->timeri->timer;
if (snd_BUG_ON(!t))
if (!t)
return -EINVAL;
freq = tmr->preferred_resolution;