From: Takashi Iwai <tiwai@suse.de>
Date: Thu, 30 Nov 2017 09:08:28 +0000 (+0100)
Subject: ALSA: seq: Remove spurious WARN_ON() at timer check
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=982892ad57c063a43a152f069191f8e4130e6110;p=pandora-kernel.git

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

commit 43a3542870328601be02fcc9d27b09db467336ef 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: Ben Hutchings <ben@decadent.org.uk>
---

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