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UPSTREAM: ALSA: timer: Fix wrong instance passed to slave callbacks

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commit 117159f0b9d392fb433a7871426fad50317f06f7 upstream.

In snd_timer_notify1(), the wrong timer instance was passed for slave
ccallback function.  This leads to the access to the wrong data when
an incompatible master is handled (e.g. the master is the sequencer
timer and the slave is a user timer), as spotted by syzkaller fuzzer.

This patch fixes that wrong assignment.

Bug: 37240993
Change-Id: I7a9f258f13d500776725f2383136dabcb563a0d3
BugLink: http://lkml.kernel.org/r/CACT4Y+Y_Bm+7epAb=8Wi=AaWd+DYS7qawX52qxdCfOfY49vozQ@mail.gmail.com
Reported-by: Dmitry Vyukov <dvyukov@google.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Siqi Lin <siqilin@google.com>
This commit is contained in:
Takashi Iwai 2016-02-08 17:36:25 +01:00 committed by Artem Borisov
parent 461effea6e
commit 0a5ec0eb11
1 changed files with 1 additions and 1 deletions
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2
sound/core/timer.c
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@ -415,7 +415,7 @@ static void snd_timer_notify1(struct snd_timer_instance *ti, int event)
spin_lock_irqsave(&timer->lock, flags);
list_for_each_entry(ts, &ti->slave_active_head, active_list)
if (ts->ccallback)
ts->ccallback(ti, event + 100, &tstamp, resolution);
ts->ccallback(ts, event + 100, &tstamp, resolution);
spin_unlock_irqrestore(&timer->lock, flags);
}