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[3.13.y-ckt,072/138] ALSA: timer: Fix race between stop and interrupt

Message ID 1457565265-15195-73-git-send-email-kamal@canonical.com
State New
Headers show

Commit Message

Kamal Mostafa March 9, 2016, 11:13 p.m. UTC 
3.13.11-ckt36 -stable review patch.  If anyone has any objections, please let me know.

---8<------------------------------------------------------------

From: Takashi Iwai <tiwai@suse.de>

commit ed8b1d6d2c741ab26d60d499d7fbb7ac801f0f51 upstream.

A slave timer element also unlinks at snd_timer_stop() but it takes
only slave_active_lock.  When a slave is assigned to a master,
however, this may become a race against the master's interrupt
handling, eventually resulting in a list corruption.  The actual bug
could be seen with a syzkaller fuzzer test case in BugLink below.

As a fix, we need to take timeri->timer->lock when timer isn't NULL,
i.e. assigned to a master, while the assignment to a master itself is
protected by slave_active_lock.

BugLink: http://lkml.kernel.org/r/CACT4Y+Y_Bm+7epAb=8Wi=AaWd+DYS7qawX52qxdCfOfY49vozQ@mail.gmail.com
Signed-off-by: Takashi Iwai <tiwai@suse.de>
[ kamal: backport to 3.13-stable: context ]
Signed-off-by: Kamal Mostafa <kamal@canonical.com>
---
 sound/core/timer.c | 4 ++++
 1 file changed, 4 insertions(+)
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Patch

diff --git a/sound/core/timer.c b/sound/core/timer.c
index 44cbdde..cbb127b 100644
--- a/sound/core/timer.c
+++ b/sound/core/timer.c
@@ -511,9 +511,13 @@  static int _snd_timer_stop(struct snd_timer_instance * timeri,
 				spin_unlock_irqrestore(&slave_active_lock, flags);
 				return -EBUSY;
 			}
+			if (timeri->timer)
+				spin_lock(&timeri->timer->lock);
 			timeri->flags &= ~SNDRV_TIMER_IFLG_RUNNING;
 			list_del_init(&timeri->ack_list);
 			list_del_init(&timeri->active_list);
+			if (timeri->timer)
+				spin_unlock(&timeri->timer->lock);
 			spin_unlock_irqrestore(&slave_active_lock, flags);
 		}
 		goto __end;