commit b341c1681eca7fb280096b426bff9e37b979419b
author Kangjie Lu <kangjielu@gmail.com> Tue May 03 16:44:32 2016 -0400
committer Michał Orynicz <michal.orynicz@sonymobile.com> Thu Jul 21 14:26:36 2016 +0200
tree 4ec9674ada0cbac2bc925c347f1a33ee62acc526
parent 72b5e8afee774d52b4da465da6856d7519dee217

ALSA: timer: Fix leak in events via snd_timer_user_tinterrupt

The stack object “r1” has a total size of 32 bytes. Its field
“event” and “val” both contain 4 bytes padding. These 8 bytes
padding bytes are sent to user without being initialized.

Signed-off-by: Kangjie Lu <kjlu@gatech.edu>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
(cherry picked from commit e4ec8cc8039a7063e24204299b462bd1383184a5)

Issue: KIONE-3528

Change-Id: I87461ee61c53faadffdce885c409efad723ce54d

sound/core/timer.c

diff --git a/sound/core/timer.c b/sound/core/timer.c
index 7e2bfb0..e687858 100644
--- a/sound/core/timer.c
+++ b/sound/core/timer.c
@@ -1218,6 +1218,7 @@
 	}
 	if ((tu->filter & (1 << SNDRV_TIMER_EVENT_RESOLUTION)) &&
 	    tu->last_resolution != resolution) {
+		memset(&r1, 0, sizeof(r1));
 		r1.event = SNDRV_TIMER_EVENT_RESOLUTION;
 		r1.tstamp = tstamp;
 		r1.val = resolution;