linux-kernel - [PATCH 3.2 90/94] ALSA: timer: Fix leak in events via snd_timer_user

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Message-ID: <lsq.1471110178.567062681@decadent.org.uk>
Date:	Sat, 13 Aug 2016 18:42:58 +0100
From:	Ben Hutchings <ben@...adent.org.uk>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:	akpm@...ux-foundation.org, "Kangjie Lu" <kangjielu@...il.com>,
	"Takashi Iwai" <tiwai@...e.de>, "Kangjie Lu" <kjlu@...ech.edu>
Subject: [PATCH 3.2 90/94] ALSA: timer: Fix leak in events via
 snd_timer_user_tinterrupt

3.2.82-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Kangjie Lu <kangjielu@...il.com>

commit e4ec8cc8039a7063e24204299b462bd1383184a5 upstream.

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@...ech.edu>
Signed-off-by: Takashi Iwai <tiwai@...e.de>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 sound/core/timer.c | 1 +
 1 file changed, 1 insertion(+)

--- a/sound/core/timer.c
+++ b/sound/core/timer.c
@@ -1248,6 +1248,7 @@ static void snd_timer_user_tinterrupt(st
 	}
 	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;