linux-kernel - [PATCH 3.12 73/88] ALSA: timer: Fix leak in events via snd_timer_user

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Date:	Thu, 14 Jul 2016 10:16:05 +0200
From:	Jiri Slaby <jslaby@...e.cz>
To:	stable@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, Kangjie Lu <kangjielu@...il.com>,
	Kangjie Lu <kjlu@...ech.edu>, Takashi Iwai <tiwai@...e.de>,
	Jiri Slaby <jslaby@...e.cz>
Subject: [PATCH 3.12 73/88] ALSA: timer: Fix leak in events via snd_timer_user_ccallback

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

3.12-stable review patch.  If anyone has any objections, please let me know.

===============

commit 9a47e9cff994f37f7f0dbd9ae23740d0f64f9fe6 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: Jiri Slaby <jslaby@...e.cz>
---
 sound/core/timer.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/sound/core/timer.c b/sound/core/timer.c
index 7bf8186472fb..aa0582c5dd2e 100644
--- a/sound/core/timer.c
+++ b/sound/core/timer.c
@@ -1218,6 +1218,7 @@ static void snd_timer_user_ccallback(struct snd_timer_instance *timeri,
 		tu->tstamp = *tstamp;
 	if ((tu->filter & (1 << event)) == 0 || !tu->tread)
 		return;
+	memset(&r1, 0, sizeof(r1));
 	r1.event = event;
 	r1.tstamp = *tstamp;
 	r1.val = resolution;
-- 
2.9.1