linux-kernel - [PATCH 3.16 277/305] ALSA: timer: Fix leak in SNDRV_TIMER_IOCTL

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Date:	Sat, 13 Aug 2016 18:42:51 +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" <kjlu@...ech.edu>,
	"Takashi Iwai" <tiwai@...e.de>, "Kangjie Lu" <kangjielu@...il.com>
Subject: [PATCH 3.16 277/305] ALSA: timer: Fix leak in SNDRV_TIMER_IOCTL_PARAMS

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

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

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

commit cec8f96e49d9be372fdb0c3836dcf31ec71e457e upstream.

The stack object “tread” 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
@@ -1750,6 +1750,7 @@ static int snd_timer_user_params(struct
 	if (tu->timeri->flags & SNDRV_TIMER_IFLG_EARLY_EVENT) {
 		if (tu->tread) {
 			struct snd_timer_tread tread;
+			memset(&tread, 0, sizeof(tread));
 			tread.event = SNDRV_TIMER_EVENT_EARLY;
 			tread.tstamp.tv_sec = 0;
 			tread.tstamp.tv_nsec = 0;