linux-kernel - [PATCH 3.10 132/180] ALSA: timer: Fix leak in SNDRV_TIMER_IOCTL

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Message-Id: <1471793510-13022-133-git-send-email-w@1wt.eu>
Date:   Sun, 21 Aug 2016 17:31:02 +0200
From:   Willy Tarreau <w@....eu>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Kangjie Lu <kangjielu@...il.com>, Kangjie Lu <kjlu@...ech.edu>,
        Takashi Iwai <tiwai@...e.de>, Willy Tarreau <w@....eu>
Subject: [PATCH 3.10 132/180] ALSA: timer: Fix leak in SNDRV_TIMER_IOCTL_PARAMS

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: Willy Tarreau <w@....eu>
---
 sound/core/timer.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/sound/core/timer.c b/sound/core/timer.c
index 38742e8..54ff806 100644
--- a/sound/core/timer.c
+++ b/sound/core/timer.c
@@ -1707,6 +1707,7 @@ static int snd_timer_user_params(struct file *file,
 	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;
-- 
2.8.0.rc2.1.gbe9624a