linux-kernel - [PATCH] infoleak fix2 in timer

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Message-Id: <1462308260-6219-1-git-send-email-kjlu@gatech.edu>
Date:	Tue,  3 May 2016 16:44:20 -0400
From:	Kangjie Lu <kangjielu@...il.com>
To:	perex@...ex.cz
Cc:	tiwai@...e.com, linux-kernel@...r.kernel.org,
	alsa-devel@...a-project.org, taesoo@...ech.edu, insu@...ech.edu,
	Kangjie Lu <kjlu@...ech.edu>
Subject: [PATCH] infoleak fix2 in timer

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>
---
 sound/core/timer.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/sound/core/timer.c b/sound/core/timer.c
index 964f5eb..e98fa5f 100644
--- a/sound/core/timer.c
+++ b/sound/core/timer.c
@@ -1225,6 +1225,7 @@ 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;
-- 
1.9.1