[PATCH 3.16 277/305] ALSA: timer: Fix leak in SNDRV_TIMER_IOCTL_PARAMS

From: Ben Hutchings
Date: Sat Aug 13 2016 - 13:53:15 EST


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

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

From: Kangjie Lu <kangjielu@xxxxxxxxx>

commit cec8f96e49d9be372fdb0c3836dcf31ec71e457e upstream.

The stack object âtreadâ has a total size of 32 bytes. Its field
âeventâ and âvalâ both contain 4 bytes padding. These 8 bytes
padding bytes are sent to user without being initialized.

Signed-off-by: Kangjie Lu <kjlu@xxxxxxxxxx>
Signed-off-by: Takashi Iwai <tiwai@xxxxxxx>
Signed-off-by: Ben Hutchings <ben@xxxxxxxxxxxxxxx>
---
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;