ALSA: timer: Fix leak in events via snd_timer_user_tinterrupt

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@gatech.edu>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

1 files changed, 1 insertions, 0 deletions

diff --git a/sound/core/timer.c b/sound/core/timer.c
index cc3c08d17ab1..e722022d325d 100644
--- a/sound/core/timer.c
+++ b/sound/core/timer.c
@@ -1266,6 +1266,7 @@ static void snd_timer_user_tinterrupt(struct snd_timer_instance *timeri,
         }
         if ((tu->filter & (1 << SNDRV_TIMER_EVENT_RESOLUTION)) &&
             tu->last_resolution != resolution) {
+                memset(&r1, 0, sizeof(r1));
                 r1.event = SNDRV_TIMER_EVENT_RESOLUTION;
                 r1.tstamp = tstamp;
                 r1.val = resolution;