ALSA: timer: Fix leak in events via snd_timer_user_ccallback

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 306a93dea20a..cc3c08d17ab1 100644
--- a/sound/core/timer.c
+++ b/sound/core/timer.c
@@ -1223,6 +1223,7 @@ 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;