ALSA: opl3: fix infoleak in opl3

commit ad155712bb1ea2151944cf06a0e08c315c70c1e3 upstream.

The stack object “info” in snd_opl3_ioctl() has a leaking problem.
It has 2 padding bytes which are not initialized and leaked via
“copy_to_user”.

Signed-off-by: xidongwang <wangxidong_97@163.com>
Cc: <stable@vger.kernel.org>
Link: https://lore.kernel.org/r/1594006058-30362-1-git-send-email-wangxidong_97@163.com
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/sound/drivers/opl3/opl3_synth.c b/sound/drivers/opl3/opl3_synth.c
index 42920a2..3f94746 100644 (file)
--- a/sound/drivers/opl3/opl3_synth.c
+++ b/sound/drivers/opl3/opl3_synth.c
@@ -104,6 +104,8 @@ int snd_opl3_ioctl(struct snd_hwdep * hw, struct file *file,
                {
                        struct snd_dm_fm_info info;
 
+                       memset(&info, 0, sizeof(info));
+
                        info.fm_mode = opl3->fm_mode;
                        info.rhythm = opl3->rhythm;
                        if (copy_to_user(argp, &info, sizeof(struct snd_dm_fm_info)))