linux-kernel - [PATCH 1/1] ALSA: opl3: fix infoleak in opl3

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Date:   Sun,  5 Jul 2020 20:27:38 -0700
From:   Xidong Wang <wangxidong_97@....com>
To:     Xidong Wang <wangxidong_97@....com>,
        Jaroslav Kysela <perex@...ex.cz>,
        Takashi Iwai <tiwai@...e.com>, alsa-devel@...a-project.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH 1/1] ALSA: opl3: fix infoleak in opl3

From: xidongwang <wangxidong_97@....com>

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@....com>
---
 sound/drivers/opl3/opl3_synth.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/sound/drivers/opl3/opl3_synth.c b/sound/drivers/opl3/opl3_synth.c
index e69a4ef..08c10ac 100644
--- a/sound/drivers/opl3/opl3_synth.c
+++ b/sound/drivers/opl3/opl3_synth.c
@@ -91,6 +91,8 @@ 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)))
-- 
2.7.4