linux-kernel - [PATCH 4.9 16/86] ALSA: opl3: fix infoleak in opl3

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Message-Id: <20200720152753.958045712@linuxfoundation.org>
Date:   Mon, 20 Jul 2020 17:36:12 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, xidongwang <wangxidong_97@....com>,
        Takashi Iwai <tiwai@...e.de>
Subject: [PATCH 4.9 16/86] ALSA: opl3: fix infoleak in opl3

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

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

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

--- 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 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)))