linux-kernel - [PATCH 3.4 108/177] ALSA: pcm: Zero-clear reserved fields of PCM status ioctl in compat mode

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Message-Id: <1422418236-12852-199-git-send-email-lizf@kernel.org>
Date:	Wed, 28 Jan 2015 12:09:26 +0800
From:	lizf@...nel.org
To:	stable@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, Takashi Iwai <tiwai@...e.de>,
	Zefan Li <lizefan@...wei.com>
Subject: [PATCH 3.4 108/177] ALSA: pcm: Zero-clear reserved fields of PCM status ioctl in compat mode

From: Takashi Iwai <tiwai@...e.de>

3.4.106-rc1 review patch.  If anyone has any objections, please let me know.

------------------


commit 317168d0c766defd14b3d0e9c2c4a9a258b803ee upstream.

In compat mode, we copy each field of snd_pcm_status struct but don't
touch the reserved fields, and this leaves uninitialized values
there.  Meanwhile the native ioctl does zero-clear the whole
structure, so we should follow the same rule in compat mode, too.

Reported-by: Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>
Signed-off-by: Takashi Iwai <tiwai@...e.de>
Signed-off-by: Zefan Li <lizefan@...wei.com>
---
 sound/core/pcm_compat.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/sound/core/pcm_compat.c b/sound/core/pcm_compat.c
index 91cdf94..4dbb66e 100644
--- a/sound/core/pcm_compat.c
+++ b/sound/core/pcm_compat.c
@@ -204,6 +204,8 @@ static int snd_pcm_status_user_compat(struct snd_pcm_substream *substream,
 	if (err < 0)
 		return err;
 
+	if (clear_user(src, sizeof(*src)))
+		return -EFAULT;
 	if (put_user(status.state, &src->state) ||
 	    put_user(status.trigger_tstamp.tv_sec, &src->trigger_tstamp.tv_sec) ||
 	    put_user(status.trigger_tstamp.tv_nsec, &src->trigger_tstamp.tv_nsec) ||
-- 
1.9.1

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