linux-kernel - [PATCH 145/173] sound: oss: midi_synth: check get

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Date:	Mon, 25 Apr 2011 22:04:57 +0200
From:	Willy Tarreau <w@....eu>
To:	linux-kernel@...r.kernel.org, stable@...nel.org,
	stable-review@...nel.org
Cc:	Kulikov Vasiliy <segooon@...il.com>, Takashi Iwai <tiwai@...e.de>,
	Greg Kroah-Hartman <gregkh@...e.de>
Subject: [PATCH 145/173] sound: oss: midi_synth: check get_user() return value

2.6.27.59-stable review patch.  If anyone has any objections, please let us know.

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

From: Kulikov Vasiliy <segooon@...il.com>

commit b3390ceab95601afc12213c3ec5551d3bc7b638f upstream.

get_user() may fail, if so return -EFAULT.

Signed-off-by: Kulikov Vasiliy <segooon@...il.com>
Signed-off-by: Takashi Iwai <tiwai@...e.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>

---
 sound/oss/midi_synth.c |    4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

--- a/sound/oss/midi_synth.c
+++ b/sound/oss/midi_synth.c
@@ -519,7 +519,9 @@ midi_synth_load_patch(int dev, int forma
 	{
 		unsigned char   data;
 
-		get_user(*(unsigned char *) &data, (unsigned char __user *) &((addr)[hdr_size + i]));
+		if (get_user(data,
+		    (unsigned char __user *)(addr + hdr_size + i)))
+			return -EFAULT;
 
 		eox_seen = (i > 0 && data & 0x80);	/* End of sysex */
 


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