linux-kernel - [PATCH 2.6.32 38/62] s5h1420: fix a buffer overflow when checking userspace params

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Message-Id: <20150912225608.207439680@1wt.eu>
Date:	Sun, 13 Sep 2015 00:56:44 +0200
From:	Willy Tarreau <w@....eu>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:	Mauro Carvalho Chehab <mchehab@....samsung.com>,
	Ben Hutchings <ben@...adent.org.uk>, Willy Tarreau <w@....eu>
Subject: [PATCH 2.6.32 38/62] s5h1420: fix a buffer overflow when checking userspace
 params

2.6.32-longterm review patch.  If anyone has any objections, please let me know.

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

From: Mauro Carvalho Chehab <mchehab@....samsung.com>

commit 12f4543f5d6811f864e6c4952eb27253c7466c02 upstream.

The maximum size for a DiSEqC command is 6, according to the
userspace API. However, the code allows to write up to 7 values:
	drivers/media/dvb-frontends/s5h1420.c:193 s5h1420_send_master_cmd() error: buffer overflow 'cmd->msg' 6 <= 7

Signed-off-by: Mauro Carvalho Chehab <mchehab@....samsung.com>
[bwh: Backported to 3.2: adjust filename]
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
(cherry picked from commit 4bf124b5f179a9c169c57ef7cd3a74f239063ed1)

Signed-off-by: Willy Tarreau <w@....eu>
---
 drivers/media/dvb/frontends/s5h1420.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/media/dvb/frontends/s5h1420.c b/drivers/media/dvb/frontends/s5h1420.c
index 2e9fd28..6134578 100644
--- a/drivers/media/dvb/frontends/s5h1420.c
+++ b/drivers/media/dvb/frontends/s5h1420.c
@@ -180,7 +180,7 @@ static int s5h1420_send_master_cmd (struct dvb_frontend* fe,
 	int result = 0;
 
 	dprintk("enter %s\n", __func__);
-	if (cmd->msg_len > 8)
+	if (cmd->msg_len > sizeof(cmd->msg))
 		return -EINVAL;
 
 	/* setup for DISEQC */
-- 
1.7.12.2.21.g234cd45.dirty



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