linux-kernel - [PATCH 3.13.y-ckt 012/121] [media] ttusb-dec: buffer overflow in ioctl

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Message-Id: <1417548000-1794-13-git-send-email-kamal@canonical.com>
Date:	Tue,  2 Dec 2014 11:18:11 -0800
From:	Kamal Mostafa <kamal@...onical.com>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	kernel-team@...ts.ubuntu.com
Cc:	Dan Carpenter <dan.carpenter@...cle.com>,
	Mauro Carvalho Chehab <mchehab@....samsung.com>,
	Kamal Mostafa <kamal@...onical.com>
Subject: [PATCH 3.13.y-ckt 012/121] [media] ttusb-dec: buffer overflow in ioctl

3.13.11-ckt12 -stable review patch.  If anyone has any objections, please let me know.

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

From: Dan Carpenter <dan.carpenter@...cle.com>

commit f2e323ec96077642d397bb1c355def536d489d16 upstream.

We need to add a limit check here so we don't overflow the buffer.

Signed-off-by: Dan Carpenter <dan.carpenter@...cle.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@....samsung.com>
Reference: CVE-2014-8884
Signed-off-by: Kamal Mostafa <kamal@...onical.com>
---
 drivers/media/usb/ttusb-dec/ttusbdecfe.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/media/usb/ttusb-dec/ttusbdecfe.c b/drivers/media/usb/ttusb-dec/ttusbdecfe.c
index 5c45c9d..9c29552 100644
--- a/drivers/media/usb/ttusb-dec/ttusbdecfe.c
+++ b/drivers/media/usb/ttusb-dec/ttusbdecfe.c
@@ -156,6 +156,9 @@ static int ttusbdecfe_dvbs_diseqc_send_master_cmd(struct dvb_frontend* fe, struc
 		   0x00, 0x00, 0x00, 0x00,
 		   0x00, 0x00 };
 
+	if (cmd->msg_len > sizeof(b) - 4)
+		return -EINVAL;
+
 	memcpy(&b[4], cmd->msg, cmd->msg_len);
 
 	state->config->send_command(fe, 0x72,
-- 
1.9.1

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