linux-kernel - [PATCH 3.16.y-ckt 001/129] [media] usbvision fix overflow of interfaces array

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Date:	Fri, 26 Feb 2016 10:19:32 +0000
From:	Luis Henriques <luis.henriques@...onical.com>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	kernel-team@...ts.ubuntu.com
Cc:	Oliver Neukum <oneukum@...e.com>,
	Vladis Dronov <vdronov@...hat.com>,
	Hans Verkuil <hans.verkuil@...co.com>,
	Mauro Carvalho Chehab <mchehab@....samsung.com>,
	Moritz Muehlenhoff <jmm@...til.org>,
	Luis Henriques <luis.henriques@...onical.com>
Subject: [PATCH 3.16.y-ckt 001/129] [media] usbvision fix overflow of interfaces array

3.16.7-ckt25 -stable review patch.  If anyone has any objections, please let me know.

---8<------------------------------------------------------------

From: Oliver Neukum <oneukum@...e.com>

commit 588afcc1c0e45358159090d95bf7b246fb67565f upstream.

This fixes the crash reported in:
http://seclists.org/bugtraq/2015/Oct/35
The interface number needs a sanity check.

Signed-off-by: Oliver Neukum <oneukum@...e.com>
Cc: Vladis Dronov <vdronov@...hat.com>
Signed-off-by: Hans Verkuil <hans.verkuil@...co.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@....samsung.com>
Cc: Moritz Muehlenhoff <jmm@...til.org>
Signed-off-by: Luis Henriques <luis.henriques@...onical.com>
---
 drivers/media/usb/usbvision/usbvision-video.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/drivers/media/usb/usbvision/usbvision-video.c b/drivers/media/usb/usbvision/usbvision-video.c
index 68bc9615660e..01d0dd99bb24 100644
--- a/drivers/media/usb/usbvision/usbvision-video.c
+++ b/drivers/media/usb/usbvision/usbvision-video.c
@@ -1536,6 +1536,13 @@ static int usbvision_probe(struct usb_interface *intf,
 	printk(KERN_INFO "%s: %s found\n", __func__,
 				usbvision_device_data[model].model_string);
 
+	/*
+	 * this is a security check.
+	 * an exploit using an incorrect bInterfaceNumber is known
+	 */
+	if (ifnum >= USB_MAXINTERFACES || !dev->actconfig->interface[ifnum])
+		return -ENODEV;
+
 	if (usbvision_device_data[model].interface >= 0)
 		interface = &dev->actconfig->interface[usbvision_device_data[model].interface]->altsetting[0];
 	else