linux-kernel - [PATCH 2.6.32 02/55] usbvision fix overflow of interfaces array

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Message-Id: <20160304153000.798108133@1wt.eu>
Date:	Fri, 04 Mar 2016 16:30:02 +0100
From:	Willy Tarreau <w@....eu>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:	Oliver Neukum <oneukum@...e.com>,
	Vladis Dronov <vdronov@...hat.com>,
	Hans Verkuil <hans.verkuil@...co.com>,
	Mauro Carvalho Chehab <mchehab@....samsung.com>,
	Ben Hutchings <ben@...adent.org.uk>, Willy Tarreau <w@....eu>
Subject: [PATCH 2.6.32 02/55] usbvision fix overflow of interfaces array

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

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

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>
[bwh: Backported to 2.6.32: adjust filename, context]
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
Signed-off-by: Willy Tarreau <w@....eu>
---
 drivers/media/video/usbvision/usbvision-video.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/drivers/media/video/usbvision/usbvision-video.c b/drivers/media/video/usbvision/usbvision-video.c
index a2a50d6..1ebe22b1 100644
--- a/drivers/media/video/usbvision/usbvision-video.c
+++ b/drivers/media/video/usbvision/usbvision-video.c
@@ -1651,6 +1651,13 @@ static int __devinit usbvision_probe(struct usb_interface *intf,
 	printk(KERN_INFO "%s: %s found\n", __func__,
 				usbvision_device_data[model].ModelString);
 
+	/*
+	 * 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 {
-- 
1.7.12.2.21.g234cd45.dirty