[linux] 01/03: usbvision: fix overflow of interfaces array (CVE-2015-7833)

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commit 222755c823c1e7d86e3c77e06c080594828e7435
Author: Ben Hutchings <ben at decadent.org.uk>
Date:   Sun Nov 8 14:48:04 2015 +0000

    usbvision: fix overflow of interfaces array (CVE-2015-7833)
---
 debian/changelog                                   |  6 +++++
 ...sbvision-fix-overflow-of-interfaces-array.patch | 31 ++++++++++++++++++++++
 debian/patches/series                              |  1 +
 3 files changed, 38 insertions(+)

diff --git a/debian/changelog b/debian/changelog
index b2aaf98..28ef9f1 100644
--- a/debian/changelog
+++ b/debian/changelog
@@ -1,3 +1,9 @@
+linux (4.2.5-2) UNRELEASED; urgency=medium
+
+  * usbvision: fix overflow of interfaces array (CVE-2015-7833)
+
+ -- Ben Hutchings <ben at decadent.org.uk>  Sun, 08 Nov 2015 14:47:40 +0000
+
 linux (4.2.5-1) unstable; urgency=medium
 
   * New upstream stable update:
diff --git a/debian/patches/bugfix/all/usbvision-fix-overflow-of-interfaces-array.patch b/debian/patches/bugfix/all/usbvision-fix-overflow-of-interfaces-array.patch
new file mode 100644
index 0000000..839aa68
--- /dev/null
+++ b/debian/patches/bugfix/all/usbvision-fix-overflow-of-interfaces-array.patch
@@ -0,0 +1,31 @@
+From: Oliver Neukum <oneukum at suse.com>
+Date: Tue, 27 Oct 2015 12:42:38 +0100
+Subject: usbvision fix overflow of interfaces array
+Origin: https://bugzilla.novell.com/attachment.cgi?id=653350
+
+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 at suse.com>
+[bwh: Backported to 4.2: adjust context]
+---
+ drivers/media/usb/usbvision/usbvision-video.c | 7 +++++++
+ 1 file changed, 7 insertions(+)
+
+--- a/drivers/media/usb/usbvision/usbvision-video.c
++++ b/drivers/media/usb/usbvision/usbvision-video.c
+@@ -1533,6 +1533,13 @@ static int usbvision_probe(struct usb_in
+ 	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
diff --git a/debian/patches/series b/debian/patches/series
index 5792e69..0f2520e 100644
--- a/debian/patches/series
+++ b/debian/patches/series
@@ -104,3 +104,4 @@ bugfix/all/KEYS-Don-t-permit-request_key-to-construct-a-new-key.patch
 
 debian/target-fix-abi-change-in-4.2.4.patch
 debian/signal-fix-abi-change-in-4.2.4.patch
+bugfix/all/usbvision-fix-overflow-of-interfaces-array.patch

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