This is a note to let you know that I've just added the patch titled
[media] usbvision fix overflow of interfaces array
to the 4.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
usbvision-fix-overflow-of-interfaces-array.patch
and it can be found in the queue-4.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 588afcc1c0e45358159090d95bf7b246fb67565f Mon Sep 17 00:00:00 2001
From: Oliver Neukum <oneukum@xxxxxxxx>
Date: Tue, 27 Oct 2015 09:51:34 -0200
Subject: [media] usbvision fix overflow of interfaces array
From: Oliver Neukum <oneukum@xxxxxxxx>
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@xxxxxxxx>
Cc: Vladis Dronov <vdronov@xxxxxxxxxx>
Signed-off-by: Hans Verkuil <hans.verkuil@xxxxxxxxx>
Signed-off-by: Mauro Carvalho Chehab <mchehab@xxxxxxxxxxxxxxx>
Cc: Moritz Muehlenhoff <moritz@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
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
@@ -1461,6 +1461,13 @@ 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 if (ifnum < dev->actconfig->desc.bNumInterfaces)
Patches currently in stable-queue which might be from oneukum@xxxxxxxx are
queue-4.4/usbvision-fix-overflow-of-interfaces-array.patch
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