3.16.7-ckt25 -stable review patch. If anyone has any objections, please let me know.
---8<------------------------------------------------------------ From: Oliver Neukum <[email protected]> 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 <[email protected]> Cc: Vladis Dronov <[email protected]> Signed-off-by: Hans Verkuil <[email protected]> Signed-off-by: Mauro Carvalho Chehab <[email protected]> Cc: Moritz Muehlenhoff <[email protected]> Signed-off-by: Luis Henriques <[email protected]> --- 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
