From: Oliver Neukum <oneukum@xxxxxxxx> This patch has been added to the 4.1 stable tree. If you have any objections, please let us know. =============== [ Upstream commit 588afcc1c0e45358159090d95bf7b246fb67565f ] 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> Signed-off-by: Sasha Levin <alexander.levin@xxxxxxxxxxxxx> --- 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 3b3becc5718d..7b12710becac 100644 --- a/drivers/media/usb/usbvision/usbvision-video.c +++ b/drivers/media/usb/usbvision/usbvision-video.c @@ -1522,6 +1522,13 @@ 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 if (ifnum < dev->actconfig->desc.bNumInterfaces) -- 2.14.1