From ae64b688736b2aa3861ca02792b69041676329a2 Mon Sep 17 00:00:00 2001 From: Oliver Neukum Date: Tue, 27 Oct 2015 09:51:34 -0200 Subject: usbvision fix overflow of interfaces array 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 Cc: Vladis Dronov Signed-off-by: Hans Verkuil Signed-off-by: Mauro Carvalho Chehab [bwh: Backported to 3.2: adjust filename] Signed-off-by: Ben Hutchings --- 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 42cf403f7963..20787d6ceeaf 100644 --- a/drivers/media/video/usbvision/usbvision-video.c +++ b/drivers/media/video/usbvision/usbvision-video.c @@ -1502,6 +1502,13 @@ static int __devinit 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 -- cgit v1.2.3