From: Oliver Neukum Date: Tue, 27 Oct 2015 11:51:34 +0000 (-0200) Subject: usbvision fix overflow of interfaces array X-Git-Tag: v3.2.77~2 X-Git-Url: https://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;ds=sidebyside;h=ae64b688736b2aa3861ca02792b69041676329a2;hp=8069deca8771dcdfcf3e9e34a71c918b8ddc76d5;p=pandora-kernel.git 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 --- 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