| From | Greg Kroah-Hartman <> | Subject | [PATCH 4.4 33/87] [media] usbvision fix overflow of interfaces array | Date | Mon, 15 Jan 2018 13:34:32 +0100 |
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4.4-stable review patch. If anyone has any objections, please let me know.
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From: Oliver Neukum <oneukum@suse.com>
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@suse.com> Cc: Vladis Dronov <vdronov@redhat.com> Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com> Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
--- 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)
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