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[media] usbvision: fix NULL-deref at probe 

Make sure to check the number of endpoints to avoid dereferencing a
NULL-pointer or accessing memory beyond the endpoint array should a
malicious device lack the expected endpoints.

Fixes: 2a9f8b5d25 ("V4L/DVB (5206): Usbvision: set alternate interface
modification")

Cc: stable <stable@vger.kernel.org>     # 2.6.21
Cc: Thierry MERLE <thierry.merle@free.fr>
Signed-off-by: Johan Hovold <johan@kernel.org>
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
This commit is contained in:
Johan Hovold 2017-03-13 09:53:55 -03:00 committed by Mauro Carvalho Chehab
parent d5823511c0
commit eacb975b48
1 changed files with 8 additions and 1 deletions
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9
drivers/media/usb/usbvision/usbvision-video.c
View File

@ -1501,7 +1501,14 @@ static int usbvision_probe(struct usb_interface *intf,
}
for (i = 0; i < usbvision->num_alt; i++) {
u16 tmp = le16_to_cpu(uif->altsetting[i].endpoint[1].desc.
u16 tmp;
if (uif->altsetting[i].desc.bNumEndpoints < 2) {
ret = -ENODEV;
goto err_pkt;
}
tmp = le16_to_cpu(uif->altsetting[i].endpoint[1].desc.
wMaxPacketSize);
usbvision->alt_max_pkt_size[i] =
(tmp & 0x07ff) * (((tmp & 0x1800) >> 11) + 1);