[PATCH 2/6] [media] usbvision: fix NULL-deref at probe

[Johan Hovold]

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: 2a9f8b5d25be ("V4L/DVB (5206): Usbvision: set alternate interface
modification")
Cc: stable <sta...@vger.kernel.org>     # 2.6.21
Cc: Thierry MERLE <thierry.me...@free.fr>
Signed-off-by: Johan Hovold <jo...@kernel.org>
---
 drivers/media/usb/usbvision/usbvision-video.c | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/drivers/media/usb/usbvision/usbvision-video.c 
b/drivers/media/usb/usbvision/usbvision-video.c
index f5c635a67d74..f9c3325aa4d4 100644
--- a/drivers/media/usb/usbvision/usbvision-video.c
+++ b/drivers/media/usb/usbvision/usbvision-video.c
@@ -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);
-- 
2.12.0