[media] dib0700: fix NULL-deref at probe

Make sure to check the number of endpoints to avoid dereferencing a
NULL-pointer should a malicious device lack endpoints.

Fixes: c4018fa2e4c0 ("[media] dib0700: fix RC support on Hauppauge
Nova-TD")

Cc: stable <stable@vger.kernel.org>     # 3.16
Cc: Mauro Carvalho Chehab <mchehab@kernel.org>
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>

diff --git a/drivers/media/usb/dvb-usb/dib0700_core.c b/drivers/media/usb/dvb-usb/dib0700_core.c
index dd5edd3a17ee4deddd769da0325b9a99de161670..08acdd32e412945765a0760eaca32396bed47350 100644 (file)
--- a/drivers/media/usb/dvb-usb/dib0700_core.c
+++ b/drivers/media/usb/dvb-usb/dib0700_core.c
@@ -809,6 +809,9 @@ int dib0700_rc_setup(struct dvb_usb_device *d, struct usb_interface *intf)
 
        /* Starting in firmware 1.20, the RC info is provided on a bulk pipe */
 
+       if (intf->altsetting[0].desc.bNumEndpoints < rc_ep + 1)
+               return -ENODEV;
+
        purb = usb_alloc_urb(0, GFP_KERNEL);
        if (purb == NULL)
                return -ENOMEM;