Commit c7bcf82e authored by Johan Hovold's avatar Johan Hovold Committed by Sasha Levin

[media] dib0700: fix NULL-deref at probe

[ Upstream commit d5823511 ]

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

Fixes: c4018fa2 ("[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: default avatarJohan Hovold <johan@kernel.org>
Signed-off-by: default avatarHans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: default avatarMauro Carvalho Chehab <mchehab@s-opensource.com>
Signed-off-by: default avatarSasha Levin <alexander.levin@verizon.com>
parent 27a0c231
...@@ -782,6 +782,9 @@ int dib0700_rc_setup(struct dvb_usb_device *d, struct usb_interface *intf) ...@@ -782,6 +782,9 @@ 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 */ /* 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); purb = usb_alloc_urb(0, GFP_KERNEL);
if (purb == NULL) { if (purb == NULL) {
err("rc usb alloc urb failed"); err("rc usb alloc urb failed");
......
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