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[media] dib0700: fix NULL-deref at probe

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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>
This commit is contained in:
Johan Hovold 2017-03-13 09:53:54 -03:00 committed by Mauro Carvalho Chehab
parent bff8ff6528
commit d5823511c0
1 changed files with 3 additions and 0 deletions
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3
drivers/media/usb/dvb-usb/dib0700_core.c
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@ -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;