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Subject: [media] dib0700: fix NULL-deref at probe
Author: Johan Hovold <johan@xxxxxxxxxx>
Date: Mon Mar 13 09:53:54 2017 -0300
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@xxxxxxxxxxxxxxx> # 3.16
Cc: Mauro Carvalho Chehab <mchehab@xxxxxxxxxx>
Signed-off-by: Johan Hovold <johan@xxxxxxxxxx>
Signed-off-by: Hans Verkuil <hans.verkuil@xxxxxxxxx>
Signed-off-by: Mauro Carvalho Chehab <mchehab@xxxxxxxxxxxxxxxx>
drivers/media/usb/dvb-usb/dib0700_core.c | 3 +++
1 file changed, 3 insertions(+)
---
diff --git a/drivers/media/usb/dvb-usb/dib0700_core.c b/drivers/media/usb/dvb-usb/dib0700_core.c
index dd5edd3a17ee..08acdd32e412 100644
--- 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;