[PATCH 4.9 083/164] [media] mceusb: fix NULL-deref at probe

[Greg Kroah-Hartman]

4.9-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Johan Hovold <jo...@kernel.org>

commit 03eb2a557ed552e920a0942b774aaf931596eec1 upstream.

Make sure to check for the required out endpoint to avoid dereferencing
a NULL-pointer in mce_request_packet should a malicious device lack such
an endpoint. Note that this path is hit during probe.

Fixes: 66e89522aff7 ("V4L/DVB: IR: add mceusb IR receiver driver")

Signed-off-by: Johan Hovold <jo...@kernel.org>
Signed-off-by: Sean Young <s...@mess.org>
Signed-off-by: Mauro Carvalho Chehab <mche...@s-opensource.com>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>

---
 drivers/media/rc/mceusb.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/drivers/media/rc/mceusb.c
+++ b/drivers/media/rc/mceusb.c
@@ -1332,8 +1332,8 @@ static int mceusb_dev_probe(struct usb_i
                        }
                }
        }
-       if (ep_in == NULL) {
-               dev_dbg(&intf->dev, "inbound and/or endpoint not found");
+       if (!ep_in || !ep_out) {
+               dev_dbg(&intf->dev, "required endpoints not found\n");
                return -ENODEV;
        }