From cda8e22085fc1623f91bed76bb9c8b541fe019c0 Mon Sep 17 00:00:00 2001
From: Johan Hovold <johan@kernel.org>
Date: Mon, 13 Mar 2017 13:39:01 +0100
Subject: [PATCH] isdn/gigaset: fix NULL-deref at probe

commit 68c32f9c2a36d410aa242e661506e5b2c2764179 upstream.

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

Fixes: cf7776dc05b8 ("[PATCH] isdn4linux: Siemens Gigaset drivers -
direct USB connection")
Cc: Hansjoerg Lipp <hjlipp@web.de>

Signed-off-by: Johan Hovold <johan@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
---
Reading git-format-patch failed