isdn/gigaset: fix NULL-deref at probe
authorJohan Hovold <johan@kernel.org>
Mon, 13 Mar 2017 12:39:01 +0000 (13:39 +0100)
committerBen Hutchings <ben@decadent.org.uk>
Tue, 18 Jul 2017 17:38:31 +0000 (18:38 +0100)
commitcda8e22085fc1623f91bed76bb9c8b541fe019c0
treec68a2dc868e5697e866853d6c37e8e1aae4a96b7
parent73e78a1d53ea9f6e57ce7332c654626c236fe493
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>
drivers/isdn/gigaset/bas-gigaset.c