From da7061c82e4a1bc6a5e134ef362c86261906c860 Mon Sep 17 00:00:00 2001
From: Thorsten Horstmann <thorsten@defutech.de>
Date: Fri, 3 Feb 2017 14:38:29 +0100
Subject: [PATCH] mac80211: Fix adding of mesh vendor IEs

commit da7061c82e4a1bc6a5e134ef362c86261906c860 upstream.

The function ieee80211_ie_split_vendor doesn't return 0 on errors. Instead
it returns any offset < ielen when WLAN_EID_VENDOR_SPECIFIC is found. The
return value in mesh_add_vendor_ies must therefore be checked against
ifmsh->ie_len and not 0. Otherwise all ifmsh->ie starting with
WLAN_EID_VENDOR_SPECIFIC will be rejected.

Fixes: 082ebb0c258d ("mac80211: fix mesh beacon format")
Signed-off-by: Thorsten Horstmann <thorsten@defutech.de>
Signed-off-by: Mathias Kretschmer <mathias.kretschmer@fit.fraunhofer.de>
Signed-off-by: Simon Wunderlich <sw@simonwunderlich.de>
[sven@narfation.org: Add commit message]
Signed-off-by: Sven Eckelmann <sven@narfation.org>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

diff --git a/net/mac80211/mesh.c b/net/mac80211/mesh.c
index 42120d965263..50e1b7f78bd4 100644
--- a/net/mac80211/mesh.c
+++ b/net/mac80211/mesh.c
@@ -339,7 +339,7 @@ int mesh_add_vendor_ies(struct ieee80211_sub_if_data *sdata,
 	/* fast-forward to vendor IEs */
 	offset = ieee80211_ie_split_vendor(ifmsh->ie, ifmsh->ie_len, 0);
 
-	if (offset) {
+	if (offset < ifmsh->ie_len) {
 		len = ifmsh->ie_len - offset;
 		data = ifmsh->ie + offset;
 		if (skb_tailroom(skb) < len)
-- 
2.12.0