linux-kernel - [PATCH 3.2 134/199] mac80211: Fix adding of mesh vendor IEs

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Date:   Fri, 10 Mar 2017 11:46:10 +0000
From:   Ben Hutchings <ben@...adent.org.uk>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:     akpm@...ux-foundation.org,
        "Johannes Berg" <johannes.berg@...el.com>,
        "Thorsten Horstmann" <thorsten@...utech.de>,
        "Sven Eckelmann" <sven@...fation.org>,
        "Simon Wunderlich" <sw@...onwunderlich.de>,
        "Mathias Kretschmer" <mathias.kretschmer@....fraunhofer.de>
Subject: [PATCH 3.2 134/199] mac80211: Fix adding of mesh vendor IEs

3.2.87-rc1 review patch.  If anyone has any objections, please let me know.

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

From: Thorsten Horstmann <thorsten@...utech.de>

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@...utech.de>
Signed-off-by: Mathias Kretschmer <mathias.kretschmer@....fraunhofer.de>
Signed-off-by: Simon Wunderlich <sw@...onwunderlich.de>
[sven@...fation.org: Add commit message]
Signed-off-by: Sven Eckelmann <sven@...fation.org>
Signed-off-by: Johannes Berg <johannes.berg@...el.com>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 net/mac80211/mesh.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/net/mac80211/mesh.c
+++ b/net/mac80211/mesh.c
@@ -280,7 +280,7 @@ mesh_add_vendor_ies(struct sk_buff *skb,
 	/* 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)