Commit 1a1981ef authored by Thorsten Horstmann's avatar Thorsten Horstmann Committed by Greg Kroah-Hartman

mac80211: Fix adding of mesh vendor IEs

commit da7061c8 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: 082ebb0c ("mac80211: fix mesh beacon format")
Signed-off-by: default avatarThorsten Horstmann <thorsten@defutech.de>
Signed-off-by: default avatarMathias Kretschmer <mathias.kretschmer@fit.fraunhofer.de>
Signed-off-by: default avatarSimon Wunderlich <sw@simonwunderlich.de>
[sven@narfation.org: Add commit message]
Signed-off-by: default avatarSven Eckelmann <sven@narfation.org>
Signed-off-by: default avatarJohannes Berg <johannes.berg@intel.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent f9bd791b
......@@ -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)
......
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