mac80211: enable assoc check for mesh interfaces

commit 3633ebebab2bbe88124388b7620442315c968e8f upstream.

We already set a station to be associated when peering completes, both
in user space and in the kernel.  Thus we should always have an
associated sta before sending data frames to that station.

Failure to check assoc state can cause crashes in the lower-level driver
due to transmitting unicast data frames before driver sta structures
(e.g. ampdu state in ath9k) are initialized.  This occurred when
forwarding in the presence of fixed mesh paths: frames were transmitted
to stations with whom we hadn't yet completed peering.

Reported-by: Alexis Green <agreen@cococorp.com>
Tested-by: Jesse Jones <jjones@cococorp.com>
Signed-off-by: Bob Copeland <me@bobcopeland.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>

diff --git a/net/mac80211/tx.c b/net/mac80211/tx.c
index 65df2962f78f9349a35d845e4c9c114d0bbdad7a..91826b6f0bbf6f7b7ef08bb15d6395d833eee9e9 100644 (file)
--- a/net/mac80211/tx.c
+++ b/net/mac80211/tx.c
@@ -278,9 +278,6 @@ ieee80211_tx_h_check_assoc(struct ieee80211_tx_data *tx)
        if (tx->sdata->vif.type == NL80211_IFTYPE_WDS)
                return TX_CONTINUE;
 
-       if (tx->sdata->vif.type == NL80211_IFTYPE_MESH_POINT)
-               return TX_CONTINUE;
-
        if (tx->flags & IEEE80211_TX_PS_BUFFERED)
                return TX_CONTINUE;