mac80211: make sure TDLS peer STA exists during setup

Make sure userspace added a TDLS peer station before invoking the
transmission of the first setup frame. This ensures packets to the peer
won't go through the AP path.

Signed-off-by: Arik Nemtsov <arikx.nemtsov@intel.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

1 files changed, 13 insertions, 0 deletions

diff --git a/net/mac80211/tdls.c b/net/mac80211/tdls.c
index 6f3a3ad0cb7c..b87e369561f4 100644
--- a/net/mac80211/tdls.c
+++ b/net/mac80211/tdls.c
@@ -332,6 +332,19 @@ ieee80211_tdls_mgmt_setup(struct wiphy *wiphy, struct net_device *dev,
                 goto exit;
         }
 
+        /*
+         * make sure we have a STA representing the peer so we drop or buffer
+         * non-TDLS-setup frames to the peer. We can't send other packets
+         * during setup through the AP path
+         */
+        rcu_read_lock();
+        if (!sta_info_get(sdata, peer)) {
+                rcu_read_unlock();
+                ret = -ENOLINK;
+                goto exit;
+        }
+        rcu_read_unlock();
+
         ieee80211_flush_queues(local, sdata);
 
         ret = ieee80211_tdls_prep_mgmt_packet(wiphy, dev, peer, action_code,