From: Arik Nemtsov <arik@wizery.com>
Date: Wed, 11 Jun 2014 14:18:26 +0000 (+0300)
Subject: mac80211: make sure TDLS peer STA exists during setup
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=7adc3e4664bc5bd382fa181e6a4506f5b5b583d8;p=GitHub%2Fexynos8895%2Fandroid_kernel_samsung_universal8895.git

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>
---

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,