cfg80211: fix locking in action frame TX

Accesses to "wdev->current_bss" must be
locked with the wdev lock, which action
frame transmission is missing.

Cc: stable@kernel.org [2.6.33+]
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/net/wireless/mlme.c b/net/wireless/mlme.c
index e74a1a2..d1a3fb9 100644
--- a/net/wireless/mlme.c
+++ b/net/wireless/mlme.c
@@ -843,13 +843,19 @@
 		return -EINVAL;
 	if (mgmt->u.action.category != WLAN_CATEGORY_PUBLIC) {
 		/* Verify that we are associated with the destination AP */
+		wdev_lock(wdev);
+
 		if (!wdev->current_bss ||
 		    memcmp(wdev->current_bss->pub.bssid, mgmt->bssid,
 			   ETH_ALEN) != 0 ||
 		    (wdev->iftype == NL80211_IFTYPE_STATION &&
 		     memcmp(wdev->current_bss->pub.bssid, mgmt->da,
-			    ETH_ALEN) != 0))
+			    ETH_ALEN) != 0)) {
+			wdev_unlock(wdev);
 			return -ENOTCONN;
+		}
+
+		wdev_unlock(wdev);
 	}
 
 	if (memcmp(mgmt->sa, dev->dev_addr, ETH_ALEN) != 0)