mac80211: fix rcu locking

Add a missing rcu_read_unlock() before jumping out
of the ieee80211_change_station() function in the
error case.

Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 3 insertions, 1 deletions

diff --git a/net/mac80211/cfg.c b/net/mac80211/cfg.c
index c484a882140e..93ee1fd5c08d 100644
--- a/net/mac80211/cfg.c
+++ b/net/mac80211/cfg.c
@@ -823,8 +823,10 @@ static int ieee80211_change_station(struct wiphy *wiphy,
                 }
 
                 if (params->vlan->ieee80211_ptr->use_4addr) {
-                        if (vlansdata->u.vlan.sta)
+                        if (vlansdata->u.vlan.sta) {
+                                rcu_read_unlock();
                                 return -EBUSY;
+                        }
 
                         rcu_assign_pointer(vlansdata->u.vlan.sta, sta);
                 }