From: Johannes Berg <johannes@sipsolutions.net>
Date: Fri, 20 Nov 2009 09:09:14 +0000 (+0100)
Subject: mac80211: fix rcu locking
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=3305443c968b98902199bea0abbd9443c6a2bb8d;p=GitHub%2Fmoto-9609%2Fandroid_kernel_motorola_exynos9610.git

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>
---

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);
 		}