cfg80211: avoid mem leak on driver hint set

commit 34f05f54 upstream.

In the already-set and intersect case of a driver-hint, the previous
wiphy regdomain was not freed before being reset with a copy of the
cfg80211 regdomain.
Signed-off-by: Arik Nemtsov <arikx.nemtsov@intel.com>
Acked-by: Luis R. Rodriguez <mcgrof@suse.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
[ kamal: backport to 3.13-stable: context ]
Signed-off-by: Kamal Mostafa <kamal@canonical.com>

net/wireless/reg.c

@@ -1455,7 +1455,7 @@ static enum reg_request_treatment
 __regulatory_hint(struct wiphy *wiphy,
 		  struct regulatory_request *pending_request)
 {
-	const struct ieee80211_regdomain *regd;
+	const struct ieee80211_regdomain *regd, *tmp;
 	bool intersect = false;
 	enum reg_request_treatment treatment;
 	struct regulatory_request *lr;
@@ -1491,7 +1491,9 @@ __regulatory_hint(struct wiphy *wiphy,
 				return REG_REQ_IGNORE;
 			}
 			treatment = REG_REQ_ALREADY_SET;
+			tmp = get_wiphy_regdom(wiphy);
 			rcu_assign_pointer(wiphy->regd, regd);
+			rcu_free_regdom(tmp);
 			goto new_request;
 		}
 		kfree(pending_request);