[PATCH 3.13.y-ckt 116/139] cfg80211: avoid mem leak on driver hint set

[Kamal Mostafa]

3.13.11-ckt15 -stable review patch.  If anyone has any objections, please let me know.

------------------

From: Arik Nemtsov <arik at wizery.com>

commit 34f05f543f02350e920bddb7660ffdd4697aaf60 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 at intel.com>
Acked-by: Luis R. Rodriguez <mcgrof at suse.com>
Signed-off-by: Johannes Berg <johannes.berg at intel.com>
[ kamal: backport to 3.13-stable: context ]
Signed-off-by: Kamal Mostafa <kamal at canonical.com>
---
 net/wireless/reg.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/net/wireless/reg.c b/net/wireless/reg.c
index 7da67fd..e90e22f 100644
--- a/net/wireless/reg.c
+++ b/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);
-- 
1.9.1