cfg80211: avoid mem leak on driver hint set

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.

Cc: stable@vger.kernel.org
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>

1 files changed, 4 insertions, 1 deletions

diff --git a/net/wireless/reg.c b/net/wireless/reg.c
index 47be6163381c..7ddd16a51adf 100644
--- a/net/wireless/reg.c
+++ b/net/wireless/reg.c
@@ -1907,7 +1907,7 @@ static enum reg_request_treatment
 reg_process_hint_driver(struct wiphy *wiphy,
                         struct regulatory_request *driver_request)
 {
-        const struct ieee80211_regdomain *regd;
+        const struct ieee80211_regdomain *regd, *tmp;
         enum reg_request_treatment treatment;
 
         treatment = __reg_process_hint_driver(driver_request);
@@ -1927,7 +1927,10 @@ reg_process_hint_driver(struct wiphy *wiphy,
                         reg_free_request(driver_request);
                         return REG_REQ_IGNORE;
                 }
+
+                tmp = get_wiphy_regdom(wiphy);
                 rcu_assign_pointer(wiphy->regd, regd);
+                rcu_free_regdom(tmp);
         }