linux-kernel - [PATCH 3.18 059/183] cfg80211: avoid mem leak on driver hint set

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Message-Id: <20150125180812.747492119@linuxfoundation.org>
Date:	Sun, 25 Jan 2015 10:06:21 -0800
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org, Arik Nemtsov <arikx.nemtsov@...el.com>,
	"Luis R. Rodriguez" <mcgrof@...e.com>,
	Johannes Berg <johannes.berg@...el.com>
Subject: [PATCH 3.18 059/183] cfg80211: avoid mem leak on driver hint set

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

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

From: Arik Nemtsov <arik@...ery.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@...el.com>
Acked-by: Luis R. Rodriguez <mcgrof@...e.com>
Signed-off-by: Johannes Berg <johannes.berg@...el.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 net/wireless/reg.c |    5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

--- a/net/wireless/reg.c
+++ b/net/wireless/reg.c
@@ -1760,7 +1760,7 @@ 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);
@@ -1780,7 +1780,10 @@ reg_process_hint_driver(struct wiphy *wi
 			reg_free_request(driver_request);
 			return REG_REQ_IGNORE;
 		}
+
+		tmp = get_wiphy_regdom(wiphy);
 		rcu_assign_pointer(wiphy->regd, regd);
+		rcu_free_regdom(tmp);
 	}
 
 


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