linux-kernel - [PATCH 3.12 080/176] cfg80211: avoid mem leak on driver hint set

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Date:	Wed, 28 Jan 2015 15:28:30 +0100
From:	Jiri Slaby <jslaby@...e.cz>
To:	stable@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, Arik Nemtsov <arik@...ery.com>,
	Arik Nemtsov <arikx.nemtsov@...el.com>,
	Johannes Berg <johannes.berg@...el.com>,
	Jiri Slaby <jslaby@...e.cz>
Subject: [PATCH 3.12 080/176] cfg80211: avoid mem leak on driver hint set

From: Arik Nemtsov <arik@...ery.com>

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

===============

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.

[js: backport to 3.12]

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: Jiri Slaby <jslaby@...e.cz>
---
 net/wireless/reg.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/net/wireless/reg.c b/net/wireless/reg.c
index de06d5d1287f..8eedb1507ccc 100644
--- a/net/wireless/reg.c
+++ b/net/wireless/reg.c
@@ -1432,7 +1432,7 @@ 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;
@@ -1448,7 +1448,9 @@ __regulatory_hint(struct wiphy *wiphy,
 				kfree(pending_request);
 				return PTR_ERR(regd);
 			}
+			tmp = get_wiphy_regdom(wiphy);
 			rcu_assign_pointer(wiphy->regd, regd);
+			rcu_free_regdom(tmp);
 		}
 		intersect = true;
 		break;
@@ -1468,7 +1470,9 @@ __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);
-- 
2.2.2

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