linux-kernel - [PATCH 3.19.y-ckt 078/164] nl80211: Fix potential memory leak from parse_acl

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Message-Id: <1449075615-20754-79-git-send-email-kamal@canonical.com>
Date:	Wed,  2 Dec 2015 08:58:49 -0800
From:	Kamal Mostafa <kamal@...onical.com>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	kernel-team@...ts.ubuntu.com
Cc:	Ola Olsson <ola.olsson@...ymobile.com>,
	Johannes Berg <johannes.berg@...el.com>,
	Kamal Mostafa <kamal@...onical.com>
Subject: [PATCH 3.19.y-ckt 078/164] nl80211: Fix potential memory leak from parse_acl_data

3.19.8-ckt11 -stable review patch.  If anyone has any objections, please let me know.

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

From: Ola Olsson <ola1olsson@...il.com>

commit 4baf6bea37247e59f1971e8009d13aeda95edba2 upstream.

If parse_acl_data succeeds but the subsequent parsing of smps
attributes fails, there will be a memory leak due to early returns.
Fix that by moving the ACL parsing later.

Fixes: 18998c381b19b ("cfg80211: allow requesting SMPS mode on ap start")
Signed-off-by: Ola Olsson <ola.olsson@...ymobile.com>
Signed-off-by: Johannes Berg <johannes.berg@...el.com>
Signed-off-by: Kamal Mostafa <kamal@...onical.com>
---
 net/wireless/nl80211.c | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

diff --git a/net/wireless/nl80211.c b/net/wireless/nl80211.c
index e13325f..49cc71c 100644
--- a/net/wireless/nl80211.c
+++ b/net/wireless/nl80211.c
@@ -3388,12 +3388,6 @@ static int nl80211_start_ap(struct sk_buff *skb, struct genl_info *info)
 				     wdev->iftype))
 		return -EINVAL;
 
-	if (info->attrs[NL80211_ATTR_ACL_POLICY]) {
-		params.acl = parse_acl_data(&rdev->wiphy, info);
-		if (IS_ERR(params.acl))
-			return PTR_ERR(params.acl);
-	}
-
 	if (info->attrs[NL80211_ATTR_SMPS_MODE]) {
 		params.smps_mode =
 			nla_get_u8(info->attrs[NL80211_ATTR_SMPS_MODE]);
@@ -3417,6 +3411,12 @@ static int nl80211_start_ap(struct sk_buff *skb, struct genl_info *info)
 		params.smps_mode = NL80211_SMPS_OFF;
 	}
 
+	if (info->attrs[NL80211_ATTR_ACL_POLICY]) {
+		params.acl = parse_acl_data(&rdev->wiphy, info);
+		if (IS_ERR(params.acl))
+			return PTR_ERR(params.acl);
+	}
+
 	wdev_lock(wdev);
 	err = rdev_start_ap(rdev, dev, &params);
 	if (!err) {
-- 
1.9.1

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