[PATCH] nl80211: Fix possible leak in nl80211_new_interface on MONITOR_FLAG_ACTIVE

In case of NL80211_IFTYPE_MONITOR and flag MONITOR_FLAG_ACTIVE, the already
allocated sk_buff 'msg' is not freed, when the function exits in case the
feature is not supported. Detected by Coverity CID 1269116.

Signed-off-by: Christian Engelmayer <redacted>
---
Compile tested only. Applies against linux-next.
---
 net/wireless/nl80211.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/net/wireless/nl80211.c b/net/wireless/nl80211.c
index d78fd8b54515..38a7477dda81 100644
--- a/net/wireless/nl80211.c
+++ b/net/wireless/nl80211.c

@@ -2663,8 +2663,10 @@ static int nl80211_new_interface(struct sk_buff *skb, struct genl_info *info)
 				  &flags);
 
 	if (!err && (flags & MONITOR_FLAG_ACTIVE) &&
-	    !(rdev->wiphy.features & NL80211_FEATURE_ACTIVE_MONITOR))
+	    !(rdev->wiphy.features & NL80211_FEATURE_ACTIVE_MONITOR)) {
+		nlmsg_free(msg);
 		return -EOPNOTSUPP;
+	}
 
 	wdev = rdev_add_virtual_intf(rdev,
 				nla_data(info->attrs[NL80211_ATTR_IFNAME]),

-- 
1.9.1

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On Sat, 2015-02-14 at 20:52 +0100, Christian Engelmayer wrote:

In case of NL80211_IFTYPE_MONITOR and flag MONITOR_FLAG_ACTIVE, the already
allocated sk_buff 'msg' is not freed, when the function exits in case the
feature is not supported. Detected by Coverity CID 1269116.

Signed-off-by: Christian Engelmayer <redacted>
---
Compile tested only. Applies against linux-next.

Thanks for the report. I've fixed this in a different way.

johannes