Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67;
From:   Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To:     linux-kernel@vger.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        stable@vger.kernel.org, Andy Strohman <andy@uplevelsystems.com>,
        Johannes Berg <johannes.berg@intel.com>
Subject: [PATCH 5.1 119/121] nl80211: fix station_info pertid memory leak
Date:   Mon, 24 Jun 2019 17:57:31 +0800
Message-Id: <20190624092326.692565391@linuxfoundation.org>
In-Reply-To: <20190624092320.652599624@linuxfoundation.org>
References: <20190624092320.652599624@linuxfoundation.org>
User-Agent: quilt/0.66
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

From: Andy Strohman <andrew@andrewstrohman.com>

commit f77bf4863dc2218362f4227d56af4a5f3f08830c upstream.

When dumping stations, memory allocated for station_info's
pertid member will leak if the nl80211 header cannot be added to
the sk_buff due to insufficient tail room.

I noticed this leak in the kmalloc-2048 cache.

Cc: stable@vger.kernel.org
Fixes: 8689c051a201 ("cfg80211: dynamically allocate per-tid stats for station info")
Signed-off-by: Andy Strohman <andy@uplevelsystems.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 net/wireless/nl80211.c |    4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

--- a/net/wireless/nl80211.c
+++ b/net/wireless/nl80211.c
@@ -4804,8 +4804,10 @@ static int nl80211_send_station(struct s
 	struct nlattr *sinfoattr, *bss_param;
 
 	hdr = nl80211hdr_put(msg, portid, seq, flags, cmd);
-	if (!hdr)
+	if (!hdr) {
+		cfg80211_sinfo_release_content(sinfo);
 		return -1;
+	}
 
 	if (nla_put_u32(msg, NL80211_ATTR_IFINDEX, dev->ifindex) ||
 	    nla_put(msg, NL80211_ATTR_MAC, ETH_ALEN, mac_addr) ||