linux-kernel - [PATCH 3.18 145/145] dccp: fix memory leak during tear-down of unsuccessful connection request

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Message-Id: <20170416080208.199573252@linuxfoundation.org>
Date:   Sun, 16 Apr 2017 12:50:38 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Jianwen Ji <jiji@...hat.com>,
        Hannes Frederic Sowa <hannes@...essinduktion.org>,
        "David S. Miller" <davem@...emloft.net>
Subject: [PATCH 3.18 145/145] dccp: fix memory leak during tear-down of unsuccessful connection request

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

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

From: Hannes Frederic Sowa <hannes@...essinduktion.org>

commit 72ef9c4125c7b257e3a714d62d778ab46583d6a3 upstream.

This patch fixes a memory leak, which happens if the connection request
is not fulfilled between parsing the DCCP options and handling the SYN
(because e.g. the backlog is full), because we forgot to free the
list of ack vectors.

Reported-by: Jianwen Ji <jiji@...hat.com>
Signed-off-by: Hannes Frederic Sowa <hannes@...essinduktion.org>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 net/dccp/ccids/ccid2.c |    1 +
 1 file changed, 1 insertion(+)

--- a/net/dccp/ccids/ccid2.c
+++ b/net/dccp/ccids/ccid2.c
@@ -749,6 +749,7 @@ static void ccid2_hc_tx_exit(struct sock
 	for (i = 0; i < hc->tx_seqbufc; i++)
 		kfree(hc->tx_seqbuf[i]);
 	hc->tx_seqbufc = 0;
+	dccp_ackvec_parsed_cleanup(&hc->tx_av_chunks);
 }

 static void ccid2_hc_rx_packet_recv(struct sock *sk, struct sk_buff *skb)