From 2fe97a578d7bad3116a89dc8a6692a51e6fc1d9c Mon Sep 17 00:00:00 2001 From: Tung Nguyen Date: Thu, 28 Nov 2019 10:10:05 +0700 Subject: tipc: fix potential memory leak in __tipc_sendmsg() When initiating a connection message to a server side, the connection message is cloned and added to the socket write queue. However, if the cloning is failed, only the socket write queue is purged. It causes memory leak because the original connection message is not freed. This commit fixes it by purging the list of connection message when it cannot be cloned. Fixes: 6787927475e5 ("tipc: buffer overflow handling in listener socket") Reported-by: Hoang Le Signed-off-by: Tung Nguyen Acked-by: Ying Xue Acked-by: Jon Maloy Signed-off-by: David S. Miller --- net/tipc/socket.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) (limited to 'net') diff --git a/net/tipc/socket.c b/net/tipc/socket.c index a1c8d722ca20..7baed2c2c93d 100644 --- a/net/tipc/socket.c +++ b/net/tipc/socket.c @@ -1447,8 +1447,10 @@ static int __tipc_sendmsg(struct socket *sock, struct msghdr *m, size_t dlen) rc = tipc_msg_build(hdr, m, 0, dlen, mtu, &pkts); if (unlikely(rc != dlen)) return rc; - if (unlikely(syn && !tipc_msg_skb_clone(&pkts, &sk->sk_write_queue))) + if (unlikely(syn && !tipc_msg_skb_clone(&pkts, &sk->sk_write_queue))) { + __skb_queue_purge(&pkts); return -ENOMEM; + } trace_tipc_sk_sendmsg(sk, skb_peek(&pkts), TIPC_DUMP_SK_SNDQ, " "); rc = tipc_node_xmit(net, &pkts, dnode, tsk->portid); -- cgit v1.2.3