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tipc: fix potential memory leak in __tipc_sendmsg()

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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: 6787927475 ("tipc: buffer overflow handling in listener socket")
Reported-by: Hoang Le <hoang.h.le@dektech.com.au>
Signed-off-by: Tung Nguyen <tung.q.nguyen@dektech.com.au>
Acked-by: Ying Xue <ying.xue@windriver.com>
Acked-by: Jon Maloy <jon.maloy@ericsson.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Tung Nguyen 2019-11-28 10:10:05 +07:00 committed by David S. Miller
parent 61183b056b
commit 2fe97a578d
1 changed files with 3 additions and 1 deletions
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4
net/tipc/socket.c
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@ -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);