Commit 57baaf28 authored Jul 28, 2020 by Mat Martineau Committed by David S. Miller Jul 28, 2020

mptcp: Return EPIPE if sending is shut down during a sendmsg

A MPTCP socket where sending has been shut down should not attempt to
send additional data, since DATA_FIN has already been sent.

Signed-off-by: Mat Martineau <mathew.j.martineau@linux.intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

parent 0bac966a

net/mptcp/protocol.c

+5 −0

Original line number	Diff line number	Diff line
		@@ -748,6 +748,11 @@ static int mptcp_sendmsg(struct sock sk, struct msghdr msg, size_t len)
		restart:
		mptcp_clean_una(sk);

		if (sk->sk_err \|\| (sk->sk_shutdown & SEND_SHUTDOWN)) {
		ret = -EPIPE;
		goto out;
		}

		wait_for_sndbuf:
		__mptcp_flush_join_list(msk);
		ssk = mptcp_subflow_get_send(msk);