diff mbox series

[mptcp-next,v4,02/12] mptcp: Return EPIPE if sending is shut down during a sendmsg

Message ID 20200724011127.363638-3-mathew.j.martineau@linux.intel.com
State Accepted, archived
Delegated to: Matthieu Baerts
Headers show
Series DATA_FIN support | expand

Commit Message

Mat Martineau July 24, 2020, 1:11 a.m. UTC 
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>
---
 net/mptcp/protocol.c | 5 +++++
 1 file changed, 5 insertions(+)
diff mbox series

Patch

diff --git a/net/mptcp/protocol.c b/net/mptcp/protocol.c
index 56cb47439ca3..9e812011c635 100644
--- a/net/mptcp/protocol.c
+++ b/net/mptcp/protocol.c
@@ -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);