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

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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>
This commit is contained in:
Mat Martineau 2020-07-28 15:12:00 -07:00 committed by David S. Miller
parent 0bac966a1f
commit 57baaf2875
1 changed files with 5 additions and 0 deletions
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5
net/mptcp/protocol.c
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@ -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);