Commit e0878694 authored Jul 30, 2016 by Xin Long Committed by David S. Miller Jul 30, 2016

sctp: allow receiving msg when TCP-style sk is in CLOSED state



Commit 141ddefc ("sctp: change sk state to CLOSED instead of
CLOSING in sctp_sock_migrate") changed sk state to CLOSED if the
assoc is closed when sctp_accept clones a new sk.

If there is still data in sk receive queue, users will not be able
to read it any more, as sctp_recvmsg returns directly if sk state
is CLOSED.

This patch is to add CLOSED state check in sctp_recvmsg to allow
reading data from TCP-style sk with CLOSED state as what TCP does.

Signed-off-by: Xin Long <lucien.xin@gmail.com>
Acked-by: Marcelo Ricardo Leitner <marcelo.leitner@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

parent a0fc6843

net/sctp/socket.c

+1 −1

Original line number	Diff line number	Diff line
		@@ -2079,7 +2079,7 @@ static int sctp_recvmsg(struct sock sk, struct msghdr msg, size_t len,
		lock_sock(sk);

		if (sctp_style(sk, TCP) && !sctp_sstate(sk, ESTABLISHED) &&
		!sctp_sstate(sk, CLOSING)) {
		!sctp_sstate(sk, CLOSING) && !sctp_sstate(sk, CLOSED)) {
		err = -ENOTCONN;
		goto out;
		}

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