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sctp: listen on the sock only when it's state is listening or closed
Now sctp doesn't check sock's state before listening on it. It could even cause changing a sock with any state to become a listening sock when doing sctp_listen. This patch is to fix it by checking sock's state in sctp_listen, so that it will listen on the sock with right state. Reported-by: Andrey Konovalov <andreyknvl@google.com> Tested-by: Andrey Konovalov <andreyknvl@google.com> 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>
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@ -7034,6 +7034,9 @@ int sctp_inet_listen(struct socket *sock, int backlog)
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if (sock->state != SS_UNCONNECTED)
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goto out;
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if (!sctp_sstate(sk, LISTENING) && !sctp_sstate(sk, CLOSED))
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goto out;
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/* If backlog is zero, disable listening. */
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if (!backlog) {
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if (sctp_sstate(sk, CLOSED))
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