Commit 38a35450 authored Oct 07, 2024 by Xin Long Committed by Greg Kroah-Hartman Nov 08, 2024

sctp: ensure sk_state is set to CLOSED if hashing fails in sctp_listen_start



[ Upstream commit 4d5c70e6155d5eae198bade4afeab3c1b15073b6 ]

If hashing fails in sctp_listen_start(), the socket remains in the
LISTENING state, even though it was not added to the hash table.
This can lead to a scenario where a socket appears to be listening
without actually being accessible.

This patch ensures that if the hashing operation fails, the sk_state
is set back to CLOSED before returning an error.

Note that there is no need to undo the autobind operation if hashing
fails, as the bind port can still be used for next listen() call on
the same socket.

Fixes: 76c6d988 ("sctp: add sock_reuseport for the sock in __sctp_hash_endpoint")
Reported-by: Marcelo Ricardo Leitner <marcelo.leitner@gmail.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>
Signed-off-by: Sasha Levin <sashal@kernel.org>

parent ed494a60

net/sctp/socket.c

+13 −5

Original line number	Diff line number	Diff line
		@@ -8370,6 +8370,7 @@ static int sctp_listen_start(struct sock *sk, int backlog)
		struct sctp_endpoint *ep = sp->ep;
		struct crypto_shash *tfm = NULL;
		char alg[32];
		int err;

		/* Allocate HMAC for generating cookie. */
		if (!sp->hmac && sp->sctp_hmac_alg) {
		@@ -8397,18 +8398,25 @@ static int sctp_listen_start(struct sock *sk, int backlog)
		inet_sk_set_state(sk, SCTP_SS_LISTENING);
		if (!ep->base.bind_addr.port) {
		if (sctp_autobind(sk)) {
		inet_sk_set_state(sk, SCTP_SS_CLOSED);
		return -EAGAIN;
		err = -EAGAIN;
		goto err;
		}
		} else {
		if (sctp_get_port(sk, inet_sk(sk)->inet_num)) {
		inet_sk_set_state(sk, SCTP_SS_CLOSED);
		return -EADDRINUSE;
		err = -EADDRINUSE;
		goto err;
		}
		}

		WRITE_ONCE(sk->sk_max_ack_backlog, backlog);
		return sctp_hash_endpoint(ep);
		err = sctp_hash_endpoint(ep);
		if (err)
		goto err;

		return 0;
		err:
		inet_sk_set_state(sk, SCTP_SS_CLOSED);
		return err;
		}

		/*