From: Xin Long <lucien.xin@gmail.com>
Date: Thu, 6 Apr 2017 05:10:52 +0000 (+0800)
Subject: sctp: listen on the sock only when it's state is listening or closed
X-Git-Tag: Ubuntu-snapdragon-4.4.0-1059.63~649
X-Git-Url: https://git.proxmox.com/?a=commitdiff_plain;h=d7ba3610880f2a965c8ea4bfcaeb6d96549388b5;p=mirror_ubuntu-zesty-kernel.git

sctp: listen on the sock only when it's state is listening or closed

BugLink: http://bugs.launchpad.net/bugs/1688505

[ Upstream commit 34b2789f1d9bf8dcca9b5cb553d076ca2cd898ee ]

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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Stefan Bader <stefan.bader@canonical.com>
Signed-off-by: Thadeu Lima de Souza Cascardo <cascardo@canonical.com>
---

diff --git a/net/sctp/socket.c b/net/sctp/socket.c
index 5758818435f3..c96d666cef29 100644
--- a/net/sctp/socket.c
+++ b/net/sctp/socket.c
@@ -6394,6 +6394,9 @@ int sctp_inet_listen(struct socket *sock, int backlog)
 	if (sock->state != SS_UNCONNECTED)
 		goto out;
 
+	if (!sctp_sstate(sk, LISTENING) && !sctp_sstate(sk, CLOSED))
+		goto out;
+
 	/* If backlog is zero, disable listening. */
 	if (!backlog) {
 		if (sctp_sstate(sk, CLOSED))