This is a note to let you know that I've just added the patch titled sctp: listen on the sock only when it's state is listening or closed to the 3.18-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: sctp-listen-on-the-sock-only-when-it-s-state-is-listening-or-closed.patch and it can be found in the queue-3.18 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. >From foo@baz Sun Apr 30 15:50:51 CEST 2017 From: Xin Long <lucien.xin@xxxxxxxxx> Date: Thu, 6 Apr 2017 13:10:52 +0800 Subject: sctp: listen on the sock only when it's state is listening or closed From: Xin Long <lucien.xin@xxxxxxxxx> [ 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@xxxxxxxxxx> Tested-by: Andrey Konovalov <andreyknvl@xxxxxxxxxx> Signed-off-by: Xin Long <lucien.xin@xxxxxxxxx> Acked-by: Marcelo Ricardo Leitner <marcelo.leitner@xxxxxxxxx> Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- net/sctp/socket.c | 3 +++ 1 file changed, 3 insertions(+) --- a/net/sctp/socket.c +++ b/net/sctp/socket.c @@ -6400,6 +6400,9 @@ int sctp_inet_listen(struct socket *sock 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)) Patches currently in stable-queue which might be from lucien.xin@xxxxxxxxx are queue-3.18/sctp-listen-on-the-sock-only-when-it-s-state-is-listening-or-closed.patch