From 34b2789f1d9bf8dcca9b5cb553d076ca2cd898ee Mon Sep 17 00:00:00 2001
From: Xin Long <lucien.xin@gmail.com>
Date: Thu, 6 Apr 2017 13:10:52 +0800
Subject: [PATCH] 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>
---
net/sctp/socket.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/net/sctp/socket.c b/net/sctp/socket.c
index c1401f43d40f..d9d4c92e06b3 100644
--- a/net/sctp/socket.c
+++ b/net/sctp/socket.c
@@ -7034,6 +7034,9 @@ 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))
--
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