sctp: use limited socket backlog

Make sctp adapt to the limited socket backlog change.

Cc: Vlad Yasevich <vladislav.yasevich@hp.com>
Cc: Sridhar Samudrala <sri@us.ibm.com>
Signed-off-by: Zhu Yi <yi.zhu@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/sctp/socket.c b/net/sctp/socket.c
index f6d1e59..dfc5c12 100644
--- a/net/sctp/socket.c
+++ b/net/sctp/socket.c
@@ -3720,6 +3720,9 @@
 	SCTP_DBG_OBJCNT_INC(sock);
 	percpu_counter_inc(&sctp_sockets_allocated);
 
+	/* Set socket backlog limit. */
+	sk->sk_backlog.limit = sysctl_sctp_rmem[1];
+
 	local_bh_disable();
 	sock_prot_inuse_add(sock_net(sk), sk->sk_prot, 1);
 	local_bh_enable();