diff --git a/[refs] b/[refs]
index f501189a5590..42a17a09f6d1 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 811265b8e8bf84e3b91507bf6a3a8eea20e7a4b7
+refs/heads/master: 2b80230a7f8cd346c1e2ebafdd02be432bf10459
diff --git a/trunk/net/dccp/input.c b/trunk/net/dccp/input.c
index f01d588299c8..c74034cf7ede 100644
--- a/trunk/net/dccp/input.c
+++ b/trunk/net/dccp/input.c
@@ -562,6 +562,12 @@ int dccp_rcv_state_process(struct sock *sk, struct sk_buff *skb,
 		return 0;
 	}
 
+	if (unlikely(dh->dccph_type == DCCP_PKT_SYNC)) {
+		dccp_send_sync(sk, DCCP_SKB_CB(skb)->dccpd_seq,
+			       DCCP_PKT_SYNCACK);
+		goto discard;
+	}
+
 	switch (sk->sk_state) {
 	case DCCP_CLOSED:
 		return 1;