[DCCP]: Set socket owner iff packet is not data

Here is a complimentary insurance policy for those feeling a bit insecure.
You don't have to accept this.  However, if you do, you can't blame me for
it :)
  
> 1) dccp_transmit_skb sets the owner for all packets except data packets.
  
We can actually verify this by looking at pkt_type.
  
Signed-off-by: Herbert Xu <[email protected]>
Signed-off-by: Arnaldo Carvalho de Melo <[email protected]>

net/dccp/output.c

@@ -58,10 +58,21 @@ static int dccp_transmit_skb(struct sock *sk, struct sk_buff *skb)
 		switch (dcb->dccpd_type) {
 		case DCCP_PKT_DATA:
 			set_ack = 0;
+			/* fall through */
+		case DCCP_PKT_DATAACK:
 			break;
+
 		case DCCP_PKT_SYNC:
 		case DCCP_PKT_SYNCACK:
 			ackno = dcb->dccpd_seq;
+			/* fall through */
+		default:
+			/*
+			 * Only data packets should come through with skb->sk
+			 * set.
+			 */
+			WARN_ON(skb->sk);
+			skb_set_owner_w(skb, sk);
 			break;
 		}
 
@@ -71,12 +82,6 @@ static int dccp_transmit_skb(struct sock *sk, struct sk_buff *skb)
 		skb->h.raw = skb_push(skb, dccp_header_size);
 		dh = dccp_hdr(skb);
 
-		/*
-		 * Only data packets should come through with skb->sk set.
-		 */
-		if (!skb->sk)
-			skb_set_owner_w(skb, sk);
-
 		/* Build DCCP header and checksum it. */
 		memset(dh, 0, dccp_header_size);
 		dh->dccph_type	= dcb->dccpd_type;