From: Herbert Xu <herbert@gondor.apana.org.au>
Date: Sun, 30 Oct 2005 00:20:59 +0000 (+1100)
Subject: [DCCP]: Set socket owner iff packet is not data
X-Git-Tag: firefly_0821_release~39876^2~46^2~1
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=edc9e81917157d1e73bf081d4fbcad7c34d32783;p=firefly-linux-kernel-4.4.55.git

[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 <herbert@gondor.apana.org.au>
Signed-off-by: Arnaldo Carvalho de Melo <acme@mandriva.com>
---

diff --git a/net/dccp/output.c b/net/dccp/output.c
index c25b0423887a..74ff87025878 100644
--- a/net/dccp/output.c
+++ b/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;