netdev - [PATCH]

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Date:	Thu, 26 Sep 2013 08:27:07 -0700
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Nikolay Aleksandrov <nikolay@...hat.com>,
	Daniel Borkmann <dborkman@...hat.com>
Cc:	netdev@...r.kernel.org, davem@...emloft.net, andy@...yhouse.net,
	fubar@...ibm.com, vfalico@...hat.com
Subject: [PATCH]

On Thu, 2013-09-26 at 16:09 +0200, Nikolay Aleksandrov wrote:
> Factor out the code that extracts the ports from skb_flow_dissect and
> add a new function skb_flow_get_ports which can be re-used.
> 
> Suggested-by: Veaceslav Falico <vfalico@...hat.com>
> Signed-off-by: Nikolay Aleksandrov <nikolay@...hat.com>
> ---
> v2: new patch
> v3: fix a bug in skb_flow_dissect where thoff didn't have poff added by
>     modifying thoff directly in skb_flow_get_ports as it's done anyway.
>     Also add the necessary export symbol for skb_flow_get_ports.
> This seems like a good idea because there're other users that can re-use
> it later as well.

Wait a minute.... existing code seems buggy.

Daniel, any objection if I submit this fix ?

(commit 8ed781668dd49b608f)

diff --git a/net/core/flow_dissector.c b/net/core/flow_dissector.c
index 1929af8..8d7d0dd 100644
--- a/net/core/flow_dissector.c
+++ b/net/core/flow_dissector.c
@@ -154,8 +154,8 @@ ipv6:
 	if (poff >= 0) {
 		__be32 *ports, _ports;
 
-		nhoff += poff;
-		ports = skb_header_pointer(skb, nhoff, sizeof(_ports), &_ports);
+		ports = skb_header_pointer(skb, nhoff + poff,
+					   sizeof(_ports), &_ports);
 		if (ports)
 			flow->ports = *ports;
 	}



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