netdev - Re: [PATCH v2 net-next 1/4] flow_keys: include thoff into flow

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Date:	Tue, 19 Mar 2013 08:38:18 -0700
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Daniel Borkmann <dborkman@...hat.com>
Cc:	netdev@...r.kernel.org, davem@...emloft.net, jasowang@...hat.com
Subject: Re: [PATCH v2 net-next 1/4] flow_keys: include thoff into flow_keys
 for later usage

On Tue, 2013-03-19 at 08:03 -0700, Eric Dumazet wrote:
> On Tue, 2013-03-19 at 15:34 +0100, Daniel Borkmann wrote:
> > In skb_flow_dissect(), we perform a dissection of a skbuff. Since we're
> > doing the work here anyway, also store thoff for a later usage, e.g. in
> > the BPF filter. Also, by having thoff 16 Bit, we do not need to pack
> > flow_keys and reorder choke_skb_cb.
> > 
> > Suggested-by: Eric Dumazet <edumazet@...gle.com>
> > Signed-off-by: Daniel Borkmann <dborkman@...hat.com>
> > ---
> >  This patch also needs to go into the net tree, since Eric or Jason will
> >  post a bug fix on top of this one.
> > 
> >  include/net/flow_keys.h   | 1 +
> >  net/core/flow_dissector.c | 5 ++++-
> >  2 files changed, 5 insertions(+), 1 deletion(-)
> 
> Oh well, you left the choke_skb_cb description in changelog
> 
> Acked-by: Eric Dumazet <edumazet@...gle.com>
> 

Actually this patch has a bug

the nhoff variable should stay as an int, or a malicious user could
trigger an infinite loop with a big packet, as nhoff could wrap.




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