Re: Fwd: Possible bug in net/ipv4/route.c?

[Eric Dumazet]

Le lundi 05 juillet 2010 Ã 20:06 +0800, Herbert Xu a Ãcrit :
> Eric Dumazet <eric.dumazet@xxxxxxxxx> wrote:
> >
> >> 2) The layer using skb->cb[] should clear this area after use and
> >> before handing the skb to another layer.  Ubicom should modify the
> >> driver to clear the skb->cb[] area before sending it up the line.
> >> 
> > 
> > This is the right option. If you use one word in cb[], only your driver
> > knows how to clear it efficiently.
> 
> Absolutely not! No protocol stack should rely on an external skb
> having a zero cb.
> 

Why do we clear full 48 bytes skb->cb[] in skb_alloc(), if no protocol
stack should rely it being zero ?



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