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

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Message-ID: <1278334754.2877.173.camel@edumazet-laptop>
Date:	Mon, 05 Jul 2010 14:59:14 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Herbert Xu <herbert@...dor.apana.org.au>
Cc:	yoshfuji@...ux-ipv6.org, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Stephen Hemminger <shemminger@...tta.com>
Subject: Re: Fwd: Possible bug in net/ipv4/route.c?

Le lundi 05 juillet 2010 à 20:06 +0800, Herbert Xu a écrit :
> Eric Dumazet <eric.dumazet@...il.com> 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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