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

[Eric Dumazet]

Le lundi 05 juillet 2010 Ã 21:22 +0800, Herbert Xu a Ãcrit :
> On Mon, Jul 05, 2010 at 02:59:14PM +0200, Eric Dumazet wrote:
> >
> > Why do we clear full 48 bytes skb->cb[] in skb_alloc(), if no protocol
> > stack should rely it being zero ?
> 
> Unless a protocol is allocating the skb itself, then the fact
> that skb_alloc clears skb->cb is no guarantee that the skb->cb
> will be zero.

I see. We could :

Avoid this memset(skb->cb, 0, sizeof(skb->cb)) in fastpath.

or in debug mode, poison it to trigger errors more often.

Thanks


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