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

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Message-ID: <20100705120617.GA6267@gondor.apana.org.au>
Date:	Mon, 5 Jul 2010 20:06:17 +0800
From:	Herbert Xu <herbert@...dor.apana.org.au>
To:	Eric Dumazet <eric.dumazet@...il.com>
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?

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.

Please fix the bridge instead as it's doing the IP injection.

Cheers,
-- 
Email: Herbert Xu <herbert@...dor.apana.org.au>
Home Page: http://gondor.apana.org.au/~herbert/
PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt
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