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

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Message-ID: <20100706002813.GA11194@gondor.apana.org.au>
Date:	Tue, 6 Jul 2010 08:28:13 +0800
From:	Herbert Xu <herbert@...dor.apana.org.au>
To:	Stephen Hemminger <shemminger@...tta.com>
Cc:	Sol Kavy <skavy@...com.com>, linux-kernel@...r.kernel.org,
	gren@...com.com, gjin@...com.com, msezgin@...com.com,
	silgen@...com.com, "David S. Miller" <davem@...emloft.net>,
	netdev@...r.kernel.org
Subject: Re: Possible bug in net/ipv4/route.c?

On Mon, Jul 05, 2010 at 11:03:28AM -0700, Stephen Hemminger wrote:
>
> The problem is that br_dev_xmit is looking at flags in the CB[] that
> are uninitialized.
> 
> if br_dev_xmit cleared the CB at [A] the mrouters_only would always be zero
> at [B].
> 
> Where should the mrouters and igmp_only fields in skb be initialized?

They are initialised in br_multicast_rcv.

Anyway, this isn't the problem here.  The problem is that before
bridge netfilter passes a packet through IPv4 through ARP, it must
ensure that the cb used by IPv4 is cleared.

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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