netdev - Re: [Bugme-new] [Bug 9758] New: net_device refcnt bug when NFQUEUEing bridged packets

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Date:	Wed, 16 Jan 2008 05:59:21 +0100
From:	Patrick McHardy <kaber@...sh.net>
To:	jckn@....net,
	Netfilter Development Mailinglist 
	<netfilter-devel@...r.kernel.org>
CC:	Andrew Morton <akpm@...ux-foundation.org>, netdev@...r.kernel.org,
	bugme-daemon@...zilla.kernel.org
Subject: Re: [Bugme-new] [Bug 9758] New: net_device refcnt bug when NFQUEUEing
 bridged packets

Patrick McHardy wrote:
> Very nice catch, that explains quite a few bug reports about
> refcnt leaks. Your patch looks correct and performs the copying
> in the logically correct place, it would be nicer to keep this
> crap limited to bridge netfilter however.
> 
> What should work is to perform the copying in br_netfilter.c
> at the spots where phsyoutdev is assigned. As an optimization
> we should be able to avoid the copying in most cases by
> checking that the bridge info has a refcount above 1.
> 
> Could you test whether this patch also fixes the problem?


That patch had a bug, we need to set the refcount of the
new bridge info to 1 after performing the copy.


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