linux-kernel - Re: [PATCH] Fix repeatable Oops on container destroy with conntrack

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Date:	Mon, 12 Sep 2011 10:25:24 +0300
From:	Alexey Dobriyan <adobriyan@...il.com>
To:	Alex Bligh <alex@...x.org.uk>
Cc:	netfilter-devel@...r.kernel.org, netfilter@...r.kernel.org,
	coreteam@...filter.org, linux-kernel@...r.kernel.org,
	containers@...ts.linux-foundation.org,
	Linux Containers <containers@...ts.osdl.org>
Subject: Re: [PATCH] Fix repeatable Oops on container destroy with conntrack

On Sat, Sep 10, 2011 at 07:48:43PM +0100, Alex Bligh wrote:
> --- a/net/netfilter/nf_conntrack_netlink.c
> +++ b/net/netfilter/nf_conntrack_netlink.c
> @@ -570,6 +570,11 @@ ctnetlink_conntrack_event(unsigned int events, struct nf_ct_event *item)
>  		return 0;
> 
>  	net = nf_ct_net(ct);
> +
> +	/* container deinit, netlink may have died before death_by_timeout */
> +	if (!net->nfnl)
> +		return 0;
> +
>  	if (!item->report && !nfnetlink_has_listeners(net, group))
>  		return 0;

If this is correct fix, ->nfnl check should be folded into
nfnetlink_has_listeners(), otherwise expectations aren't covered.
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