netdev - Re: [RFC PATCH] net: cgroup: null ptr dereference in netprio cgroup during init

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Date:	Wed, 18 Jul 2012 15:58:25 +0800
From:	Gao feng <gaofeng@...fujitsu.com>
To:	John Fastabend <john.r.fastabend@...el.com>
CC:	davem@...emloft.net, nhorman@...driver.com,
	mark.d.rustad@...el.com, netdev@...r.kernel.org,
	eric.dumazet@...il.com
Subject: Re: [RFC PATCH] net: cgroup: null ptr dereference in netprio cgroup
 during init

于 2012年07月18日 13:50, John Fastabend 写道:
> On 7/17/2012 6:59 PM, Gao feng wrote:
>> 于 2012年07月18日 08:33, John Fastabend 写道:
>>> When the netprio cgroup is built in the kernel cgroup_init will call
>>> cgrp_create which eventually calls update_netdev_tables. This is
>>> being called before do_initcalls() so a null ptr dereference occurs
>>> on init_net.
>>>
> 
> [...]
> 
>>
>>
>> Thanks John.
>> It's my mistake.
>>
>> Can we make sure init_net.count is zero here?
>> I can't find some places to initialize it to zero.
>>
> 
> Its defined in net_namespace.c so it's zeroed by virtue
> of being global. And initialized in setup_net via
> pure_initcall() always after cgroup_init() if I've done
> my accounting correctly.

This looks fine to me.
Thanks John.
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