linux-kernel - Re: [PATCH v2] net: cgroup: fix access the unallocated memory in netprio cgroup

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Message-ID: <4FFCD95A.1060204@cn.fujitsu.com>
Date:	Wed, 11 Jul 2012 09:39:38 +0800
From:	Gao feng <gaofeng@...fujitsu.com>
To:	Eric Dumazet <eric.dumazet@...il.com>
CC:	nhorman@...driver.com, linux-kernel@...r.kernel.org,
	netdev@...r.kernel.org, lizefan@...wei.com, tj@...nel.org,
	Eric Dumazet <edumazet@...gle.com>
Subject: Re: [PATCH v2] net: cgroup: fix access the unallocated memory in
 netprio cgroup

于 2012年07月10日 19:08, Eric Dumazet 写道:
> On Tue, 2012-07-10 at 13:05 +0200, Eric Dumazet wrote:
>> On Tue, 2012-07-10 at 18:44 +0800, Gao feng wrote:
>>> there are some out of bound accesses in netprio cgroup.
>>
>>> -	update_netdev_tables();
>>> +	ret = extend_netdev_table(dev, max_len);
>>> +	if (ret < 0)
>>> +		goto out_free_devname;
>>> +
>>>  	ret = 0;
>>>  	rcu_read_lock();
>>>  	map = rcu_dereference(dev->priomap);
>>
>> Its unfortunately adding a bug.
>>
>> extend_netdev_table() is protected by RTNL.
> 
> Please test your next patch using :
> 
> CONFIG_LOCKDEP=y
> CONFIG_PROVE_RCU=y
> 
> Because rtnl_dereference() should shout if you dont hold RTNL
> 

Oops, I miss it.
Thanks Eric & Neil,I will test v3 patch with these two CONFIG.

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