netdev - Re: [PATCH net-next] sctp: add a checking for sctp_sysctl_net

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Message-ID: <536B712F.70707@huawei.com>
Date:	Thu, 8 May 2014 19:57:35 +0800
From:	Wang Weidong <wangweidong1@...wei.com>
To:	Neil Horman <nhorman@...driver.com>
CC:	David Miller <davem@...emloft.net>,
	Vlad Yasevich <vyasevich@...il.com>,
	Daniel Borkmann <dborkman@...hat.com>,
	<linux-sctp@...r.kernel.org>, <netdev@...r.kernel.org>
Subject: Re: [PATCH net-next] sctp: add a checking for sctp_sysctl_net_register

On 2014/5/8 19:41, Neil Horman wrote:
> On Thu, May 08, 2014 at 07:31:09PM +0800, Wang Weidong wrote:
>> On 2014/5/8 19:26, Wang Weidong wrote:
>>> On 2014/5/8 19:11, Neil Horman wrote:
>>>> On Thu, May 08, 2014 at 03:55:05PM +0800, Wang Weidong wrote:
>>>>> When register_net_sysctl failed, we should free the
>>>>> sysctl_table while the net_namespace is not init_net.
>>>>>
>>>>> Signed-off-by: Wang Weidong <wangweidong1@...wei.com>
>>>>> ---
>>>>>  net/sctp/sysctl.c | 5 +++++
>>>>>  1 file changed, 5 insertions(+)
>>>>>
>>>>> diff --git a/net/sctp/sysctl.c b/net/sctp/sysctl.c
>>>>> index 844d2b0..4c17694 100644
>>>>> --- a/net/sctp/sysctl.c
>>>>> +++ b/net/sctp/sysctl.c
>>>>> @@ -450,6 +450,11 @@ int sctp_sysctl_net_register(struct net *net)
>>>>>  	}
>>>>>  
>>>>>  	net->sctp.sysctl_header = register_net_sysctl(net, "net/sctp", table);
>>>>> +	if (net->sctp.sysctl_header == NULL) {
>>>>> +		if (!net_eq(net, &init_net))
>>>>> +			kfree(table);
>>>>> +		return -ENOMEM;
>>>>> +	}
>>>> Sorry, we're not special casing this in 3 places.  Why not just revert the
>>>> origonal commit so that all the sysctl tables can be handled the same way
>>>> Neil
>>>>
>>> Hi Neil,
>>>
>>> The original commit avoids to kmemdup 
>>>
>> Hi Neil,
>>
>> Sorry for the accomplished mail.
>> Although, revert the original commit, the checking for net->sctp.sysctl_header
>> is need from coding view.
>>
>> What do you think?
>>
> That was my review.  I get that the origional commit avoids kmemdup for the
> init_net case.  My point was that, in so doing you created the need to special
> case the handling of the sysctl table for init_net in 3 places now.  It seems to
> me that, while its always nice to save space, it would be cleaner programming to
> just accept the need for the extra 1.6Kb of space and not have to worry about
> the special casing.
> 
> Neil
> 

Hm, Should I add this:

+	if (net->sctp.sysctl_header == NULL);
+		kfree(table);

to the revert patch or do a new patch?

Regards
Wang

>> Regards
>> Wang
>>
>>>>>  	return 0;
>>>>>  }
>>>>>  
>>>>> -- 
>>>>> 1.7.12
>>>>>
>>>>>
>>>>>
>>>> --
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>>>>
>>>>
>>>
>>
>>
>> --
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> 
> .
> 


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