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

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Message-ID: <536B6AFD.40303@huawei.com>
Date:	Thu, 8 May 2014 19:31:09 +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 19:26, 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?

Regards
Wang

>>>  	return 0;
>>>  }
>>>  
>>> -- 
>>> 1.7.12
>>>
>>>
>>>
>> --
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>>
> 


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