netdev - Re: [PATCH]IPv6:remove duplicate check of optlen when setsockopt with IPV6

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Date:	Wed, 14 Jan 2009 12:07:55 +0800
From:	Wei Yongjun <yjwei@...fujitsu.com>
To:	Yang Hongyang <yanghy@...fujitsu.com>
CC:	Herbert Xu <herbert@...dor.apana.org.au>, netdev@...r.kernel.org,
	davem@...emloft.net
Subject: Re: [PATCH]IPv6:remove duplicate check of optlen when setsockopt
 with IPV6_PKTINFO option

Yang Hongyang wrote:
> Herbert Xu wrote:
>   
>> Yang Hongyang <yanghy@...fujitsu.com> wrote:
>>     
>>> Actually the condition (optlen == 0) is included in (optlen < sizeof(struct in6_pktinfo)),
>>> so we do not need to check it separately.
>>>       
>> You don't need to check optval == NULL either since that's the
>> job of copy_from_user.
>>     
>
> If optval==NULL, what we should return?EINVAL or EFAULT?
> If it is EINVAL,then we should check it .otherwise it's the job of 
> copy_from_user
>   

I think if optval==NULL, the in6_pktinfo which is set should be remove. 
So, you should handle optval==NULL. Not just return error.

>   
>> Cheers,
>>     
>
>
>   

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