netdev - Re: [PATCH 1/2] ipv4: fix do_ip_setsockopt optlen check for IP_MULTICAST

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Date:	Tue, 22 Sep 2009 13:38:19 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	shanwei@...fujitsu.com
Cc:	dfeng@...hat.com, kaber@...sh.net, yoshfuji@...ux-ipv6.org,
	jmorris@...ei.org, pekkas@...core.fi, kuznet@....inr.ac.ru,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] ipv4: fix do_ip_setsockopt optlen check for
 IP_MULTICAST_IF

From: Shan Wei <shanwei@...fujitsu.com>
Date: Thu, 17 Sep 2009 17:15:22 +0800

> Xiaotian Feng wrote, at 09/17/2009 01:19 PM:
>> Due to man page of setsockopt, if optlen is not valid, kernel should return
>> -EINVAL. But a simple testcase as following, errno is 0, which means setsockopt
>> is successful.
>> 
>>         addr.s_addr = inet_addr("192.1.2.3");
>>         setsockopt(s, IPPROTO_IP, IP_MULTICAST_IF, &addr, 1);
>> 	printf("errno is %d\n", errno);
>> 
>> This patch fixes the optlen check part, with the patch, we got errno EINVAL.
>> 
> 
> I also think it's a bug, the freebsd also does the optlen check. 
> But the style should be coincident with other option: firstly check the
> availability of optlen, then copy option value from user and deal with it.   
> 
> How about this one:

This definitely is better and cleaner, but please don't post such
things without proper signoffs and commit messages because now
I have to ask you to do that instead of me just applying your
patch :-/
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