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

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Date:	Thu, 24 Sep 2009 15:44:33 -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: Wed, 23 Sep 2009 09:41:10 +0800

> [PATCH BUGFIX] ipv4: check optlen for IP_MULTICAST_IF option
> 
> 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);
> 
> Xiaotian Feng(dfeng@...hat.com) caught the bug. We fix it firstly checking
> the availability of optlen and then dealing with the logic like other options. 
> 
> Reported-by: Xiaotian Feng <dfeng@...hat.com> 
> Signed-off-by: Shan Wei <shanwei@...fujitsu.com>
> Acked-by: Alexey Kuznetsov <kuznet@....inr.ac.ru>

Applied.
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