netdev - Re: [PATCH] IPv6: Fix the data length of get destination options with short length

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Message-Id: <20080528.201322.26342915.yoshfuji@linux-ipv6.org>
Date:	Wed, 28 May 2008 20:13:22 +0900 (JST)
From:	YOSHIFUJI Hideaki / 吉藤英明 
	<yoshfuji@...ux-ipv6.org>
To:	yanghy@...fujitsu.com
Cc:	netdev@...r.kernel.org, yjwei@...fujitsu.com,
	wangchen@...fujitsu.com, davem@...emloft.net,
	yoshfuji@...ux-ipv6.org
Subject: Re: [PATCH] IPv6: Fix the data length of get destination options
 with short length

In article <483D0070.2090909@...fujitsu.com> (at Wed, 28 May 2008 14:49:20 +0800), Yang Hongyang <yanghy@...fujitsu.com> says:

>   If get destination options with length which is not enough for that
> option,getsockopt() will still return the real length of the option,
> which is larger then the buffer space.
>   This is because ipv6_getsockopt_sticky() returns the real length of
> the option.
> 
> This patch fix this problem.

POSIX says that the object pointed to by the option_len argument shall be
modified to indicate the actual length of the value.
Do you think this change conforms to the spec?

--yoshfuji
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