netdev - Re: [PATCH] rtnetlink: Fix message size calculation for link messages

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Message-Id: <20101112.105318.226783106.davem@davemloft.net>
Date:	Fri, 12 Nov 2010 10:53:18 -0800 (PST)
From:	David Miller <davem@...emloft.net>
To:	kaber@...sh.net
Cc:	netdev@...r.kernel.org
Subject: Re: [PATCH] rtnetlink: Fix message size calculation for link
 messages

From: Patrick McHardy <kaber@...sh.net>
Date: Fri, 12 Nov 2010 08:43:46 +0100

> On 12.11.2010 02:47, Thomas Graf wrote:
>> nlmsg_total_size() calculates the length of a netlink message
>> including header and alignment. nla_total_size() calculates the
>> space an individual attribute consumes which was meant to be used
>> in this context.
>> 
>> Also, ensure to account for the attribute header for the
>> IFLA_INFO_XSTATS attribute as implementations of get_xstats_size()
>> seem to assume that we do so.
>> 
>> The addition of two message headers minus the missing attribute
>> header resulted in a calculated message size that was larger than
>> required. Therefore we never risked running out of skb tailroom.
>> 
>> Signed-off-by: Thomas Graf <tgraf@...radead.org>
>> Cc: Patrick McHardy <kaber@...sh.net>
> 
> Looks good to me, thanks Thomas.
> 
> Acked-by: Patrick McHardy <kaber@...sh.net>

Applied, thanks.
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