netdev - Re: [PATCH] netfilter: guard the size of the nf_ct

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Message-ID: <4CE1150D.1080302@trash.net>
Date:	Mon, 15 Nov 2010 12:10:05 +0100
From:	Patrick McHardy <kaber@...sh.net>
To:	Changli Gao <xiaosuo@...il.com>
CC:	"David S. Miller" <davem@...emloft.net>,
	netfilter-devel@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: [PATCH] netfilter: guard the size of the nf_ct_ext

On 15.11.2010 07:15, Changli Gao wrote:
> We'd better guard the size of the nf_ct_ext, as the nf_ct_ext.len is u8.
> If the size is bigger than 255, a warning will be printed.

Why are you checking this in basically every possible spot?
Just checking once during registration (assuming the worst
case of a conntrack using every possible extension) should
be enough.
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