linux-kernel - Re: [PATCH] NET: catch signed nla_len() retval in tcf_simp

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Message-Id: <1208437113.4420.34.camel@localhost>
Date:	Thu, 17 Apr 2008 08:58:33 -0400
From:	jamal <hadi@...erus.ca>
To:	Patrick McHardy <kaber@...sh.net>
Cc:	David Miller <davem@...emloft.net>, 12o3l@...cali.nl,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] NET: catch signed nla_len() retval in tcf_simp_init()

On Thu, 2008-17-04 at 06:55 +0200, Patrick McHardy wrote:

> The change is also unnecessary because the attribute was
> already validated and the length can not be less than zero.

Since act_simple is an academic example:
I think that a better solution is to add TCA_DEF_DATA (which is a
string) to the nla_policy. nla_policy is defined but at the moment it is
not used in the call to nla_parse_nested() - might as well use it.

Roel, would you like to take a crack at that? You will need to define
the max size of the string that TCA_DEF_DATA can hold (if you want to do
it cleanly then define it in include/linux/tc_act/tc_defact.h). This MAX
size will appear in the nla_policy.

cheers,
jamal

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