linux-kernel - Re: [PATCH] netfilter: NF_HOOK

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Date:	Thu, 11 Nov 2010 21:49:26 +0100 (CET)
From:	Jan Engelhardt <jengelh@...ozas.de>
To:	Eric Paris <eparis@...hat.com>
cc:	netfilter-devel@...r.kernel.org, netfilter@...r.kernel.org,
	coreteam@...filter.org, kaber@...sh.net,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] netfilter: NF_HOOK_COND has wrong conditional

On Thursday 2010-11-11 20:09, Eric Paris wrote:

>The NF_HOOK_COND returns 0 when it shouldn't due to what I believe to be an
>error in the code as the order of operations is not what was intended.  C will
>evalutate == before =.  Which means ret is getting set to the bool result,
>rather than the return value of the function call.  The code says
>
>if (ret = function() == 1)
>when it meant to say:
>if ((ret = function()) == 1)

Thanks for catching. Indeed (ret = f) == 1 is desired, as can be seen in 
patch 2249065f4b22b493bae2caf549b86f175f33188e.
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