linux-kernel - Re: kfree(0)

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Message-ID: <alpine.LFD.0.999.0708150442010.6482@enigma.security.iitk.ac.in>
Date:	Wed, 15 Aug 2007 04:43:02 +0530 (IST)
From:	Satyam Sharma <satyam@...radead.org>
To:	Tim Bird <tim.bird@...sony.com>
cc:	linux kernel <linux-kernel@...r.kernel.org>
Subject: Re: kfree(0) - ok?

On Tue, 14 Aug 2007, Tim Bird wrote:

> Hi all,
> 
> I have a quick question.
> 
> I'm trying to resurrect a patch from the Linux-tiny patch suite,
> to do accounting of kmalloc memory allocations.  In testing it
> with Linux 2.6.22, I've found a large number of kfrees of
> NULL pointers.
> 
> Is this considered OK?

kfree(NULL) is allowed -- for programmers' convenience.
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