linux-kernel - Re: [PATCH 8/8] sound/soc: introduce missing kfree

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Date:	Sat, 12 Sep 2009 13:58:58 +0200 (CEST)
From:	Julia Lawall <julia@...u.dk>
To:	Mark Brown <broonie@...nsource.wolfsonmicro.com>
Cc:	Takashi Iwai <tiwai@...e.de>, Jaroslav Kysela <perex@...ex.cz>,
	Liam Girdwood <lrg@...mlogic.co.uk>,
	alsa-devel@...a-project.org, linux-kernel@...r.kernel.org,
	kernel-janitors@...r.kernel.org
Subject: Re: [PATCH 8/8] sound/soc: introduce missing kfree

On Sat, 12 Sep 2009, Mark Brown wrote:

> On Fri, Sep 11, 2009 at 06:23:04PM +0200, Julia Lawall wrote:
> > From: Julia Lawall <julia@...u.dk>
> 
> > Error handling code following a kzalloc should free the allocated data.
> > Error handling code following an ioremap should iounmap the allocated data.
> 
> This doesn't seem to be a complete fix for the issue.  There are several
> other places where the function can fail but which don't do this cleanup
> - this may indicate a problem with the automatic analysis if it fails to
> spot the problem in the fixed code?
> 
> In general for this sort of issue I'd suggest considering adding the
> error handling using the goto unwind block style since that tends to be
> a bit more robust against forgotten error handling than adding unwind
> code at each error site.  It's also a bit more managable when the code
> is doing a series of allocations like this is.

OK, thanks for the suggestions.  I see that there is a return near the 
end:

	if (rc) {
		free_irq(psc_dma->irq, psc_dma);
		free_irq(psc_dma->capture.irq,
			 &psc_dma->capture);
		free_irq(psc_dma->playback.irq,
			 &psc_dma->playback);
		return -ENODEV;
	}

that I missed.  I will send a new patch, using the suggested goto style.

julia
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