linux-kernel - Re: [PATCH v3] ARM: imx: fix error handling in ipu device registration

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Message-ID: <20140517225339.GJ16255@mwanda>
Date:	Sun, 18 May 2014 01:53:39 +0300
From:	Dan Carpenter <dan.carpenter@...cle.com>
To:	Russell King - ARM Linux <linux@....linux.org.uk>
Cc:	Uwe Kleine-König 
	<u.kleine-koenig@...gutronix.de>, Emil Goode <emilgoode@...il.com>,
	Shawn Guo <shawn.guo@...escale.com>,
	Sascha Hauer <kernel@...gutronix.de>,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	kernel-janitors@...r.kernel.org
Subject: Re: [PATCH v3] ARM: imx: fix error handling in ipu device
 registration

On Sat, May 17, 2014 at 11:35:55PM +0100, Russell King - ARM Linux wrote:
> On Sun, May 18, 2014 at 01:08:36AM +0300, Dan Carpenter wrote:
> > Let's look at that error handling again.
> > 
> > err:  <-- the name is not descriptive.  the location is bad.
> > 		kfree(pdev->dev.dma_mask);  <- null dereference.
> > 		platform_device_put(pdev);  <- ok
> > 		return ERR_PTR(-ENODEV);    <- should be "return ERR_PTR(ret);"
> > 
> > 3 out of 4 of the lines are bad.
> 
> 2 out of 4.  kfree(NULL) is perfectly legal.

pdev was NULL though...

The bug is *caused* by trying to use the same "err" label to do all
error handling.  This is a very common anti-patern, but if you follow
canonical kernel style then your error handling is less buggy.

regards,
dan carpenter

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