linux-kernel - Re: [PATCH 1/4] regulator/wm831x-dcdc: fix potential NULL dereference

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Message-Id: <1DE04AB3-1B9A-4962-8A13-AFC74A898D80@opensource.wolfsonmicro.com>
Date:	Fri, 20 Aug 2010 10:03:32 +0100
From:	Mark Brown <broonie@...nsource.wolfsonmicro.com>
To:	Axel Lin <axel.lin@...il.com>
Cc:	linux-kernel <linux-kernel@...r.kernel.org>,
	Liam Girdwood <lrg@...mlogic.co.uk>
Subject: Re: [PATCH 1/4] regulator/wm831x-dcdc: fix potential NULL dereference

On 20 Aug 2010, at 02:58, Axel Lin <axel.lin@...il.com> wrote:

> pdata is dereferenced earlier than tested for being NULL.
> Thus move the dereference of "pdata" below the check for NULL.
> 
> Signed-off-by: Axel Lin <axel.lin@...il.com>
> ---
> drivers/regulator/wm831x-dcdc.c |   36 ++++++++++++++++++++++++------------
> 1 files changed, 24 insertions(+), 12 deletions(-)
> 
> diff --git a/drivers/regulator/wm831x-dcdc.c b/drivers/regulator/wm831x-dcdc.c
> index dbfaf59..ed66fac 100644
> --- a/drivers/regulator/wm831x-dcdc.c
> +++ b/drivers/regulator/wm831x-dcdc.c
> @@ -501,14 +501,17 @@ static __devinit int wm831x_buckv_probe(struct platform_device *pdev)
> {
>  	struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
>  	struct wm831x_pdata *pdata = wm831x->dev->platform_data;
> -	int id = pdev->id % ARRAY_SIZE(pdata->dcdc);

ARRAY_SIZE() isn't actually a dereference, it's evaluated at compile time.--
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