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

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Message-ID: <AANLkTik-rkJjSD_cH15m6vfvrM_BAd_DfN+Nv5BRK5u3@mail.gmail.com>
Date:	Fri, 20 Aug 2010 23:43:53 +0800
From:	Axel Lin <axel.lin@...il.com>
To:	Mark Brown <broonie@...nsource.wolfsonmicro.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

2010/8/20 Mark Brown <broonie@...nsource.wolfsonmicro.com>:
> 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.
Ah. You are right! Thanks.
Axel
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