linux-kernel - Re: [PATCH] regulator: Avoid potential NULL dereference in reg_fixed_voltage

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Message-ID: <CAF+7xWk8f-qiodctY3U3FRJiohZzYNO4KaE7v5qi1C52HUySNg@mail.gmail.com>
Date:	Sun, 27 Nov 2011 19:56:20 +0800
From:	Axel Lin <axel.lin@...il.com>
To:	Mark Brown <broonie@...nsource.wolfsonmicro.com>
Cc:	linux-kernel@...r.kernel.org, Rajendra Nayak <rnayak@...com>,
	Liam Girdwood <lrg@...com>
Subject: Re: [PATCH] regulator: Avoid potential NULL dereference in reg_fixed_voltage_probe()

2011/11/27 Mark Brown <broonie@...nsource.wolfsonmicro.com>:
> On Sun, Nov 27, 2011 at 10:13:50AM +0800, Axel Lin wrote:
>
>> -     if (pdev->dev.of_node)
>> +     if (pdev->dev.of_node) {
>>               config = of_get_fixed_voltage_config(&pdev->dev);
>> +             if (!config)
>> +                     return -ENOMEM;
>> +     }
>
> Looking at this I'm thinking it's better to just drop the check for
> of_node entirely and just let of_get_fixed_voltage_config() fail to find
> what it needs.
>
In the case of pdev->dev.of_node == NULL, config points to
pdev->dev.platform_data.

Or do you prefer change it this way:

--- a/drivers/regulator/fixed.c
+++ b/drivers/regulator/fixed.c
@@ -163,12 +163,17 @@ static struct regulator_ops fixed_voltage_ops = {

 static int __devinit reg_fixed_voltage_probe(struct platform_device *pdev)
 {
-       struct fixed_voltage_config *config = pdev->dev.platform_data;
+       struct fixed_voltage_config *config;
        struct fixed_voltage_data *drvdata;
        int ret;

        if (pdev->dev.of_node)
                config = of_get_fixed_voltage_config(&pdev->dev);
+       else
+               config = pdev->dev.platform_data;
+
+       if (!config)
+               return -ENOMEM;

        drvdata = kzalloc(sizeof(struct fixed_voltage_data), GFP_KERNEL);
        if (drvdata == NULL) {
--
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