linux-kernel - Re: [PATCH] thermal: ti-soc-thermal: ti-bandgap.c: Cleaning up memory leak

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Date:	Mon, 2 Jun 2014 23:13:36 +0200
From:	Rickard Strandqvist <rickard_strandqvist@...ctrumdigital.se>
To:	Eduardo Valentin <edubezval@...il.com>
Cc:	Eduardo Valentin <eduardo.valentin@...com>,
	Zhang Rui <rui.zhang@...el.com>,
	Grant Likely <grant.likely@...aro.org>,
	Rob Herring <robh+dt@...nel.org>, linux-pm@...r.kernel.org,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>
Subject: Re: [PATCH] thermal: ti-soc-thermal: ti-bandgap.c: Cleaning up memory leak

Hi

Okay, then I make a new patch with only the if() part of the code.


Best regards
Rickard Strandqvist


2014-06-02 19:08 GMT+02:00 Eduardo Valentin <edubezval@...il.com>:
> On Sun, Jun 01, 2014 at 01:33:51PM +0200, Rickard Strandqvist wrote:
>> There is a risk for memory leak in when something unexpected happens
>> and the function returns.
>
> I don't think there is a risk of memory leak, but wrong address access,
> in this case.
>
>>
>> This was largely found by using a static code analysis program called cppcheck.
>>
>> Signed-off-by: Rickard Strandqvist <rickard_strandqvist@...ctrumdigital.se>
>> ---
>>  drivers/thermal/ti-soc-thermal/ti-bandgap.c |    3 ++-
>>  1 file changed, 2 insertions(+), 1 deletion(-)
>>
>> diff --git a/drivers/thermal/ti-soc-thermal/ti-bandgap.c b/drivers/thermal/ti-soc-thermal/ti-bandgap.c
>> index 3ab12ee..8401d2e 100644
>> --- a/drivers/thermal/ti-soc-thermal/ti-bandgap.c
>> +++ b/drivers/thermal/ti-soc-thermal/ti-bandgap.c
>> @@ -1155,8 +1155,9 @@ static struct ti_bandgap *ti_bandgap_build(struct platform_device *pdev)
>>       /* register shadow for context save and restore */
>>       bgp->regval = devm_kzalloc(&pdev->dev, sizeof(*bgp->regval) *
>>                                  bgp->conf->sensor_count, GFP_KERNEL);
>> -     if (!bgp) {
>> +     if (!bgp->regval) {
>
> I agree with this fix.
>
>>               dev_err(&pdev->dev, "Unable to allocate mem for driver ref\n");
>> +             devm_kfree(&pdev->dev, bgp);
>
> But I think this is unnecessary, as it has been managed allocated.
>
> Cheers,
>
> Eduardo
>
>>               return ERR_PTR(-ENOMEM);
>>       }
>>
>> --
>> 1.7.10.4
>>
>> --
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