linux-kernel - Re: [PATCH] iio: hid-sensors: Fix memory leak on failure path in hid_prox

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Date:	Thu, 07 May 2015 01:14:23 +0300
From:	Alexey Khoroshilov <khoroshilov@...ras.ru>
To:	Fabio Estevam <festevam@...il.com>
CC:	Jonathan Cameron <jic23@...nel.org>,
	Hartmut Knaack <knaack.h@....de>,
	Lars-Peter Clausen <lars@...afoo.de>,
	Peter Meerwald <pmeerw@...erw.net>, linux-iio@...r.kernel.org,
	linux-kernel <linux-kernel@...r.kernel.org>,
	ldv-project@...uxtesting.org
Subject: Re: [PATCH] iio: hid-sensors: Fix memory leak on failure path in
 hid_prox_probe()

On 07.05.2015 01:00, Fabio Estevam wrote:
> On Wed, May 6, 2015 at 6:48 PM, Alexey Khoroshilov
> <khoroshilov@...ras.ru> wrote:
>> If prox_parse_report() fails, memory allocated for channels is not
>> deallocated, since it is still in local variable channels
>> while kfree() is called with indio_dev->channels.
>>
>> Found by Linux Driver Verification project (linuxtesting.org).
>>
>> Signed-off-by: Alexey Khoroshilov <khoroshilov@...ras.ru>
>> ---
>>  drivers/iio/light/hid-sensor-prox.c | 3 ++-
>>  1 file changed, 2 insertions(+), 1 deletion(-)
>>
>> diff --git a/drivers/iio/light/hid-sensor-prox.c b/drivers/iio/light/hid-sensor-prox.c
>> index 91ecc46ffeaa..d0d188108a11 100644
>> --- a/drivers/iio/light/hid-sensor-prox.c
>> +++ b/drivers/iio/light/hid-sensor-prox.c
>> @@ -281,8 +281,9 @@ static int hid_prox_probe(struct platform_device *pdev)
>>         ret = prox_parse_report(pdev, hsdev, channels,
>>                                 HID_USAGE_SENSOR_PROX, prox_state);
>>         if (ret) {
>> +               kfree(channels);
>>                 dev_err(&pdev->dev, "failed to setup attributes\n");
>> -               goto error_free_dev_mem;
>> +               return ret;
> 
> Then the other calls to error_free_dev_mem will also miss to call
> 'kfree(channels)'.
> 

Not exactly. Other calls are after
  indio_dev->channels = channels;
So,
error_free_dev_mem:
	kfree(indio_dev->channels);
works for them well.

--
Alexey


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