linux-kernel - Re: [PATCH] carl9170: fix leaks at failure path in carl9170_usb

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Message-ID: <52466624.4040106@ispras.ru>
Date:	Sat, 28 Sep 2013 01:16:20 -0400
From:	Alexey Khoroshilov <khoroshilov@...ras.ru>
To:	Fabio Estevam <festevam@...il.com>
CC:	Christian Lamparter <chunkeey@...glemail.com>,
	"John W. Linville" <linville@...driver.com>,
	linux-wireless@...r.kernel.org,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	ldv-project@...uxtesting.org
Subject: Re: [PATCH] carl9170: fix leaks at failure path in carl9170_usb_probe()

On 28.09.2013 00:17, Fabio Estevam wrote:
> On Sat, Sep 28, 2013 at 12:51 AM, Alexey Khoroshilov
> <khoroshilov@...ras.ru> wrote:
>
>> -       return request_firmware_nowait(THIS_MODULE, 1, CARL9170FW_NAME,
>> +       err = request_firmware_nowait(THIS_MODULE, 1, CARL9170FW_NAME,
>>                  &ar->udev->dev, GFP_KERNEL, ar, carl9170_usb_firmware_step2);
>> +       if (err) {
>> +               usb_put_dev(udev);
>> +               usb_put_dev(udev);
> You are doing the same free twice.
Yes, because it was get twice.
> I guess you meant to also free: usb_put_dev(ar->udev)
udev and ar->udev are equal, so technically the patch is correct.

I agree that there is some inconsistency, but I would prefer to fix it 
at usb_get_dev() side with a comment about reasons for the double get.

--
Alexey

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