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

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Date:	Thu, 10 Oct 2013 13:59:52 -0400
From:	"John W. Linville" <linville@...driver.com>
To:	Alexey Khoroshilov <khoroshilov@...ras.ru>
Cc:	Fabio Estevam <festevam@...il.com>,
	Christian Lamparter <chunkeey@...glemail.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 Sat, Sep 28, 2013 at 01:16:20AM -0400, Alexey Khoroshilov wrote:
> 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.

What is the reason for the double get?

-- 
John W. Linville		Someday the world will need a hero, and you
linville@...driver.com			might be all we have.  Be ready.
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