linux-kernel - Re: [PATCH 1/7] USB: core: fix device node leak

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Message-ID: <20170605033530.GA20014@b29397-desktop>
Date:   Mon, 5 Jun 2017 11:35:30 +0800
From:   Peter Chen <hzpeterchen@...il.com>
To:     Johan Hovold <johan@...nel.org>
CC:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Linus Walleij <linus.walleij@...aro.org>,
        Peter Chen <peter.chen@...escale.com>,
        Rob Herring <robh@...nel.org>, Arnd Bergmann <arnd@...db.de>,
        Sricharan R <sricharan@...eaurora.org>,
        Zhang Rui <rui.zhang@...el.com>,
        Eduardo Valentin <edubezval@...il.com>,
        <linux-pm@...r.kernel.org>, <linux-usb@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, stable <stable@...r.kernel.org>,
        Peter Chen <peter.chen@....com>
Subject: Re: [PATCH 1/7] USB: core: fix device node leak

On Tue, May 30, 2017 at 06:25:48PM +0200, Johan Hovold wrote:
> Make sure to release any OF device-node reference taken when creating
> the USB device.
> 
> Note that we currently do not hold a reference to the root hub
> device-tree node (i.e. the parent controller node).
> 
> Fixes: 69bec7259853 ("USB: core: let USB device know device node")
> Cc: stable <stable@...r.kernel.org>	# v4.6
> Cc: Peter Chen <peter.chen@....com>
> Signed-off-by: Johan Hovold <johan@...nel.org>
> ---
>  drivers/usb/core/usb.c | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/drivers/usb/core/usb.c b/drivers/usb/core/usb.c
> index 28b053cacc90..62e1906bb2f3 100644
> --- a/drivers/usb/core/usb.c
> +++ b/drivers/usb/core/usb.c
> @@ -416,6 +416,8 @@ static void usb_release_dev(struct device *dev)
>  
>  	usb_destroy_configuration(udev);
>  	usb_release_bos_descriptor(udev);
> +	if (udev->parent)
> +		of_node_put(dev->of_node);
>  	usb_put_hcd(hcd);
>  	kfree(udev->product);
>  	kfree(udev->manufacturer);

Acked-by: Peter Chen <peter.chen@....com>

-- 

Best Regards,
Peter Chen