linux-kernel - Re: [PATCH] p54usb: fix leaks at failure path in p54u

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Message-ID: <CABPxzYLzMvtWShP_PFdyTzV8P1P177yPZh=xAO=3tiy97UfEmQ@mail.gmail.com>
Date:	Sun, 9 Mar 2014 04:14:32 +0530
From:	Krishna Chaitanya <chaitanya.mgit@...il.com>
To:	Alexey Khoroshilov <khoroshilov@...ras.ru>
Cc:	Christian Lamparter <chunkeey@...glemail.com>,
	"John W. Linville" <linville@...driver.com>,
	linux-wireless <linux-wireless@...r.kernel.org>,
	netdev <netdev@...r.kernel.org>, linux-kernel@...r.kernel.org,
	ldv-project@...uxtesting.org
Subject: Re: [PATCH] p54usb: fix leaks at failure path in p54u_probe()

On Sat, Mar 8, 2014 at 2:41 AM, Alexey Khoroshilov
<khoroshilov@...ras.ru> wrote:
> If p54u_load_firmware() fails, p54u_probe() does not deallocate
> already allocated resources. The patch adds proper failure handling.
>
> Found by Linux Driver Verification project (linuxtesting.org).
>
> Signed-off-by: Alexey Khoroshilov <khoroshilov@...ras.ru>
> ---
>  drivers/net/wireless/p54/p54usb.c | 4 ++++
>  1 file changed, 4 insertions(+)
>
> diff --git a/drivers/net/wireless/p54/p54usb.c b/drivers/net/wireless/p54/p54usb.c
> index 6e635cfa24c8..5df74503fd4f 100644
> --- a/drivers/net/wireless/p54/p54usb.c
> +++ b/drivers/net/wireless/p54/p54usb.c
> @@ -1053,6 +1053,10 @@ static int p54u_probe(struct usb_interface *intf,
>                 priv->upload_fw = p54u_upload_firmware_net2280;
>         }
>         err = p54u_load_firmware(dev, intf);
> +       if (err) {
> +               usb_put_dev(udev);
> +               p54_free_common(dev);
> +       }
>         return err;
>  }
The load_firmware puts down the reference
in case of error. Only free is required here.
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