linux-kernel - Re: [PATCH] rtl8187: fix use after free on failure path in rtl8187

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Message-ID: <53388D35.8080902@lwfinger.net>
Date:	Sun, 30 Mar 2014 16:31:33 -0500
From:	Larry Finger <Larry.Finger@...inger.net>
To:	Alexey Khoroshilov <khoroshilov@...ras.ru>,
	Herton Ronaldo Krzesinski <herton@...onical.com>,
	Hin-Tak Leung <htl10@...rs.sourceforge.net>
CC:	"John W. Linville" <linville@...driver.com>,
	linux-wireless@...r.kernel.org, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org, ldv-project@...uxtesting.org
Subject: Re: [PATCH] rtl8187: fix use after free on failure path in rtl8187_probe()

On 03/28/2014 03:26 PM, Alexey Khoroshilov wrote:
> If allocation of io_dmabuf fails, rtl8187_probe() calls usb_put_dev(udev)
> while usb_get_dev(udev) is not called yet. As a result refcnt is decremented
> incorrectly and usb_dev can be used after memory deallocation.
>
> Found by Linux Driver Verification project (linuxtesting.org).
>
> Signed-off-by: Alexey Khoroshilov <khoroshilov@...ras.ru>
> ---

Acked-by: Larry Finger <Larry.Finger@...inger.net>

Thanks,

Larry

>   drivers/net/wireless/rtl818x/rtl8187/dev.c | 4 ++--
>   1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/net/wireless/rtl818x/rtl8187/dev.c b/drivers/net/wireless/rtl818x/rtl8187/dev.c
> index fd78df813a85..d7f540a9dc9b 100644
> --- a/drivers/net/wireless/rtl818x/rtl8187/dev.c
> +++ b/drivers/net/wireless/rtl818x/rtl8187/dev.c
> @@ -1636,10 +1636,10 @@ static int rtl8187_probe(struct usb_interface *intf,
>
>    err_free_dmabuf:
>   	kfree(priv->io_dmabuf);
> - err_free_dev:
> -	ieee80211_free_hw(dev);
>   	usb_set_intfdata(intf, NULL);
>   	usb_put_dev(udev);
> + err_free_dev:
> +	ieee80211_free_hw(dev);
>   	return err;
>   }
>
>

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