linux-kernel - Re: [PATCH] staging: rtl8712: Fix memory leak in r8712_init_recv

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Date:   Fri, 21 May 2021 14:18:13 +0200
From:   Greg KH <gregkh@...uxfoundation.org>
To:     Dongliang Mu <mudongliangabcd@...il.com>
Cc:     Larry.Finger@...inger.net, florian.c.schilhabel@...glemail.com,
        rkovhaev@...il.com, straube.linux@...il.com,
        linux-staging@...ts.linux.dev, linux-kernel@...r.kernel.org,
        syzbot+1c46f3771695bccbdb3a@...kaller.appspotmail.com
Subject: Re: [PATCH] staging: rtl8712: Fix memory leak in r8712_init_recv_priv

On Fri, May 21, 2021 at 08:08:11PM +0800, Dongliang Mu wrote:
> r871xu_dev_remove failed to call r8712_free_drv_sw() and free the
> resource (e.g., struct urb) due to the failure of firmware loading.
> 
> Fix this by invoking r8712_free_drv_sw at the failure site.
> 
> Reported-by: syzbot+1c46f3771695bccbdb3a@...kaller.appspotmail.com
> Fixes: b4383c971bc5 ("staging: rtl8712: handle firmware load failure")
> Signed-off-by: Dongliang Mu <mudongliangabcd@...il.com>
> ---
>  drivers/staging/rtl8712/usb_intf.c | 13 ++++++++++---
>  1 file changed, 10 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/staging/rtl8712/usb_intf.c b/drivers/staging/rtl8712/usb_intf.c
> index dc21e7743349..a5190b4250ce 100644
> --- a/drivers/staging/rtl8712/usb_intf.c
> +++ b/drivers/staging/rtl8712/usb_intf.c
> @@ -589,7 +589,7 @@ static int r871xu_drv_init(struct usb_interface *pusb_intf,
>   */
>  static void r871xu_dev_remove(struct usb_interface *pusb_intf)
>  {
> -	struct net_device *pnetdev = usb_get_intfdata(pusb_intf);
> +	struct net_device *pnetdev, *newpnetdev = usb_get_intfdata(pusb_intf);
>  	struct usb_device *udev = interface_to_usbdev(pusb_intf);
>  
>  	if (pnetdev) {

Did you test this?

I think you just broke the code right here :(

thanks,

greg k-h