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

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Date:   Fri, 21 May 2021 20:09:06 +0800
From:   慕冬亮 <mudongliangabcd@...il.com>
To:     Larry.Finger@...inger.net, florian.c.schilhabel@...glemail.com,
        Greg KH <gregkh@...uxfoundation.org>, rkovhaev@...il.com,
        straube.linux@...il.com, linux-staging@...ts.linux.dev,
        linux-kernel <linux-kernel@...r.kernel.org>
Cc:     syzbot+1c46f3771695bccbdb3a@...kaller.appspotmail.com
Subject: Re: [PATCH] staging: rtl8712: Fix memory leak in r8712_init_recv_priv

On Fri, May 21, 2021 at 8:08 PM Dongliang Mu <mudongliangabcd@...il.com> 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) {
> @@ -597,9 +597,9 @@ static void r871xu_dev_remove(struct usb_interface *pusb_intf)
>
>                 /* never exit with a firmware callback pending */
>                 wait_for_completion(&padapter->rtl8712_fw_ready);
> -               pnetdev = usb_get_intfdata(pusb_intf);
> +               newpnetdev = usb_get_intfdata(pusb_intf);
>                 usb_set_intfdata(pusb_intf, NULL);
> -               if (!pnetdev)
> +               if (!newpnetdev)
>                         goto firmware_load_fail;
>                 release_firmware(padapter->fw);
>                 if (drvpriv.drv_registered)
> @@ -625,6 +625,13 @@ static void r871xu_dev_remove(struct usb_interface *pusb_intf)
>          */
>         if (udev->state != USB_STATE_NOTATTACHED)
>                 usb_reset_device(udev);
> +       if (pnetdev) {
> +               struct _adapter *padapter = netdev_priv(pnetdev);
> +               /* Stop driver mlme relation timer */
> +               //r8712_stop_drv_timers(padapter);
> +               //r871x_dev_unload(padapter);

I am not sure if I should add those deallocation functions in this
branch. I will appreciate it if anyone can give some advice here.

> +               r8712_free_drv_sw(padapter);
> +       }
>  }
>
>  static int __init r8712u_drv_entry(void)
> --
> 2.25.1
>