Re: [PATCH] wifi: rtw88: usb: kill and free rx urbs on probe failure

[Larry Finger]

On 8/23/23 02:50, Sascha Hauer wrote:
> After rtw_usb_alloc_rx_bufs() has been called rx urbs have been
> allocated and must be freed in the error path. After rtw_usb_init_rx()
> has been called they are submitted, so they also must be killed.
>
> Add these forgotten steps to the probe error path.
>
> Besides the lost memory this also fixes a problem when the driver
> fails to download the firmware in rtw_chip_info_setup(). In this
> case it can happen that the completion of the rx urbs handler runs
> at a time when we already freed our data structures resulting in
> a kernel crash.
>
> fixes: a82dfd33d1237 ("wifi: rtw88: Add common USB chip support")
> Cc: stable@xxxxxxxxxxxxxxx
> Reported-by: Ilgaz Öcal <ilgaz@xxxxxxxxxxxx>
> Signed-off-by: Sascha Hauer <s.hauer@xxxxxxxxxxxxxx>
> ---
>   drivers/net/wireless/realtek/rtw88/usb.c | 5 ++++-
>   1 file changed, 4 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/net/wireless/realtek/rtw88/usb.c b/drivers/net/wireless/realtek/rtw88/usb.c
> index 4a57efdba97bb..875a61c9c80d4 100644
> --- a/drivers/net/wireless/realtek/rtw88/usb.c
> +++ b/drivers/net/wireless/realtek/rtw88/usb.c
> @@ -844,7 +844,7 @@ int rtw_usb_probe(struct usb_interface *intf, const struct usb_device_id *id)
>   
>   	ret = rtw_core_init(rtwdev);
>   	if (ret)
> -		goto err_release_hw;
> +		goto err_free_rx_bufs;
>   
>   	ret = rtw_usb_intf_init(rtwdev, intf);
>   	if (ret) {
> @@ -890,6 +890,9 @@ int rtw_usb_probe(struct usb_interface *intf, const struct usb_device_id *id)
>   err_deinit_core:
>   	rtw_core_deinit(rtwdev);
>   
> +err_free_rx_bufs:
> +	rtw_usb_free_rx_bufs(rtwusb);
> +
>   err_release_hw:
>   	ieee80211_free_hw(hw);
>   

Acked-by: Larry Finger <Larry.Finger@xxxxxxxxxxxx>

Thanks Sasha,

Larry