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

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Date:   Wed, 23 Aug 2023 10:54:30 -0500
From:   Larry Finger <Larry.Finger@...inger.net>
To:     Sascha Hauer <s.hauer@...gutronix.de>,
        linux-wireless@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, Ping-Ke Shih <pkshih@...ltek.com>,
        Kalle Valo <kvalo@...nel.org>,
        Ilgaz Öcal <ilgaz@...az.gen.tr>,
        kernel@...gutronix.de
Subject: Re: [PATCH] wifi: rtw88: usb: kill and free rx urbs on probe failure

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@...r.kernel.org
> Reported-by: Ilgaz Öcal <ilgaz@...az.gen.tr>
> Signed-off-by: Sascha Hauer <s.hauer@...gutronix.de>
> ---
>   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@...inger.net>

Thanks Sasha,

Larry