linux-kernel - Re: [PATCH v2 2/2] usb: typec: qcom-pmic-typec: fix missing fwnode removal in error path

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Message-ID: <ZxZQw2DuKpPrBuGL@kuha.fi.intel.com>
Date: Mon, 21 Oct 2024 16:01:55 +0300
From: Heikki Krogerus <heikki.krogerus@...ux.intel.com>
To: Javier Carrasco <javier.carrasco.cruz@...il.com>
Cc: Bryan O'Donoghue <bryan.odonoghue@...aro.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
	Caleb Connolly <caleb.connolly@...aro.org>,
	Guenter Roeck <linux@...ck-us.net>, linux-arm-msm@...r.kernel.org,
	linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
	stable@...r.kernel.org
Subject: Re: [PATCH v2 2/2] usb: typec: qcom-pmic-typec: fix missing fwnode
 removal in error path

On Sun, Oct 20, 2024 at 02:56:35PM +0200, Javier Carrasco wrote:
> If drm_dp_hpd_bridge_register() fails, the probe function returns
> without removing the fwnode via fwnode_handle_put(), leaking the
> resource.
> 
> Jump to fwnode_remove if drm_dp_hpd_bridge_register() fails to remove
> the fwnode acquired with device_get_named_child_node().
> 
> Cc: stable@...r.kernel.org
> Fixes: 7d9f1b72b296 ("usb: typec: qcom-pmic-typec: switch to DRM_AUX_HPD_BRIDGE")
> Signed-off-by: Javier Carrasco <javier.carrasco.cruz@...il.com>

Reviewed-by: Heikki Krogerus <heikki.krogerus@...ux.intel.com>

> ---
>  drivers/usb/typec/tcpm/qcom/qcom_pmic_typec.c | 6 ++++--
>  1 file changed, 4 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/usb/typec/tcpm/qcom/qcom_pmic_typec.c b/drivers/usb/typec/tcpm/qcom/qcom_pmic_typec.c
> index 73a159e67ec2..3766790c1548 100644
> --- a/drivers/usb/typec/tcpm/qcom/qcom_pmic_typec.c
> +++ b/drivers/usb/typec/tcpm/qcom/qcom_pmic_typec.c
> @@ -93,8 +93,10 @@ static int qcom_pmic_typec_probe(struct platform_device *pdev)
>  		return -EINVAL;
>  
>  	bridge_dev = devm_drm_dp_hpd_bridge_alloc(tcpm->dev, to_of_node(tcpm->tcpc.fwnode));
> -	if (IS_ERR(bridge_dev))
> -		return PTR_ERR(bridge_dev);
> +	if (IS_ERR(bridge_dev)) {
> +		ret = PTR_ERR(bridge_dev);
> +		goto fwnode_remove;
> +	}
>  
>  	tcpm->tcpm_port = tcpm_register_port(tcpm->dev, &tcpm->tcpc);
>  	if (IS_ERR(tcpm->tcpm_port)) {
> 
> -- 
> 2.43.0

-- 
heikki