linux-kernel - Re: [PATCH 1/2] usb: typec: qcom-pmic: fix use-after-free on late probe errors

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Date: Mon, 22 Apr 2024 14:13:54 +0300
From: Heikki Krogerus <heikki.krogerus@...ux.intel.com>
To: Johan Hovold <johan+linaro@...nel.org>
Cc: Bryan O'Donoghue <bryan.odonoghue@...aro.org>,
	Bjorn Andersson <andersson@...nel.org>,
	Konrad Dybcio <konrad.dybcio@...aro.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
	linux-arm-msm@...r.kernel.org, linux-usb@...r.kernel.org,
	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Subject: Re: [PATCH 1/2] usb: typec: qcom-pmic: fix use-after-free on late
 probe errors

On Thu, Apr 18, 2024 at 04:57:29PM +0200, Johan Hovold wrote:
> Make sure to stop and deregister the port in case of late probe errors
> to avoid use-after-free issues when the underlying memory is released by
> devres.
> 
> Fixes: a4422ff22142 ("usb: typec: qcom: Add Qualcomm PMIC Type-C driver")
> Cc: stable@...r.kernel.org	# 6.5
> Cc: Bryan O'Donoghue <bryan.odonoghue@...aro.org>
> Signed-off-by: Johan Hovold <johan+linaro@...nel.org>

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

> ---
>  drivers/usb/typec/tcpm/qcom/qcom_pmic_typec.c | 8 ++++++--
>  1 file changed, 6 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 e48412cdcb0f..d3958c061a97 100644
> --- a/drivers/usb/typec/tcpm/qcom/qcom_pmic_typec.c
> +++ b/drivers/usb/typec/tcpm/qcom/qcom_pmic_typec.c
> @@ -104,14 +104,18 @@ static int qcom_pmic_typec_probe(struct platform_device *pdev)
>  
>  	ret = tcpm->port_start(tcpm, tcpm->tcpm_port);
>  	if (ret)
> -		goto fwnode_remove;
> +		goto port_unregister;
>  
>  	ret = tcpm->pdphy_start(tcpm, tcpm->tcpm_port);
>  	if (ret)
> -		goto fwnode_remove;
> +		goto port_stop;
>  
>  	return 0;
>  
> +port_stop:
> +	tcpm->port_stop(tcpm);
> +port_unregister:
> +	tcpm_unregister_port(tcpm->tcpm_port);
>  fwnode_remove:
>  	fwnode_remove_software_node(tcpm->tcpc.fwnode);
>  
> -- 
> 2.43.2

-- 
heikki