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

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Date: Thu, 18 Apr 2024 16:57:29 +0200
From: Johan Hovold <johan+linaro@...nel.org>
To: Bryan O'Donoghue <bryan.odonoghue@...aro.org>,
	Heikki Krogerus <heikki.krogerus@...ux.intel.com>
Cc: 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,
	Johan Hovold <johan+linaro@...nel.org>,
	stable@...r.kernel.org
Subject: [PATCH 1/2] usb: typec: qcom-pmic: fix use-after-free on late probe errors

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>
---
 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