linux-kernel - [PATCH v3] soc: qcom: pmic: Fix resource leaks in a device_for_each_child

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Message-Id: <20230612133452.47315-1-luhongfei@vivo.com>
Date:   Mon, 12 Jun 2023 21:34:52 +0800
From:   Lu Hongfei <luhongfei@...o.com>
To:     Andy Gross <agross@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konrad.dybcio@...aro.org>,
        linux-arm-msm@...r.kernel.org (open list:ARM/QUALCOMM SUPPORT),
        linux-kernel@...r.kernel.org (open list)
Cc:     opensource.kernel@...o.com, luhongfei@...o.com
Subject: [PATCH v3] soc: qcom: pmic: Fix resource leaks in a device_for_each_child_node() loop

The device_for_each_child_node loop should call fwnode_handle_put()
before return in some error cases, which could avoid resource leaks.

Let's fix this bug in pmic_glink_altmode_probe.

Signed-off-by: Lu Hongfei <luhongfei@...o.com>
---
The modifications made compared to the previous version are as follows:
1. Modified the patch title
2. Modified the commit message to make it easier to understand
   patch's modifications.

 drivers/soc/qcom/pmic_glink_altmode.c | 27 ++++++++++++++++++---------
 1 file changed, 18 insertions(+), 9 deletions(-)

diff --git a/drivers/soc/qcom/pmic_glink_altmode.c b/drivers/soc/qcom/pmic_glink_altmode.c
index df48fbea4b68..a7fc6570fa1e 100644
--- a/drivers/soc/qcom/pmic_glink_altmode.c
+++ b/drivers/soc/qcom/pmic_glink_altmode.c
@@ -395,7 +395,7 @@ static int pmic_glink_altmode_probe(struct auxiliary_device *adev,
 		ret = fwnode_property_read_u32(fwnode, "reg", &port);
 		if (ret < 0) {
 			dev_err(dev, "missing reg property of %pOFn\n", fwnode);
-			return ret;
+			goto err_node_put;
 		}
 
 		if (port >= ARRAY_SIZE(altmode->ports)) {
@@ -405,7 +405,8 @@ static int pmic_glink_altmode_probe(struct auxiliary_device *adev,
 
 		if (altmode->ports[port].altmode) {
 			dev_err(dev, "multiple connector definition for port %u\n", port);
-			return -EINVAL;
+			ret = -EINVAL;
+			goto err_node_put;
 		}
 
 		alt_port = &altmode->ports[port];
@@ -420,33 +421,37 @@ static int pmic_glink_altmode_probe(struct auxiliary_device *adev,
 
 		ret = devm_drm_bridge_add(dev, &alt_port->bridge);
 		if (ret)
-			return ret;
+			goto err_node_put;
 
 		alt_port->dp_alt.svid = USB_TYPEC_DP_SID;
 		alt_port->dp_alt.mode = USB_TYPEC_DP_MODE;
 		alt_port->dp_alt.active = 1;
 
 		alt_port->typec_mux = fwnode_typec_mux_get(fwnode);
-		if (IS_ERR(alt_port->typec_mux))
-			return dev_err_probe(dev, PTR_ERR(alt_port->typec_mux),
+		if (IS_ERR(alt_port->typec_mux)) {
+			ret = dev_err_probe(dev, PTR_ERR(alt_port->typec_mux),
 					     "failed to acquire mode-switch for port: %d\n",
 					     port);
+			goto err_node_put;
+		}
 
 		ret = devm_add_action_or_reset(dev, pmic_glink_altmode_put_mux,
 					       alt_port->typec_mux);
 		if (ret)
-			return ret;
+			goto err_node_put;
 
 		alt_port->typec_switch = fwnode_typec_switch_get(fwnode);
-		if (IS_ERR(alt_port->typec_switch))
-			return dev_err_probe(dev, PTR_ERR(alt_port->typec_switch),
+		if (IS_ERR(alt_port->typec_switch)) {
+			ret = dev_err_probe(dev, PTR_ERR(alt_port->typec_switch),
 					     "failed to acquire orientation-switch for port: %d\n",
 					     port);
+			goto err_node_put;
+		}
 
 		ret = devm_add_action_or_reset(dev, pmic_glink_altmode_put_switch,
 					       alt_port->typec_switch);
 		if (ret)
-			return ret;
+			goto err_node_put;
 	}
 
 	altmode->client = devm_pmic_glink_register_client(dev,
@@ -455,6 +460,10 @@ static int pmic_glink_altmode_probe(struct auxiliary_device *adev,
 							  pmic_glink_altmode_pdr_notify,
 							  altmode);
 	return PTR_ERR_OR_ZERO(altmode->client);
+
+err_node_put:
+	fwnode_handle_put(fwnode);
+	return ret;
 }
 
 static const struct auxiliary_device_id pmic_glink_altmode_id_table[] = {
-- 
2.39.0