linux-kernel - [PATCH] iio: adc: rzg2l_adc: add missing fwnode_handle_put() in rzg2l_adc_parse

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Date:   Tue, 17 May 2022 11:35:26 +0800
From:   Jialin Zhang <zhangjialin11@...wei.com>
To:     <prabhakar.mahadev-lad.rj@...renesas.com>, <jic23@...nel.org>,
        <lars@...afoo.de>, <biju.das.jz@...renesas.com>
CC:     <linux-iio@...r.kernel.org>, <linux-renesas-soc@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>
Subject: [PATCH] iio: adc: rzg2l_adc: add missing fwnode_handle_put() in rzg2l_adc_parse_properties()

fwnode_handle_put() should be used when terminating
device_for_each_child_node() iteration with break or
return to prevent stale device node references from
being left behind.

Fixes: d484c21bacfa ("iio: adc: Add driver for Renesas RZ/G2L A/D converter")
Reported-by: Hulk Robot <hulkci@...wei.com>
Signed-off-by: Jialin Zhang <zhangjialin11@...wei.com>
---
 drivers/iio/adc/rzg2l_adc.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/drivers/iio/adc/rzg2l_adc.c b/drivers/iio/adc/rzg2l_adc.c
index 7585144b9715..5b09a93fdf34 100644
--- a/drivers/iio/adc/rzg2l_adc.c
+++ b/drivers/iio/adc/rzg2l_adc.c
@@ -334,11 +334,15 @@ static int rzg2l_adc_parse_properties(struct platform_device *pdev, struct rzg2l
 	i = 0;
 	device_for_each_child_node(&pdev->dev, fwnode) {
 		ret = fwnode_property_read_u32(fwnode, "reg", &channel);
-		if (ret)
+		if (ret) {
+			fwnode_handle_put(fwnode);
 			return ret;
+		}
 
-		if (channel >= RZG2L_ADC_MAX_CHANNELS)
+		if (channel >= RZG2L_ADC_MAX_CHANNELS) {
+			fwnode_handle_put(fwnode);
 			return -EINVAL;
+		}
 
 		chan_array[i].type = IIO_VOLTAGE;
 		chan_array[i].indexed = 1;
-- 
2.25.1