linux-kernel - [PATCH 5.15 109/135] iio: adc: rzg2l_adc: add missing fwnode_handle_put() in rzg2l_adc_parse

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Message-Id: <20220627111941.317789700@linuxfoundation.org>
Date:   Mon, 27 Jun 2022 13:21:56 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Hulk Robot <hulkci@...wei.com>,
        Jialin Zhang <zhangjialin11@...wei.com>,
        Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        Stable@...r.kernel.org,
        Jonathan Cameron <Jonathan.Cameron@...wei.com>
Subject: [PATCH 5.15 109/135] iio: adc: rzg2l_adc: add missing fwnode_handle_put() in rzg2l_adc_parse_properties()

From: Jialin Zhang <zhangjialin11@...wei.com>

commit d836715f588ea15f905f607c27bc693587058db4 upstream.

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>
Reviewed-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
Reviewed-by: Geert Uytterhoeven <geert+renesas@...der.be>
Link: https://lore.kernel.org/r/20220517033526.2035735-1-zhangjialin11@huawei.com
Cc: <Stable@...r.kernel.org>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@...wei.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/iio/adc/rzg2l_adc.c |    8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

--- a/drivers/iio/adc/rzg2l_adc.c
+++ b/drivers/iio/adc/rzg2l_adc.c
@@ -334,11 +334,15 @@ static int rzg2l_adc_parse_properties(st
 	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;