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@huawei.com>
Signed-off-by: Jialin Zhang <zhangjialin11@huawei.com>
Reviewed-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Link: https://lore.kernel.org/r/20220517033526.2035735-1-zhangjialin11@huawei.com
Cc: <Stable@vger.kernel.org>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

diff --git a/drivers/iio/adc/rzg2l_adc.c b/drivers/iio/adc/rzg2l_adc.c
index 7585144..5b09a93 100644 (file)
--- 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;