[PATCH 5.15 168/215] hwmon: (ltc2992) Fix memory leak in ltc2992_parse_dt()

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5.15-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Javier Carrasco <javier.carrasco.cruz@xxxxxxxxx>

commit a94ff8e50c20bde6d50864849a98b106e45d30c6 upstream.

A new error path was added to the fwnode_for_each_available_node() loop
in ltc2992_parse_dt(), which leads to an early return that requires a
call to fwnode_handle_put() to avoid a memory leak in that case.

Add the missing fwnode_handle_put() in the error path from a zero value
shunt resistor.

Cc: stable@xxxxxxxxxxxxxxx
Fixes: 10b029020487 ("hwmon: (ltc2992) Avoid division by zero")
Signed-off-by: Javier Carrasco <javier.carrasco.cruz@xxxxxxxxx>
Link: https://lore.kernel.org/r/20240523-fwnode_for_each_available_child_node_scoped-v2-1-701f3a03f2fb@xxxxxxxxx
Signed-off-by: Guenter Roeck <linux@xxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
 drivers/hwmon/ltc2992.c |    4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

--- a/drivers/hwmon/ltc2992.c
+++ b/drivers/hwmon/ltc2992.c
@@ -913,9 +913,11 @@ static int ltc2992_parse_dt(struct ltc29
 
 		ret = fwnode_property_read_u32(child, "shunt-resistor-micro-ohms", &val);
 		if (!ret) {
-			if (!val)
+			if (!val) {
+				fwnode_handle_put(child);
 				return dev_err_probe(&st->client->dev, -EINVAL,
 						     "shunt resistor value cannot be zero\n");
+			}
 			st->r_sense_uohm[addr] = val;
 		}
 	}






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