thermal: of: Fix OF node leak in of_thermal_zone_find() error paths

commit c0a1ef9 upstream.

Terminating for_each_available_child_of_node() loop requires dropping OF
node reference, so bailing out on errors misses this.  Solve the OF node
reference leak with scoped for_each_available_child_of_node_scoped().

Fixes: 3fd6d6e ("thermal/of: Rework the thermal device tree initialization")
Cc: <stable@vger.kernel.org>
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Reviewed-by: Chen-Yu Tsai <wenst@chromium.org>
Reviewed-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Link: https://patch.msgid.link/20240814195823.437597-3-krzysztof.kozlowski@linaro.org
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

Author: krzk

drivers/thermal/thermal_of.c

@@ -184,14 +184,14 @@ static struct device_node *of_thermal_zone_find(struct device_node *sensor, int
 	 * Search for each thermal zone, a defined sensor
 	 * corresponding to the one passed as parameter
 	 */
-	for_each_available_child_of_node(np, tz) {
+	for_each_available_child_of_node_scoped(np, child) {
 
 		int count, i;
 
-		count = of_count_phandle_with_args(tz, "thermal-sensors",
+		count = of_count_phandle_with_args(child, "thermal-sensors",
 						   "#thermal-sensor-cells");
 		if (count <= 0) {
-			pr_err("%pOFn: missing thermal sensor\n", tz);
+			pr_err("%pOFn: missing thermal sensor\n", child);
 			tz = ERR_PTR(-EINVAL);
 			goto out;
 		}
@@ -200,18 +200,19 @@ static struct device_node *of_thermal_zone_find(struct device_node *sensor, int
 
 			int ret;
 
-			ret = of_parse_phandle_with_args(tz, "thermal-sensors",
+			ret = of_parse_phandle_with_args(child, "thermal-sensors",
 							 "#thermal-sensor-cells",
 							 i, &sensor_specs);
 			if (ret < 0) {
-				pr_err("%pOFn: Failed to read thermal-sensors cells: %d\n", tz, ret);
+				pr_err("%pOFn: Failed to read thermal-sensors cells: %d\n", child, ret);
 				tz = ERR_PTR(ret);
 				goto out;
 			}
 
 			if ((sensor == sensor_specs.np) && id == (sensor_specs.args_count ?
 								  sensor_specs.args[0] : 0)) {
-				pr_debug("sensor %pOFn id=%d belongs to %pOFn\n", sensor, id, tz);
+				pr_debug("sensor %pOFn id=%d belongs to %pOFn\n", sensor, id, child);
+				tz = no_free_ptr(child);
 				goto out;
 			}
 		}