net: dsa: microchip: ksz_common: Fix refcount leak bug

In ksz_switch_register(), we should call of_node_put() for the
reference returned by of_get_child_by_name() which has increased
the refcount.

Fixes: 912aae27c6af ("net: dsa: microchip: really look for phy-mode in port nodes")
Signed-off-by: Liang He <windhl@126.com>
Reviewed-by: Vladimir Oltean <olteanv@gmail.com>
Link: https://lore.kernel.org/r/20220714153138.375919-1-windhl@126.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

diff --git a/drivers/net/dsa/microchip/ksz_common.c b/drivers/net/dsa/microchip/ksz_common.c
index 9ca8c8d7740f4d8da599be17cb84cd620af33fb3..92a500e1ccd216162ef5affc7d138b3999c01403 100644 (file)
--- a/drivers/net/dsa/microchip/ksz_common.c
+++ b/drivers/net/dsa/microchip/ksz_common.c
@@ -1038,18 +1038,21 @@ int ksz_switch_register(struct ksz_device *dev,
                ports = of_get_child_by_name(dev->dev->of_node, "ethernet-ports");
                if (!ports)
                        ports = of_get_child_by_name(dev->dev->of_node, "ports");
-               if (ports)
+               if (ports) {
                        for_each_available_child_of_node(ports, port) {
                                if (of_property_read_u32(port, "reg",
                                                         &port_num))
                                        continue;
                                if (!(dev->port_mask & BIT(port_num))) {
                                        of_node_put(port);
+                                       of_node_put(ports);
                                        return -EINVAL;
                                }
                                of_get_phy_mode(port,
                                                &dev->ports[port_num].interface);
                        }
+                       of_node_put(ports);
+               }
                dev->synclko_125 = of_property_read_bool(dev->dev->of_node,
                                                         "microchip,synclko-125");
                dev->synclko_disable = of_property_read_bool(dev->dev->of_node,