diff --git a/drivers/net/phy/mdio_bus.c b/drivers/net/phy/mdio_bus.c
index 757763735e1f5..fdf8221f46fa5 100644
--- a/drivers/net/phy/mdio_bus.c
+++ b/drivers/net/phy/mdio_bus.c
@@ -117,7 +117,12 @@ EXPORT_SYMBOL(mdiobus_unregister_device);
 
 struct phy_device *mdiobus_get_phy(struct mii_bus *bus, int addr)
 {
-	struct mdio_device *mdiodev = bus->mdio_map[addr];
+	struct mdio_device *mdiodev;
+
+	if (addr < 0 || addr >= ARRAY_SIZE(bus->mdio_map))
+		return NULL;
+
+	mdiodev = bus->mdio_map[addr];
 
 	if (!mdiodev)
 		return NULL;