diff --git a/drivers/net/phy/realtek.c b/drivers/net/phy/realtek.c
index 25e5bfbb6f89..c15d2f66ef0d 100644
--- a/drivers/net/phy/realtek.c
+++ b/drivers/net/phy/realtek.c
@@ -527,6 +527,9 @@ static int rtl8211f_led_hw_control_get(struct phy_device *phydev, u8 index,
 {
 	int val;
 
+	if (index >= RTL8211F_LED_COUNT)
+		return -EINVAL;
+
 	val = phy_read_paged(phydev, 0xd04, RTL8211F_LEDCR);
 	if (val < 0)
 		return val;