diff --git a/drivers/hwmon/gpio-fan.c b/drivers/hwmon/gpio-fan.c
index 685568b1236d..f78e677b858e 100644
--- a/drivers/hwmon/gpio-fan.c
+++ b/drivers/hwmon/gpio-fan.c
@@ -422,6 +422,9 @@ static int gpio_fan_set_cur_state(struct thermal_cooling_device *cdev,
 	if (!fan_data)
 		return -EINVAL;
 
+	if (state >= fan_data->num_speed)
+		return -EINVAL;
+
 	set_fan_speed(fan_data, state);
 	return 0;
 }