diff --git a/sys/dev/drm/amd/powerplay/hwmgr/smu10_hwmgr.c b/sys/dev/drm/amd/powerplay/hwmgr/smu10_hwmgr.c
--- a/sys/dev/drm/amd/powerplay/hwmgr/smu10_hwmgr.c
+++ b/sys/dev/drm/amd/powerplay/hwmgr/smu10_hwmgr.c
@@ -741,6 +741,9 @@
 {
 	struct smu10_power_state *smu10_ps = cast_smu10_ps(hw_ps);
 
+	if (index >= SMU10_MAX_HARDWARE_POWERLEVELS)
+		return -EINVAL;
+
 	smu10_ps->levels[index].engine_clock = 0;
 
 	smu10_ps->levels[index].vddc_index = 0;