diff --git a/drivers/gpu/drm/amd/display/dc/dcn21/dcn21_resource.c b/drivers/gpu/drm/amd/display/dc/dcn21/dcn21_resource.c
index d1a25fe6c44f..8dffa5b6426e 100644
--- a/drivers/gpu/drm/amd/display/dc/dcn21/dcn21_resource.c
+++ b/drivers/gpu/drm/amd/display/dc/dcn21/dcn21_resource.c
@@ -1315,7 +1315,7 @@ static struct link_encoder *dcn21_link_encoder_create(
 		kzalloc(sizeof(struct dcn21_link_encoder), GFP_KERNEL);
 	int link_regs_id;
 
-	if (!enc21)
+	if (!enc21 || enc_init_data->hpd_source >= ARRAY_SIZE(link_enc_hpd_regs))
 		return NULL;
 
 	link_regs_id =