1 files changed, 10 insertions, 0 deletions

diff --git a/drivers/gpu/drm/imx/imx-ldb.c b/drivers/gpu/drm/imx/imx-ldb.c
index d38648a7ef2d..d88ac6f2222a 100644
--- a/drivers/gpu/drm/imx/imx-ldb.c
+++ b/drivers/gpu/drm/imx/imx-ldb.c
@@ -206,6 +206,11 @@ static void imx_ldb_encoder_enable(struct drm_encoder *encoder)
         int dual = ldb->ldb_ctrl & LDB_SPLIT_MODE_EN;
         int mux = drm_of_encoder_active_port_id(imx_ldb_ch->child, encoder);
 
+        if (mux < 0 || mux >= ARRAY_SIZE(ldb->clk_sel)) {
+                dev_warn(ldb->dev, "%s: invalid mux %d\n", __func__, mux);
+                return;
+        }
+
         drm_panel_prepare(imx_ldb_ch->panel);
 
         if (dual) {
@@ -264,6 +269,11 @@ imx_ldb_encoder_atomic_mode_set(struct drm_encoder *encoder,
         int mux = drm_of_encoder_active_port_id(imx_ldb_ch->child, encoder);
         u32 bus_format = imx_ldb_ch->bus_format;
 
+        if (mux < 0 || mux >= ARRAY_SIZE(ldb->clk_sel)) {
+                dev_warn(ldb->dev, "%s: invalid mux %d\n", __func__, mux);
+                return;
+        }
+
         if (mode->clock > 170000) {
                 dev_warn(ldb->dev,
                          "%s: mode exceeds 170 MHz pixel clock\n", __func__);