diff --git a/drivers/gpu/drm/mediatek/mtk_hdmi.c b/drivers/gpu/drm/mediatek/mtk_hdmi.c
index 43e9876fd50c97bc561db2a334da83e5a2c615d7..7bc086ec74f7fe3688ba2dfff1a2417f3161a8eb 100644
--- a/drivers/gpu/drm/mediatek/mtk_hdmi.c
+++ b/drivers/gpu/drm/mediatek/mtk_hdmi.c
@@ -978,7 +978,7 @@ static int mtk_hdmi_setup_avi_infoframe(struct mtk_hdmi *hdmi,
 					struct drm_display_mode *mode)
 {
 	struct hdmi_avi_infoframe frame;
-	u8 buffer[17];
+	u8 buffer[HDMI_INFOFRAME_HEADER_SIZE + HDMI_AVI_INFOFRAME_SIZE];
 	ssize_t err;
 
 	err = drm_hdmi_avi_infoframe_from_display_mode(&frame,
@@ -1004,7 +1004,7 @@ static int mtk_hdmi_setup_spd_infoframe(struct mtk_hdmi *hdmi,
 					const char *product)
 {
 	struct hdmi_spd_infoframe frame;
-	u8 buffer[29];
+	u8 buffer[HDMI_INFOFRAME_HEADER_SIZE + HDMI_SPD_INFOFRAME_SIZE];
 	ssize_t err;
 
 	err = hdmi_spd_infoframe_init(&frame, vendor, product);
@@ -1027,7 +1027,7 @@ static int mtk_hdmi_setup_spd_infoframe(struct mtk_hdmi *hdmi,
 static int mtk_hdmi_setup_audio_infoframe(struct mtk_hdmi *hdmi)
 {
 	struct hdmi_audio_infoframe frame;
-	u8 buffer[14];
+	u8 buffer[HDMI_INFOFRAME_HEADER_SIZE + HDMI_AUDIO_INFOFRAME_SIZE];
 	ssize_t err;
 
 	err = hdmi_audio_infoframe_init(&frame);