diff --git a/drivers/amlogic/media/vout/hdmitx/hdmi_tx_20/hdmi_tx_main.c b/drivers/amlogic/media/vout/hdmitx/hdmi_tx_20/hdmi_tx_main.c
index c1d4cc11deca..f6e2c708dffd 100644
--- a/drivers/amlogic/media/vout/hdmitx/hdmi_tx_20/hdmi_tx_main.c
+++ b/drivers/amlogic/media/vout/hdmitx/hdmi_tx_20/hdmi_tx_main.c
@@ -2231,7 +2231,7 @@ static ssize_t store_valid_mode(struct device *dev,
 	struct device_attribute *attr, const char *buf, size_t count)
 {
 	memset(cvalid_mode, 0, sizeof(cvalid_mode));
-	memcpy(cvalid_mode, buf, sizeof(cvalid_mode));
+	strncpy(cvalid_mode, buf, sizeof(cvalid_mode));
 	cvalid_mode[31] = '\0';
 	return count;
 }