diff --git a/drivers/net/wireless/realtek/rtw88/debug.c b/drivers/net/wireless/realtek/rtw88/debug.c
index 6ad985e98e42..5a906101498d 100644
--- a/drivers/net/wireless/realtek/rtw88/debug.c
+++ b/drivers/net/wireless/realtek/rtw88/debug.c
@@ -146,6 +146,8 @@ static int rtw_debugfs_copy_from_user(char tmp[], int size,
 {
 	int tmp_len;
 
+	memset(tmp, 0, size);
+
 	if (count < num)
 		return -EFAULT;