diff --git a/extras/kernel/ebbchar/ebbchar.c b/extras/kernel/ebbchar/ebbchar.c
index 771b859..b5fc0d2 100644
--- a/extras/kernel/ebbchar/ebbchar.c
+++ b/extras/kernel/ebbchar/ebbchar.c
@@ -142,7 +142,10 @@ static ssize_t dev_read(struct file *filep, char *buffer, size_t len, loff_t *of
  *  @param offset The offset if required
  */
 static ssize_t dev_write(struct file *filep, const char *buffer, size_t len, loff_t *offset){
-   sprintf(message, "%s(%zu letters)", buffer, len);   // appending received string with its length
+    if (copy_from_user(message, buffer, len)){
+        printk(KERN_ALERT "EBBChar: kernel failed  to copy message from user space\n");
+        return -EFAULT;
+    }
    size_of_message = strlen(message);                 // store the length of the stored message
    printk(KERN_INFO "EBBChar: Received %zu characters from the user\n", len);
    return len;