[janitor] update the isicom.c multiport serial driver to

	1) check the result of copy_from_user 
	2) return -EFAULT in case not all data was copied
	3) release resources in case of failure

drivers/char/isicom.c

@@ -1254,7 +1254,11 @@ static int isicom_write(struct tty_struct * tty, int from_user,
 			   created more space in xmit_buf when the ctrl 
 			   gets back here  */
 			sti(); 
-			copy_from_user(tmp_buf, buf, cnt);
+			if (copy_from_user(tmp_buf, buf, cnt)) {
+				up(&tmp_buf_sem);
+				restore_flags(flags);
+				return -EFAULT;
+			}
 			cli();
 			cnt = MIN(cnt, MIN(SERIAL_XMIT_SIZE - port->xmit_cnt - 1,
 			SERIAL_XMIT_SIZE - port->xmit_head));