Good day, fellow lispers

In following code, does "return-from all" frees mapcar's stack frame or would lead to stack overflow?

(defun all (fun xs)
  (mapcar (lambda (x) (unless (funcall fun x)
                        (return-from all nil)))
          xs)
  t)

>>11
I can't vouch for CL, but in Scheme a "statement" is just an expression that yields an undefined value or values.
>>7
What about if?