php, 112 bytes

Result

AC

Duration

991ms

Code [DL]

<?php $h=fgets(STDIN)-1;$w=fgets(STDIN)-2;for($y=$h+1;$y-->0;)echo"*".str_repeat($y>0&$y<$h?" ":"*",$w)."*\n"?>

stdin

68
78

stdout

******************************************************************************
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******************************************************************************

stderr

PHP Notice:  A non well formed numeric value encountered in /volume/CODE on line 1
PHP Notice:  A non well formed numeric value encountered in /volume/CODE on line 1