node, 112 bytes

Result

AC

Duration

1140ms

Code [DL]

[a,b]=(0+require('fs').readFileSync(i=0)).split(`
`)
for(;i<a;)console.log(`*${'* '[+(i++&&i<a)].repeat(b-2)}*`)

stdin

15
89

stdout

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

stderr