node, 124 bytes

Result

WA

Duration

995ms

Code [DL]

process.stdin.on('data',s=>{[h,w]=(''+s).split(`
`),a='*'.repeat(w)+`
`,console.log(a+(`*${' '.repeat(w-2)}*
`)[r](h-2)+a)})

stdin

99
27

stdout

stderr

/volume/CODE:4
`)[r](h-2)+a)})
   ^

ReferenceError: r is not defined
    at Socket.process.stdin.on.s (/volume/CODE:4:4)
    at Socket.emit (events.js:182:13)
    at addChunk (_stream_readable.js:283:12)
    at readableAddChunk (_stream_readable.js:264:11)
    at Socket.Readable.push (_stream_readable.js:219:10)
    at Pipe.onStreamRead [as onread] (internal/stream_base_commons.js:94:17)