1// run
2
3// Copyright 2010 The Go Authors. All rights reserved.
4// Use of this source code is governed by a BSD-style
5// license that can be found in the LICENSE file.
6
7// Issue 1011.  Removing either #1 or #3 avoided the crash at #2.
8
9package main
10
11import (
12	"io"
13	"strings"
14)
15
16func readU16BE(b []byte) uint16 {
17	b[0] = 0
18	b[1] = 1
19	return uint16(b[0])<<8 + uint16(b[1]) // #1
20	n := uint16(b[0])<<8 + uint16(b[1])
21	return n
22}
23
24func readStr(r io.Reader, b []byte) string {
25	n := readU16BE(b)
26	if int(n) > len(b) {
27		return "err: n>b"
28	}
29	io.ReadFull(r, b[0:n]) // #2
30	return string(b[0:n])  // #3
31	return "ok"
32}
33
34func main() {
35	br := strings.NewReader("abcd")
36	readStr(br, make([]byte, 256))
37}
38