| // run |
| |
| // Copyright 2010 The Go Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style |
| // license that can be found in the LICENSE file. |
| |
| // Issue 1011. Removing either #1 or #3 avoided the crash at #2. |
| |
| package main |
| |
| import ( |
| "io" |
| "strings" |
| ) |
| |
| func readU16BE(b []byte) uint16 { |
| b[0] = 0 |
| b[1] = 1 |
| return uint16(b[0])<<8 + uint16(b[1]) // #1 |
| n := uint16(b[0])<<8 + uint16(b[1]) |
| return n |
| } |
| |
| func readStr(r io.Reader, b []byte) string { |
| n := readU16BE(b) |
| if int(n) > len(b) { |
| return "err: n>b" |
| } |
| io.ReadFull(r, b[0:n]) // #2 |
| return string(b[0:n]) // #3 |
| return "ok" |
| } |
| |
| func main() { |
| br := strings.NewReader("abcd") |
| readStr(br, make([]byte, 256)) |
| } |
