OverflowInRead.java revision 15337:997eb92cd683 
1/*
2 * Copyright (c) 2016, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 */
23
24/* @test
25 * @bug 8163518
26 * @summary Integer overflow when reading in large buffer
27 * @requires (sun.arch.data.model == "64" & os.maxMemory > 8g)
28 * @run main/othervm -Xmx8g OverflowInRead
29 */
30
31import java.io.CharArrayReader;
32
33public class OverflowInRead {
34    public static void main(String[] args) throws Exception {
35        char[] a = "_123456789_123456789_123456789_123456789"
36                .toCharArray(); // a.length > 33
37        try (CharArrayReader car = new CharArrayReader(a)) {
38            int len1 = 33;
39            char[] buf1 = new char[len1];
40            if (car.read(buf1, 0, len1) != len1)
41                throw new Exception("Expected to read " + len1 + " chars");
42
43            int len2 = Integer.MAX_VALUE - 32;
44            char[] buf2 = new char[len2];
45            int expLen2 = a.length - len1;
46            if (car.read(buf2, 0, len2) != expLen2)
47                throw new Exception("Expected to read " + expLen2 + " chars");
48        }
49    }
50}
51