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 > 4g)
  28  * @run main/othervm -Xmx4g OverflowInRead
  29  */
  30 
  31 import java.io.StringBufferInputStream;
  32 
  33 public class OverflowInRead {
  34     public static void main(String[] args) throws Exception {
  35         String s = "_123456789_123456789_123456789_123456789"; // s.length() > 33
  36         try (StringBufferInputStream sbis = new StringBufferInputStream(s)) {
  37             int len1 = 33;
  38             byte[] buf1 = new byte[len1];
  39             if (sbis.read(buf1, 0, len1) != len1)
  40                 throw new Exception("Expected to read " + len1 + " bytes");
  41 
  42             int len2 = Integer.MAX_VALUE - 32;
  43             byte[] buf2 = new byte[len2];
  44             int expLen2 = s.length() - len1;
  45             if (sbis.read(buf2, 0, len2) != expLen2)
  46                 throw new Exception("Expected to read " + expLen2 + " bytes");
  47         }
  48     }
  49 }