- Do not read past the end of the utf32_array.

runtime/vm/object_test.cc

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "platform/assert.h"
 #include "vm/assembler.h"
 #include "vm/bigint_operations.h"
 #include "vm/class_finalizer.h"
 #include "vm/isolate.h"
 #include "vm/object.h"
@@ skipping 1430 matching lines @@
   EXPECT(fourstr.IsTwoByteString());
   EXPECT(!fourstr.Equals(""));
   EXPECT(!fourstr.Equals("\xF0\x90\x8E\xA0"));
   EXPECT(!fourstr.Equals("\xF0\x90\x8E\xA0\xF0\x90\x8E\xA1"));
   EXPECT(fourstr.Equals("\xF0\x90\x8E\xA0\xF0\x90\x8E\xA1\xF0\x90\x8E\xA2"));
   EXPECT(!fourstr.Equals("\xF0\x90\x8E\xA0\xF0\x90\x8E\xA1"
                          "\xF0\x90\x8E\xA2\xF0\x90\x8E\xA3"));
 }
 
 
+TEST_CASE(StringEqualsUTF32) {
+  const String& empty = String::Handle(String::New(""));
+  const String& t_str = String::Handle(String::New("t"));
+  const String& th_str = String::Handle(String::New("th"));
+  const int32_t chars[] = {'t', 'h', 'i', 's'};
+  EXPECT(!empty.Equals(chars, -1));
+  EXPECT(empty.Equals(chars, 0));
+  EXPECT(!empty.Equals(chars, 1));
+  EXPECT(!t_str.Equals(chars, 0));
+  EXPECT(t_str.Equals(chars, 1));
+  EXPECT(!t_str.Equals(chars, 2));
+  EXPECT(!th_str.Equals(chars, 1));
+  EXPECT(th_str.Equals(chars, 2));
+  EXPECT(!th_str.Equals(chars, 3));
+}
+
+
 TEST_CASE(ExternalOneByteString) {
   uint8_t characters[] = { 0xF6, 0xF1, 0xE9 };
   intptr_t len = ARRAY_SIZE(characters);
 
   const String& str =
       String::Handle(
           ExternalOneByteString::New(characters, len, NULL, NULL, Heap::kNew));
   EXPECT(!str.IsOneByteString());
   EXPECT(str.IsExternalOneByteString());
   EXPECT_EQ(str.Length(), len);
@@ skipping 1789 matching lines @@
   EXPECT_NE(test1.SourceFingerprint(), test3.SourceFingerprint());
   EXPECT_NE(test3.SourceFingerprint(), test4.SourceFingerprint());
   EXPECT_NE(test4.SourceFingerprint(), test5.SourceFingerprint());
   EXPECT_NE(test5.SourceFingerprint(), test6.SourceFingerprint());
   EXPECT_EQ(test6.SourceFingerprint(), test7.SourceFingerprint());
 }
 
 #endif  // defined(TARGET_ARCH_IA32) || defined(TARGET_ARCH_X64).
 
 }  // namespace dart