Add missing string length check in regexp engine.

src/ia32/regexp-macro-assembler-ia32.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 298 matching lines @@
 
   // The length of a capture should not be negative. This can only happen
   // if the end of the capture is unrecorded, or at a point earlier than
   // the start of the capture.
   BranchOrBacktrack(less, on_no_match);
 
   // If length is zero, either the capture is empty or it is completely
   // uncaptured. In either case succeed immediately.
   __ j(equal, &fallthrough);
 
+  // Check that there are sufficient characters left in the input.
+  __ mov(eax, edi);
+  __ add(eax, ebx);
+  BranchOrBacktrack(greater, on_no_match);
+
   if (mode_ == ASCII) {
     Label success;
     Label fail;
     Label loop_increment;
     // Save register contents to make the registers available below.
     __ push(edi);
     __ push(backtrack_stackpointer());
     // After this, the eax, ecx, and edi registers are available.
 
     __ add(edx, esi);  // Start of capture
@@ skipping 1065 matching lines @@
 }
 
 
 #undef __
 
 #endif  // V8_INTERPRETED_REGEXP
 
 }}  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_IA32