Fix grokdump inspector search for invalid addresses.

tools/grokdump.py

 #!/usr/bin/env python
 #
 # 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
@@ skipping 1444 matching lines @@
     """
      Interpret memory at the given address (if available) as a sequence
      of words. Automatic alignment is not performed.
     """
     start = int(address, 16)
     if (start & self.heap.ObjectAlignmentMask()) != 0:
       print "Warning: Dumping un-aligned memory, is this what you had in mind?"
     for slot in xrange(start,
                        start + self.reader.PointerSize() * 10,
                        self.reader.PointerSize()):
+      if not self.reader.IsValidAddress(slot):
+        print "Address is not contained within the minidump!"
+        return
       maybe_address = self.reader.ReadUIntPtr(slot)
       heap_object = self.padawan.SenseObject(maybe_address)
       print "%s: %s %s" % (self.reader.FormatIntPtr(slot),
                            self.reader.FormatIntPtr(maybe_address),
                            heap_object or '')
 
   def do_do(self, address):
     """
      Interpret memory at the given address as a V8 object. Automatic
      alignment makes sure that you can pass tagged as well as un-tagged
@@ skipping 174 matching lines @@
   parser = optparse.OptionParser(USAGE)
   parser.add_option("-s", "--shell", dest="shell", action="store_true",
                     help="start an interactive inspector shell")
   parser.add_option("-f", "--full", dest="full", action="store_true",
                     help="dump all information contained in the minidump")
   options, args = parser.parse_args()
   if len(args) != 1:
     parser.print_help()
     sys.exit(1)
   AnalyzeMinidump(options, args[0])