Make sure buffers are large enough to hold the Result structure.

gpu/command_buffer/build_gles2_cmd_buffer.py

 #!/usr/bin/env python
 # Copyright (c) 2012 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 """code generator for GLES2 command buffers."""
 
 import itertools
 import os
 import os.path
@@ skipping 6685 matching lines @@
     last_arg = func.GetLastOriginalArg()
     # All except shm_id and shm_offset.
     all_but_last_args = func.GetCmdArgs()[:-2]
     for arg in all_but_last_args:
       arg.WriteGetCode(f)
 
     code = """  unsigned int buffer_size = 0;
   typedef cmds::%(func_name)s::Result Result;
   Result* result = GetSharedMemoryAndSizeAs<Result*>(
       c.%(last_arg_name)s_shm_id, c.%(last_arg_name)s_shm_offset,
-      &buffer_size);
+      sizeof(Result), &buffer_size);
   %(last_arg_type)s %(last_arg_name)s = result ? result->GetData() : NULL;
   if (%(last_arg_name)s == NULL) {
     return error::kOutOfBounds;
   }
   GLsizei bufsize = Result::ComputeMaxResults(buffer_size);
   GLsizei written_values = 0;
   GLsizei* length = &written_values;
 """
     f.write(code % {
         'last_arg_type': last_arg.type,
@@ skipping 4532 matching lines @@
   Format(gen.generated_cpp_filenames)
 
   if gen.errors > 0:
     print "%d errors" % gen.errors
     return 1
   return 0
 
 
 if __name__ == '__main__':
   sys.exit(main(sys.argv[1:]))