Update to handle dsym files that end with a header.

src/common/dwarf/dwarf2reader.cc

 // Copyright (c) 2010 Google Inc. 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
@@ skipping 248 matching lines @@
   header_.length = initial_length;
 
   assert(headerptr + 2 < buffer_ + buffer_length_);
   header_.version = reader_->ReadTwoBytes(headerptr);
   headerptr += 2;
 
   assert(headerptr + reader_->OffsetSize() < buffer_ + buffer_length_);
   header_.abbrev_offset = reader_->ReadOffset(headerptr);
   headerptr += reader_->OffsetSize();
 
-  assert(headerptr + 1 < buffer_ + buffer_length_);
+  // Compare against less than or equal because this may be the last
+  // section in the file.
+  assert(headerptr + 1 <= buffer_ + buffer_length_);
   header_.address_size = reader_->ReadOneByte(headerptr);
   reader_->SetAddressSize(header_.address_size);
   headerptr += 1;
 
   after_header_ = headerptr;
 
   // This check ensures that we don't have to do checking during the
   // reading of DIEs. header_.length does not include the size of the
   // initial length.
   assert(buffer_ + initial_length_size + header_.length <=
@@ skipping 2443 matching lines @@
                                               uint64 insn_offset) {
   fprintf(stderr,
           "%s: CFI %s at offset 0x%llx in section '%s':"
           " the DW_CFA_restore_state instruction at offset 0x%llx"
           " would clear the CFA rule in effect\n",
           filename_.c_str(), CallFrameInfo::KindName(kind), offset,
           section_.c_str(), insn_offset);
 }
 
 }  // namespace dwarf2reader