Fix shared_memory_posix Map()

base/shared_memory_posix.cc

 // 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.
 
 #include "base/shared_memory.h"
 
 #include <errno.h>
 #include <fcntl.h>
 #include <sys/mman.h>
 #include <sys/stat.h>
@@ skipping 221 matching lines @@
     // TODO(port): we set the created size here so that it is available in
     // transport_dib_android.cc. We should use ashmem_get_size_region()
     // in transport_dib_android.cc.
     created_size_ = bytes;
   }
 #endif
 
   memory_ = mmap(NULL, bytes, PROT_READ | (read_only_ ? 0 : PROT_WRITE),
                  MAP_SHARED, mapped_file_, 0);
 
-  if (memory_)
+  bool mmap_succeeded = memory_ != (void*)-1 && memory_ != NULL;
+  if (mmap_succeeded)
     mapped_size_ = bytes;
+  else
+    memory_ = NULL;
 
-  bool mmap_succeeded = (memory_ != (void*)-1);
-  DCHECK(mmap_succeeded) << "Call to mmap failed, errno=" << errno;
   return mmap_succeeded;
 }
 
 bool SharedMemory::Unmap() {
   if (memory_ == NULL)
     return false;
 
   munmap(memory_, mapped_size_);
   memory_ = NULL;
   mapped_size_ = 0;
@@ skipping 109 matching lines @@
   new_handle->fd = new_fd;
   new_handle->auto_close = true;
 
   if (close_self)
     Close();
 
   return true;
 }
 
 }  // namespace base