The correct type for the size of a chunk of memory is size_t.

base/shared_memory_android.cc

 // Copyright (c) 2011 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 <sys/mman.h>
 
 #include "base/logging.h"
 #include "third_party/ashmem/ashmem.h"
 
 namespace base {
 
 // For Android, we use ashmem to implement SharedMemory. ashmem_create_region
 // will automatically pin the region. We never explicitly call pin/unpin. When
 // all the file descriptors from different processes associated with the region
 // are closed, the memory buffer will go away.
 
 bool SharedMemory::Create(const SharedMemoryCreateOptions& options) {
   DCHECK_EQ(-1, mapped_file_ );
 
+  if (options.size > static_cast<size_t>(std::numeric_limits<int>::max()))
+    return false;
+
   // "name" is just a label in ashmem. It is visible in /proc/pid/maps.
   mapped_file_ = ashmem_create_region(
       options.name == NULL ? "" : options.name->c_str(),
       options.size);
   if (-1 == mapped_file_) {
     DLOG(ERROR) << "Shared memory creation failed";
     return false;
   }
 
   int err = ashmem_set_prot_region(mapped_file_,
@@ skipping 13 matching lines @@
   return true;
 }
 
 bool SharedMemory::Open(const std::string& name, bool read_only) {
   // ashmem doesn't support name mapping
   NOTIMPLEMENTED();
   return false;
 }
 
 }  // namespace base