win: Fix x64 compile error in handle writer

minidump/minidump_handle_writer.cc

 // Copyright 2015 The Crashpad Authors. All rights reserved.
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
 // You may obtain a copy of the License at
 //
 //     http://www.apache.org/licenses/LICENSE-2.0
 //
 // Unless required by applicable law or agreed to in writing, software
 // distributed under the License is distributed on an "AS IS" BASIS,
 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
 #include "minidump/minidump_handle_writer.h"
 
 #include <string>
 
 #include "base/logging.h"
 #include "base/stl_util.h"
 #include "minidump/minidump_extensions.h"
 #include "util/file/file_writer.h"
+#include "util/numeric/safe_assignment.h"
 
 namespace crashpad {
 
 MinidumpHandleDataWriter::MinidumpHandleDataWriter()
     : handle_data_stream_base_(), handle_descriptors_(), strings_() {
 }
 
 MinidumpHandleDataWriter::~MinidumpHandleDataWriter() {
   STLDeleteContainerPairSecondPointers(strings_.begin(), strings_.end());
 }
@@ skipping 36 matching lines @@
 }
 
 bool MinidumpHandleDataWriter::Freeze() {
   DCHECK_EQ(state(), kStateMutable);
 
   if (!MinidumpStreamWriter::Freeze())
     return false;
 
   handle_data_stream_base_.SizeOfHeader = sizeof(handle_data_stream_base_);
   handle_data_stream_base_.SizeOfDescriptor = sizeof(handle_descriptors_[0]);
-  handle_data_stream_base_.NumberOfDescriptors = handle_descriptors_.size();
+  const size_t handle_count = handle_descriptors_.size();
+  if (!AssignIfInRange(&handle_data_stream_base_.NumberOfDescriptors,
+                       handle_count)) {
+    LOG(ERROR) << "handle_count " << handle_count << " out of range";
+    return false;
+  }
   handle_data_stream_base_.Reserved = 0;
 
   return true;
 }
 
 size_t MinidumpHandleDataWriter::SizeOfObject() {
   DCHECK_GE(state(), kStateFrozen);
   return sizeof(handle_data_stream_base_) +
          sizeof(handle_descriptors_[0]) * handle_descriptors_.size();
 }
@@ skipping 22 matching lines @@
   }
 
   return file_writer->WriteIoVec(&iovecs);
 }
 
 MinidumpStreamType MinidumpHandleDataWriter::StreamType() const {
   return kMinidumpStreamTypeHandleData;
 }
 
 }  // namespace crashpad