message: Fixed the possible crash(heap-use-after-free).
diff: @@ -120,10 +120,10 @@ void SetConfigProcessor::setNestedConfig(const cpp2::ConfigModule& module, const
  LOG(ERROR) << "Should not reach here";
  continue;
  }
  - auto key = field.substr(0, pos).c_str();
  + auto key = field.substr(0, pos);
  auto value = field.substr(pos + 1);
  // TODO: Maybe need to handle illegal value here
  - if (mutableFields_.count(key) && conf.updateStringField(key, value).ok()) {
  + if (mutableFields_.count(key) && conf.updateStringField(key.c_str(), value).ok()) {
  updated = true;
  }
  }
  