bool ServiceWorkerPaymentInstrument::IsValidForModifier(
    const std::string& method,
    bool supported_networks_specified,
    const std::set<std::string>& supported_networks,
    bool supported_types_specified,
    const std::set<autofill::CreditCard::CardType>& supported_types) const {
  if (needs_installation_)
    return installable_enabled_method_ == method;

  if (!base::ContainsValue(stored_payment_app_info_->enabled_methods, method))
    return false;

  if (method != "basic-card")
    return true;

  if (!supported_networks_specified && !supported_types_specified)
    return true;

  if (stored_payment_app_info_->capabilities.empty())
    return false;

  uint32_t i = 0;
  for (; i < stored_payment_app_info_->capabilities.size(); i++) {
    if (supported_networks_specified) {
      std::set<std::string> app_supported_networks;
      for (const auto& network :
           stored_payment_app_info_->capabilities[i].supported_card_networks) {
        app_supported_networks.insert(GetBasicCardNetworkName(
            static_cast<mojom::BasicCardNetwork>(network)));
      }

      if (base::STLSetIntersection<std::set<std::string>>(
              app_supported_networks, supported_networks)
              .empty()) {
        continue;
      }
    }

    if (supported_types_specified) {
      std::set<autofill::CreditCard::CardType> app_supported_types;
      for (const auto& type :
           stored_payment_app_info_->capabilities[i].supported_card_types) {
        app_supported_types.insert(
            GetBasicCardType(static_cast<mojom::BasicCardType>(type)));
      }

      if (base::STLSetIntersection<std::set<autofill::CreditCard::CardType>>(
              app_supported_types, supported_types)
              .empty()) {
        continue;
      }
    }

    break;
  }

  return i < stored_payment_app_info_->capabilities.size();
}

The product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory belongs to the code that operates on the new pointer.