Throw cart error for price_too_high

src/pretix/base/services/cart.py

@@ -232,6 +232,8 @@ class CartManager:
     def _get_price(self, item: Item, variation: Optional[ItemVariation],
                    voucher: Optional[Voucher], custom_price: Optional[Decimal],
                    subevent: Optional[SubEvent], cp_is_net: bool=None):
+        if custom_price and custom_price > 100000000:
+            raise CartError(error_messages['price_too_high'])
         return get_price(
             item, variation, voucher, custom_price, subevent,
             custom_price_is_net=cp_is_net if cp_is_net is not None else self.event.settings.display_net_prices,