From d2f452c2400f8fdabb8a87d9297ac602edfd0374 Mon Sep 17 00:00:00 2001
From: Anna Shaleva <shaleva.ann@nspcc.ru>
Date: Wed, 15 Jul 2020 13:53:24 +0300
Subject: [PATCH] core: adjust System.Contract.CallEx interop

Part of #1055
---
 pkg/core/interop_system.go | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/pkg/core/interop_system.go b/pkg/core/interop_system.go
index 3d84b7d24..06632c813 100644
--- a/pkg/core/interop_system.go
+++ b/pkg/core/interop_system.go
@@ -422,6 +422,9 @@ func contractCallEx(ic *interop.Context, v *vm.VM) error {
 	method := v.Estack().Pop().Item()
 	args := v.Estack().Pop().Item()
 	flags := smartcontract.CallFlag(int32(v.Estack().Pop().BigInt().Int64()))
+	if flags&^smartcontract.All != 0 {
+		return errors.New("call flags out of range")
+	}
 	return contractCallExInternal(ic, v, h, method, args, flags)
 }