From 4a8be486f01f1990d0357ddaadb2cbe09a85c2b3 Mon Sep 17 00:00:00 2001
From: Evgenii Stratonikov <evgeniy@nspcc.ru>
Date: Wed, 18 Sep 2019 14:24:42 +0300
Subject: [PATCH] vm: do not pop items in OVER

---
 pkg/vm/vm.go      | 7 +------
 pkg/vm/vm_test.go | 2 ++
 2 files changed, 3 insertions(+), 6 deletions(-)

diff --git a/pkg/vm/vm.go b/pkg/vm/vm.go
index a523642d5..2bed4fb6c 100644
--- a/pkg/vm/vm.go
+++ b/pkg/vm/vm.go
@@ -408,15 +408,10 @@ func (v *VM) execute(ctx *Context, op Instruction) {
 		}
 
 	case OVER:
-		b := v.estack.Pop()
-		if b == nil {
-			panic("no top-level element found")
-		}
-		a := v.estack.Peek(0)
+		a := v.estack.Peek(1)
 		if a == nil {
 			panic("no second element found")
 		}
-		v.estack.Push(b)
 		v.estack.Push(a)
 
 	case PICK:
diff --git a/pkg/vm/vm_test.go b/pkg/vm/vm_test.go
index 3856d9d2a..ac9dbe89e 100644
--- a/pkg/vm/vm_test.go
+++ b/pkg/vm/vm_test.go
@@ -920,6 +920,8 @@ func TestOVERbadNoitem(t *testing.T) {
 	vm.estack.PushVal(1)
 	vm.Run()
 	assert.Equal(t, true, vm.state.HasFlag(faultState))
+	assert.Equal(t, 1, vm.estack.Len())
+	assert.Equal(t, makeStackItem(1), vm.estack.Pop().value)
 }
 
 func TestOVERbadNoitems(t *testing.T) {