add unit test (#1683)

[bytom/bytom.git] / protocol / vm / vmutil / script.go

diff --git a/protocol/vm/vmutil/script.go b/protocol/vm/vmutil/script.go
index 7061491..1f0d82f 100644 (file)
--- a/protocol/vm/vmutil/script.go
+++ b/protocol/vm/vmutil/script.go
@@ -141,7 +141,7 @@ func GetIssuanceProgramRestrictHeight(program []byte) (int64, error) {
                return 0, err
        }
 
-       if insts[0].IsPushdata() && insts[1].Op == vm.OP_BLOCKHEIGHT && insts[2].Op == vm.OP_GREATERTHAN && insts[3].Op == vm.OP_VERIFY {
+       if len(insts) >= 4 && insts[0].IsPushdata() && insts[1].Op == vm.OP_BLOCKHEIGHT && insts[2].Op == vm.OP_GREATERTHAN && insts[3].Op == vm.OP_VERIFY {
                return vm.AsInt64(insts[0].Data)
        }
        return 0, nil