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vm: fix typo in MEMCPY handling

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This commit is contained in:
Evgenii Stratonikov 2020-08-24 12:52:02 +03:00
parent 931dc6c64f
commit ab4cd8a990
2 changed files with 5 additions and 1 deletions
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2
pkg/vm/vm.go
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@ -659,7 +659,7 @@ func (v *VM) execute(ctx *Context, op opcode.Opcode, parameter []byte) (err erro
panic("invalid destination index")
}
dst := v.estack.Pop().value.(*stackitem.Buffer).Value().([]byte)
if sum := si + n; sum < 0 || sum > len(dst) {
if sum := di + n; sum < 0 || sum > len(dst) {
panic("size is too big")
}
copy(dst[di:], src[si:si+n])

4
pkg/vm/vm_test.go
View file

@ -1344,6 +1344,10 @@ func TestMEMCPY(t *testing.T) {
buf := stackitem.NewBuffer([]byte{0, 1, 2, 3})
runWithArgs(t, prog, stackitem.NewBuffer([]byte{0, 6, 7, 3}), buf, buf, 1, []byte{4, 5, 6, 7}, 2, 2)
})
t.Run("NonZeroDstIndex", func(t *testing.T) {
buf := stackitem.NewBuffer([]byte{0, 1, 2})
runWithArgs(t, prog, stackitem.NewBuffer([]byte{0, 6, 7}), buf, buf, 1, []byte{4, 5, 6, 7}, 2, 2)
})
t.Run("NegativeSize", getTestFuncForVM(prog, nil, stackitem.NewBuffer([]byte{0, 1}), 0, []byte{2}, 0, -1))
t.Run("NegativeSrcIndex", getTestFuncForVM(prog, nil, stackitem.NewBuffer([]byte{0, 1}), 0, []byte{2}, -1, 1))
t.Run("NegativeDstIndex", getTestFuncForVM(prog, nil, stackitem.NewBuffer([]byte{0, 1}), -1, []byte{2}, 0, 1))