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vm: catch stack underflow on Peek()

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Ethan Buchman
2015-08-08 22:20:19 -04:00
parent 4ee387d077
commit 807bd662b2
1 changed files with 4 additions and 0 deletions
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4
vm/stack.go
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@ -104,6 +104,10 @@ func (st *Stack) Dup(n int) {
// Not an opcode, costs no gas. // Not an opcode, costs no gas.
func (st *Stack) Peek() Word256 { func (st *Stack) Peek() Word256 {
if st.ptr == 0 {
st.setErr(ErrDataStackUnderflow)
return Zero256
}
return st.data[st.ptr-1] return st.data[st.ptr-1]
} }