vm: catch stack underflow on Peek() · 807bd662b2 - tendermint - Gitea: Git with a cup of tea

vm: catch stack underflow on Peek()

pull/126/merge

Ethan Buchman 10 years ago

parent

4ee387d077

commit

807bd662b2

1 changed files with 4 additions and 0 deletions

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vm/stack.goView File
								
					@ -104,6 +104,10 @@ func (st *Stack) Dup(n int) {
				
					// Not an opcode, costs no gas.

					func (st *Stack) Peek() Word256 {
				
						if st.ptr == 0 {
				
							st.setErr(ErrDataStackUnderflow)
				
							return Zero256
				
						}
				
						return st.data[st.ptr-1]
				
					}