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core/vm: fill gaps in jump table with opUndefined (#24031)

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This commit is contained in:
Paweł Bylica 2021-12-03 11:04:54 +01:00 committed by GitHub
parent a0f7771962
commit 9331fe28e8
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GPG Key ID: 4AEE18F83AFDEB23
3 changed files with 14 additions and 4 deletions
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4
core/vm/instructions.go
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@ -801,6 +801,10 @@ func opRevert(pc *uint64, interpreter *EVMInterpreter, scope *ScopeContext) ([]b
return ret, ErrExecutionReverted
}
func opUndefined(pc *uint64, interpreter *EVMInterpreter, scope *ScopeContext) ([]byte, error) {
return nil, &ErrInvalidOpCode{opcode: OpCode(scope.Contract.Code[*pc])}
}
func opStop(pc *uint64, interpreter *EVMInterpreter, scope *ScopeContext) ([]byte, error) {
return nil, errStopToken
}

3
core/vm/interpreter.go
View File

@ -193,9 +193,6 @@ func (in *EVMInterpreter) Run(contract *Contract, input []byte, readOnly bool) (
// enough stack items available to perform the operation.
op = contract.GetOp(pc)
operation := in.cfg.JumpTable[op]
if operation == nil {
return nil, &ErrInvalidOpCode{opcode: op}
}
// Validate stack
if sLen := stack.len(); sLen < operation.minStack {
return nil, &ErrStackUnderflow{stackLen: sLen, required: operation.minStack}

11
core/vm/jump_table.go
View File

@ -200,7 +200,7 @@ func newHomesteadInstructionSet() JumpTable {
// newFrontierInstructionSet returns the frontier instructions
// that can be executed during the frontier phase.
func newFrontierInstructionSet() JumpTable {
return JumpTable{
tbl := JumpTable{
STOP: {
execute: opStop,
constantGas: 0,
@ -1002,4 +1002,13 @@ func newFrontierInstructionSet() JumpTable {
maxStack: maxStack(1, 0),
},
}
// Fill all unassigned slots with opUndefined.
for i, entry := range tbl {
if entry == nil {
tbl[i] = &operation{execute: opUndefined, maxStack: maxStack(0, 0)}
}
}
return tbl
}