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core/vm: check opcode stack before readonly enforcement

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This commit is contained in:
Péter Szilágyi 2017-10-14 15:42:48 +03:00
parent 41b7745529
commit a91e682234
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GPG Key ID: E9AE538CEDF8293D
1 changed files with 10 additions and 13 deletions
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23
core/vm/interpreter.go
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@ -138,10 +138,10 @@ func (in *Interpreter) Run(snapshot int, contract *Contract, input []byte) (ret
pc = uint64(0) // program counter pc = uint64(0) // program counter
cost uint64 cost uint64
// copies used by tracer // copies used by tracer
stackCopy = newstack() // stackCopy needed for Tracer since stack is mutated by 63/64 gas rule stackCopy = newstack() // stackCopy needed for Tracer since stack is mutated by 63/64 gas rule
pcCopy uint64 // needed for the deferred Tracer pcCopy uint64 // needed for the deferred Tracer
gasCopy uint64 // for Tracer to log gas remaining before execution gasCopy uint64 // for Tracer to log gas remaining before execution
logged bool // deferred Tracer should ignore already logged steps logged bool // deferred Tracer should ignore already logged steps
) )
contract.Input = input contract.Input = input
@ -169,22 +169,19 @@ func (in *Interpreter) Run(snapshot int, contract *Contract, input []byte) (ret
} }
} }
// get the operation from the jump table matching the opcode // Get the operation from the jump table matching the opcode and validate the
// stack and make sure there enough stack items available to perform the operation
operation := in.cfg.JumpTable[op] operation := in.cfg.JumpTable[op]
if err := in.enforceRestrictions(op, operation, stack); err != nil {
return nil, err
}
// if the op is invalid abort the process and return an error
if !operation.valid { if !operation.valid {
return nil, fmt.Errorf("invalid opcode 0x%x", int(op)) return nil, fmt.Errorf("invalid opcode 0x%x", int(op))
} }
// validate the stack and make sure there enough stack items available
// to perform the operation
if err := operation.validateStack(stack); err != nil { if err := operation.validateStack(stack); err != nil {
return nil, err return nil, err
} }
// If the operation is valid, enforce and write restrictions
if err := in.enforceRestrictions(op, operation, stack); err != nil {
return nil, err
}
var memorySize uint64 var memorySize uint64
// calculate the new memory size and expand the memory to fit // calculate the new memory size and expand the memory to fit