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cmd/disasm: fix array-out-of-bounds error (#3491)

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This commit is contained in:
Valentin Wüstholz 2017-01-08 01:18:22 +01:00 committed by Felix Lange
parent 17182732f5
commit 0a5450fe04
1 changed files with 8 additions and 4 deletions
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12
cmd/disasm/main.go
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@ -42,15 +42,19 @@ func main() {
for pc := uint64(0); pc < uint64(len(code)); pc++ { for pc := uint64(0); pc < uint64(len(code)); pc++ {
op := vm.OpCode(code[pc]) op := vm.OpCode(code[pc])
fmt.Printf("%-5d %v", pc, op)
switch op { switch op {
case vm.PUSH1, vm.PUSH2, vm.PUSH3, vm.PUSH4, vm.PUSH5, vm.PUSH6, vm.PUSH7, vm.PUSH8, vm.PUSH9, vm.PUSH10, vm.PUSH11, vm.PUSH12, vm.PUSH13, vm.PUSH14, vm.PUSH15, vm.PUSH16, vm.PUSH17, vm.PUSH18, vm.PUSH19, vm.PUSH20, vm.PUSH21, vm.PUSH22, vm.PUSH23, vm.PUSH24, vm.PUSH25, vm.PUSH26, vm.PUSH27, vm.PUSH28, vm.PUSH29, vm.PUSH30, vm.PUSH31, vm.PUSH32: case vm.PUSH1, vm.PUSH2, vm.PUSH3, vm.PUSH4, vm.PUSH5, vm.PUSH6, vm.PUSH7, vm.PUSH8, vm.PUSH9, vm.PUSH10, vm.PUSH11, vm.PUSH12, vm.PUSH13, vm.PUSH14, vm.PUSH15, vm.PUSH16, vm.PUSH17, vm.PUSH18, vm.PUSH19, vm.PUSH20, vm.PUSH21, vm.PUSH22, vm.PUSH23, vm.PUSH24, vm.PUSH25, vm.PUSH26, vm.PUSH27, vm.PUSH28, vm.PUSH29, vm.PUSH30, vm.PUSH31, vm.PUSH32:
a := uint64(op) - uint64(vm.PUSH1) + 1 a := uint64(op) - uint64(vm.PUSH1) + 1
fmt.Printf(" => %x", code[pc+1:pc+1+a]) u := pc + 1 + a
if uint64(len(code)) <= pc || uint64(len(code)) < u {
fmt.Printf("Error: incomplete push instruction at %v\n", pc)
return
}
fmt.Printf("%-5d %v => %x\n", pc, op, code[pc+1:u])
pc += a pc += a
default:
fmt.Printf("%-5d %v\n", pc, op)
} }
fmt.Println()
} }
} }