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cmd/disasm: fix array-out-of-bounds error.

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This commit is contained in:
Valentin Wüstholz 2017-01-07 13:33:12 +01:00
parent 17182732f5
commit d58486dce5
1 changed files with 8 additions and 4 deletions
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14
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 {
pc += a 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
default:
fmt.Printf("%-5d %v\n", pc, op)
} }
fmt.Println()
} }
} }