evdns_base_resolve_reverse

API 概述

evdns_base_resolve_reverse 是 libevent 中的一个API。该规属于api pair 类型。该规则是使用 ChatDetector 生成的。

规则描述

提示

The return value of evdns_base_resolve_reverse must be released by calling evdns_cancel_request, with the same object passed as the 2-th argument to evdns_cancel_request

信息

标签：api pair

参数下标：-1

CWE类别：CWE-404

规则代码

import cpp
import semmle.code.cpp.dataflow.new.DataFlow


DataFlow::Node getSource(FunctionCall fc){
  fc.getTarget().hasName("evdns_base_resolve_reverse")
  and result.asExpr() = fc
}

DataFlow::Node getSink(FunctionCall fc){
  fc.getTarget().hasName("evdns_cancel_request")
  and result.asExpr() = fc.getArgument(1)
}

FunctionCall freeTarget(FunctionCall malloc){
  DataFlow::localFlow(getSource(malloc), getSink(result))
}

from FunctionCall fc
where fc.getTarget().hasName("evdns_base_resolve_reverse")
      and not exists(
        FunctionCall free| 
        free = freeTarget(fc)
      )
select fc.getLocation()