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From "Patrick Hunt (JIRA)" <j...@apache.org>
Subject [jira] [Resolved] (ZOOKEEPER-3007) Potential NPE in ReferenceCountedACLCache#deserialize
Date Thu, 26 Apr 2018 22:25:00 GMT

     [ https://issues.apache.org/jira/browse/ZOOKEEPER-3007?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Patrick Hunt resolved ZOOKEEPER-3007.
-------------------------------------
       Resolution: Fixed
    Fix Version/s: 3.5.4
                   3.4.13
                   3.6.0

Issue resolved by pull request 495
[https://github.com/apache/zookeeper/pull/495]

> Potential NPE in ReferenceCountedACLCache#deserialize 
> ------------------------------------------------------
>
>                 Key: ZOOKEEPER-3007
>                 URL: https://issues.apache.org/jira/browse/ZOOKEEPER-3007
>             Project: ZooKeeper
>          Issue Type: Bug
>    Affects Versions: 3.6.0
>            Reporter: lujie
>            Priority: Major
>             Fix For: 3.6.0, 3.4.13, 3.5.4
>
>
> Inspired by ZK-3006 , I develop a simple static analysis tool to find other Potential
NPE like ZK-3006. This bug is found by this tool ,and I have carefully studied it.  But i
am a newbie at here so i may be wrong, hope someone could confirm it and help me improve
this tool.
> h3. Bug describtion:
> callee BinaryInputArchive#startVector will return null:
> {code:java}
> // code placeholder
> public Index startVector(String tag) throws IOException {
>     int len = readInt(tag);
>      if (len == -1) {
>      return null;
> }
> {code}
> and caller ReferenceCountedACLCache#deserialize  call it without null check
> {code:java}
> // code placeholder
> Index j = ia.startVector("acls");
> while (!j.done()) {
>   ACL acl = new ACL();
>   acl.deserialize(ia, "acl");
> }{code}
> but all the other 14 caller of BinaryInputArchive#startVector performs null checker
like:
> {code:java}
> // code placeholder
> Index vidx1 = a_.startVector("acl");
>   if (vidx1!= null)
>      for (; !vidx1.done(); vidx1.incr()){
>      .....
>     }
>    }
> }
> {code}
> so i think we also need add null check in caller ReferenceCountedACLCache#deserialize 
just like other 14 caller
>  



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