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https://issues.apache.org/jira/browse/ZOOKEEPER-3007?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16415210#comment-16415210
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ASF GitHub Bot commented on ZOOKEEPER-3007:
-------------------------------------------
Github user anmolnar commented on a diff in the pull request:
https://github.com/apache/zookeeper/pull/495#discussion_r177343134
--- Diff:
src/java/main/org/apache/zookeeper/server/ReferenceCountedACLCache.java ---
@@ -109,16 +109,18 @@ public synchronized void deserialize(InputArchive ia)
throws IOException {
}
List<ACL> aclList = new ArrayList<ACL>();
Index j = ia.startVector("acls");
- while (!j.done()) {
- ACL acl = new ACL();
- acl.deserialize(ia, "acl");
- aclList.add(acl);
- j.incr();
+ if (j != null) {
+ while (!j.done()) {
+ ACL acl = new ACL();
+ acl.deserialize(ia, "acl");
+ aclList.add(acl);
+ j.incr();
+ }
+ longKeyMap.put(val, aclList);
--- End diff --
+1
Only the inner while-loop uses the `j` variable, so nothing else should be
inside the check.
> 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
>
> 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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