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ASF GitHub Bot commented on ZOOKEEPER-3007: ------------------------------------------- Github user LJ1043041006 commented on a diff in the pull request: https://github.com/apache/zookeeper/pull/495#discussion_r177089527 --- 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 -- should we move 199~122 out of if to avoid endless loop? > 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 > -- This message was sent by Atlassian JIRA (v7.6.3#76005)