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https://issues.apache.org/jira/browse/ZOOKEEPER-3008?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16453159#comment-16453159
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ASF GitHub Bot commented on ZOOKEEPER-3008:
-------------------------------------------
Github user phunt commented on a diff in the pull request:
https://github.com/apache/zookeeper/pull/496#discussion_r184218439
--- Diff:
src/java/main/org/apache/zookeeper/server/quorum/auth/SaslQuorumAuthLearner.java
---
@@ -94,7 +94,10 @@ public void authenticate(Socket sock, String hostName)
throws IOException {
principalConfig,
QuorumAuth.QUORUM_SERVER_PROTOCOL_NAME,
QuorumAuth.QUORUM_SERVER_SASL_DIGEST, LOG,
"QuorumLearner");
-
+ if (sc == null) {
--- End diff --
Same feedback as #495
1) check the callers and see if it's handled properly. Likely it will be
logged there as well. Verify/report.
2) No need to say exception in an exception. The text of LOG.error line
seems like it would have been a good error string for the exception itself.
3) as previously noted, add a test.
> Potential NPE in SaslQuorumAuthLearner#authenticate and
> SaslQuorumAuthServer#authenticate
> -----------------------------------------------------------------------------------------
>
> Key: ZOOKEEPER-3008
> URL: https://issues.apache.org/jira/browse/ZOOKEEPER-3008
> 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.
> h2. Bug description:
> callee :SecurityUtils#createSaslClient will return null while encounter
> exception
> {code:java}
> // code placeholder
> catch (Exception e) {
> LOG.error("Exception while trying to create SASL client", e);
> return null;
> }
> {code}
> but its caller has no null check just like:
> {code:java}
> // code placeholder
> sc = SecurityUtils.createSaslClient();
> if (sc.hasInitialResponse()) {
> responseToken = createSaslToken(new byte[0], sc, learnerLogin);
> }
> {code}
> I think we should add null check in caller while callee return null
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