[GitHub] [solr] sonatype-lift[bot] commented on a diff in pull request #1762: SOLR-16871: Race condition in `CoordinatorHttpSolrCall` synthetic collection/replica init

[via GitHub]

sonatype-lift[bot] commented on code in PR #1762:
URL: https://github.com/apache/solr/pull/1762#discussion_r1255023253


##########
solr/core/src/java/org/apache/solr/servlet/CoordinatorHttpSolrCall.java:
##########
@@ -111,6 +135,32 @@ public static SolrCore getCore(
           }
 
           addReplica(syntheticCollectionName, solrCall.cores);
+        } else {
+          // still have to ensure that it's active, otherwise 
super.getCoreByCollection will return
+          // null
+          // and then CoordinatorHttpSolrCall will call getCore again hence 
creating a calling loop
+          try {
+            zkStateReader.waitForState(
+                syntheticCollectionName,
+                10,
+                TimeUnit.SECONDS,
+                docCollection -> {
+                  for (Replica nodeNameSyntheticReplica :
+                      
docCollection.getReplicas(solrCall.cores.getZkController().getNodeName())) {

Review Comment:
   <picture><img alt="7% of developers fix this issue" 
src="https://lift.sonatype.com/api/commentimage/fixrate/7/display.svg";></picture>
   
   <b>*NULLPTR_DEREFERENCE:</b>*  `List DocCollection.getReplicas(String)` 
could be null (from the call to `DocCollection.getReplicas(...)` on line 149) 
and is dereferenced.
   
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