Merge branch 'stable-2.12' into stable-2.13

* stable-2.12:
  Prevent limit of search outbounding max int value
  Fix NullPointerException on computing task name
  Double-check change data in cleaning up task

Change-Id: I60e321692b19b21f043aad3a59af9483b79a089e

gerrit-lucene/src/main/java/com/google/gerrit/lucene/LuceneChangeIndex.java

@@ -322,6 +322,9 @@ public class LuceneChangeIndex implements ChangeIndex {
       IndexSearcher[] searchers = new IndexSearcher[indexes.size()];
       try {
         int realLimit = opts.start() + opts.limit();
+        if (Integer.MAX_VALUE - opts.limit() < opts.start()) {
+          realLimit = Integer.MAX_VALUE;
+        }
         TopFieldDocs[] hits = new TopFieldDocs[indexes.size()];
         for (int i = 0; i < indexes.size(); i++) {
           searchers[i] = indexes.get(i).acquire();