Handle empty table when writing NanoAOD

Avoid dereferencing a null pointer when writing an empty table. This was uncovered by the UBSAN checks.
cms-sw · Apr 26, 2022 · f726ecd · f726ecd
1 parent 5b56ea4
commit f726ecd
Showing 1 changed file with 3 additions and 1 deletion.
diff --git a/PhysicsTools/NanoAOD/plugins/TableOutputBranches.h b/PhysicsTools/NanoAOD/plugins/TableOutputBranches.h
@@ -54,7 +54,9 @@ class TableOutputBranches {
     int idx = tab.columnIndex(pair.name);
     if (idx == -1)
       throw cms::Exception("LogicError", "Missing column in input for " + m_baseName + "_" + pair.name);
-    pair.branch->SetAddress(const_cast<T *>(&tab.columnData<T>(idx).front()));  // SetAddress should take a const * !
+    pair.branch->SetAddress(
+        tab.size() == 0 ? static_cast<T *>(nullptr)
+                        : const_cast<T *>(&tab.columnData<T>(idx).front()));  // SetAddress should take a const * !
   }
 };