copy_to_buffer return right away if range empty

cms-sw · Sep 14, 2021 · ffdea77 · ffdea77
1 parent fd2a236
commit ffdea77
Showing 1 changed file with 5 additions and 0 deletions.
diff --git a/RecoLocalTracker/SiPixelClusterizer/plugins/PixelThresholdClusterizer.cc b/RecoLocalTracker/SiPixelClusterizer/plugins/PixelThresholdClusterizer.cc
@@ -222,6 +222,11 @@ void PixelThresholdClusterizer::copy_to_buffer(DigiIterator begin, DigiIterator
     // std::cout << (doMissCalibrate ? "VI from db" : "VI linear") << std::endl;
   }
 #endif
+
+  //avoid undefined behavior
+  if (end <= begin)
+    return;
+
   int electron[end - begin];  // pixel charge in electrons
   memset(electron, 0, (end - begin) * sizeof(int));