From 5755ec14b9d392a04041a2f5580ca9a63e60be3e Mon Sep 17 00:00:00 2001
From: mmusich <marco.musich@cern.ch>
Date: Sun, 13 Mar 2022 21:46:44 +0100
Subject: [PATCH] prevent variable length array bound evaluates to non-positive
 value

---
 RecoTracker/DeDx/plugins/HLTDeDxFilter.cc | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/RecoTracker/DeDx/plugins/HLTDeDxFilter.cc b/RecoTracker/DeDx/plugins/HLTDeDxFilter.cc
index 2de6eded22f38..bc2e1984175d2 100644
--- a/RecoTracker/DeDx/plugins/HLTDeDxFilter.cc
+++ b/RecoTracker/DeDx/plugins/HLTDeDxFilter.cc
@@ -115,6 +115,11 @@ bool HLTDeDxFilter::hltFilter(edm::Event& iEvent,
 
   bool accept = false;
   int NTracks = 0;
+
+  // early return
+  if (trackCollection.empty())
+    return accept;
+
   //fill local arrays for eta, phi, and pt
   float eta[trackCollection.size()], phi[trackCollection.size()], pt[trackCollection.size()];
   for (unsigned int i = 0; i < trackCollection.size(); i++) {