From 8334932a26efbf06ce2b408e576654f69d04f15f Mon Sep 17 00:00:00 2001
From: Adam Fowles <adamfowles22@gmail.com>
Date: Mon, 6 Apr 2020 10:49:02 -0400
Subject: [PATCH] Merge pull request #16992 from afowles:fix-forEach-segfault

* Fixed divide by zero error in forEach

* Dedicated assertion for !empty
---
 modules/core/include/opencv2/core/utility.hpp | 1 +
 1 file changed, 1 insertion(+)

diff --git a/modules/core/include/opencv2/core/utility.hpp b/modules/core/include/opencv2/core/utility.hpp
index 86cd2f1fe0..a110d34684 100644
--- a/modules/core/include/opencv2/core/utility.hpp
+++ b/modules/core/include/opencv2/core/utility.hpp
@@ -622,6 +622,7 @@ void Mat::forEach_impl(const Functor& operation) {
         //  or (_Tp&, void*)        <- in case you don't need current idx.
     }
 
+    CV_Assert(!empty());
     CV_Assert(this->total() / this->size[this->dims - 1] <= INT_MAX);
     const int LINES = static_cast<int>(this->total() / this->size[this->dims - 1]);