From 0aac17d9f7c7be5bb2efcf821ec939a181012406 Mon Sep 17 00:00:00 2001
From: Maksim Shabunin <maksim.shabunin@gmail.com>
Date: Tue, 24 Mar 2020 12:22:26 +0300
Subject: [PATCH] calib3d: check input values in dls

---
 modules/calib3d/src/dls.cpp | 1 +
 1 file changed, 1 insertion(+)

diff --git a/modules/calib3d/src/dls.cpp b/modules/calib3d/src/dls.cpp
index 93c409b030..a0ff0c3e1e 100644
--- a/modules/calib3d/src/dls.cpp
+++ b/modules/calib3d/src/dls.cpp
@@ -653,6 +653,7 @@ bool dls::is_empty(const cv::Mat * M)
 
 bool dls::positive_eigenvalues(const cv::Mat * eigenvalues)
 {
+    CV_Assert(eigenvalues && !eigenvalues->empty());
     cv::MatConstIterator_<double> it = eigenvalues->begin<double>();
     return *(it) > 0 && *(it+1) > 0 && *(it+2) > 0;
 }