From d4d95bd70d72fbf7c96d223eff837818a2f30673 Mon Sep 17 00:00:00 2001
From: Maksim Shabunin <maksim.shabunin@gmail.com>
Date: Mon, 16 Mar 2020 15:49:51 +0300
Subject: [PATCH] Fixs several problems found by static analysis

---
 modules/features2d/src/kaze/AKAZEFeatures.cpp | 1 +
 modules/objdetect/src/qrcode.cpp              | 2 ++
 2 files changed, 3 insertions(+)

diff --git a/modules/features2d/src/kaze/AKAZEFeatures.cpp b/modules/features2d/src/kaze/AKAZEFeatures.cpp
index 9b0d8311b0..89cf66bc24 100644
--- a/modules/features2d/src/kaze/AKAZEFeatures.cpp
+++ b/modules/features2d/src/kaze/AKAZEFeatures.cpp
@@ -1323,6 +1323,7 @@ void quantized_counting_sort(const float a[], const int n,
                              const float quantum, const int nkeys,
                              int idx[/*n*/], int cum[/*nkeys + 1*/])
 {
+  CV_Assert(nkeys > 0);
   memset(cum, 0, sizeof(cum[0]) * (nkeys + 1));
 
   // Count up the quantized values
diff --git a/modules/objdetect/src/qrcode.cpp b/modules/objdetect/src/qrcode.cpp
index f99a46c922..4990dfd388 100644
--- a/modules/objdetect/src/qrcode.cpp
+++ b/modules/objdetect/src/qrcode.cpp
@@ -1608,6 +1608,8 @@ bool QRDetectMulti::checkPoints(const vector<Point2f>& quadrangle_points)
             li2++;
         }
     }
+    if (count_w == 0)
+        return false;
 
     double frac = double(count_b) / double(count_w);
     double bottom_bound = 0.76;