From e665be1d70931a0117593bc48ad5fe13fa0f5de9 Mon Sep 17 00:00:00 2001
From: Alexander Alekhin <alexander.a.alekhin@gmail.com>
Date: Fri, 9 Jun 2017 00:16:58 +0000
Subject: [PATCH] photo: fix integer overflow

There is no cast to wide integer type:
    std::numeric_limits<ST>::max() * std::numeric_limits<ST>::max()
---
 modules/photo/src/fast_nlmeans_denoising_opencl.hpp | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/modules/photo/src/fast_nlmeans_denoising_opencl.hpp b/modules/photo/src/fast_nlmeans_denoising_opencl.hpp
index f012de507d..216ba6dd62 100644
--- a/modules/photo/src/fast_nlmeans_denoising_opencl.hpp
+++ b/modules/photo/src/fast_nlmeans_denoising_opencl.hpp
@@ -52,8 +52,8 @@ static bool ocl_calcAlmostDist2Weight(UMat & almostDist2Weight,
     FT almostDist2ActualDistMultiplier = (FT)(1 << almostTemplateWindowSizeSqBinShift) / templateWindowSizeSq;
 
     const FT WEIGHT_THRESHOLD = 1e-3f;
-    int maxDist = normType == NORM_L1 ? std::numeric_limits<ST>::max() * cn :
-        std::numeric_limits<ST>::max() * std::numeric_limits<ST>::max() * cn;
+    WT maxDist = normType == NORM_L1 ? (WT)std::numeric_limits<ST>::max() * cn :
+        (WT)std::numeric_limits<ST>::max() * (WT)std::numeric_limits<ST>::max() * cn;
     int almostMaxDist = (int)(maxDist / almostDist2ActualDistMultiplier + 1);
     FT den[4];
     CV_Assert(hn > 0 && hn <= 4);