From 435c97c7a2ca7d88dd1e54b2ce360a754002c130 Mon Sep 17 00:00:00 2001
From: Maksim Shabunin <maksim.shabunin@gmail.com>
Date: Tue, 10 Dec 2019 15:13:38 +0300
Subject: [PATCH] imgproc: add parameter checks in calcHist and calcBackProj

---
 modules/imgproc/src/histogram.cpp        | 14 +++++++++---
 modules/imgproc/test/test_histograms.cpp | 37 ++++++++++++++++++++++++++++++++
 2 files changed, 48 insertions(+), 3 deletions(-)

diff --git a/modules/imgproc/src/histogram.cpp b/modules/imgproc/src/histogram.cpp
index 64a5c61..e66e2e2 100644
--- a/modules/imgproc/src/histogram.cpp
+++ b/modules/imgproc/src/histogram.cpp
@@ -75,8 +75,8 @@ calcHistLookupTables_8u( const Mat& hist, const SparseMat& shist,
             int sz = !issparse ? hist.size[i] : shist.size(i);
             size_t step = !issparse ? hist.step[i] : 1;
 
-            double v_lo = ranges[i][0];
-            double v_hi = ranges[i][1];
+            double v_lo = ranges ? ranges[i][0] : 0;
+            double v_hi = ranges ? ranges[i][1] : 256;
 
             for( j = low; j < high; j++ )
             {
@@ -183,7 +183,7 @@ static void histPrepareImages( const Mat* images, int nimages, const int* channe
         imsize.height = 1;
     }
 
-    if( !ranges )
+    if( !ranges ) // implicit uniform ranges for 8U
     {
         CV_Assert( depth == CV_8U );
 
@@ -951,6 +951,8 @@ void cv::calcHist( const Mat* images, int nimages, const int* channels,
 {
     CV_INSTRUMENT_REGION();
 
+    CV_Assert(images && nimages > 0);
+
     CV_OVX_RUN(
         images && histSize &&
         nimages == 1 && images[0].type() == CV_8UC1 && dims == 1 && _mask.getMat().empty() &&
@@ -1261,6 +1263,8 @@ void cv::calcHist( const Mat* images, int nimages, const int* channels,
 {
     CV_INSTRUMENT_REGION();
 
+    CV_Assert(images && nimages > 0);
+
     Mat mask = _mask.getMat();
     calcHist( images, nimages, channels, mask, hist, dims, histSize,
               ranges, uniform, accumulate, false );
@@ -1608,6 +1612,8 @@ void cv::calcBackProject( const Mat* images, int nimages, const int* channels,
 {
     CV_INSTRUMENT_REGION();
 
+    CV_Assert(images && nimages > 0);
+
     Mat hist = _hist.getMat();
     std::vector<uchar*> ptrs;
     std::vector<int> deltas;
@@ -1777,6 +1783,8 @@ void cv::calcBackProject( const Mat* images, int nimages, const int* channels,
 {
     CV_INSTRUMENT_REGION();
 
+    CV_Assert(images && nimages > 0);
+
     std::vector<uchar*> ptrs;
     std::vector<int> deltas;
     std::vector<double> uniranges;
diff --git a/modules/imgproc/test/test_histograms.cpp b/modules/imgproc/test/test_histograms.cpp
index e9c7575..fdf31fe 100644
--- a/modules/imgproc/test/test_histograms.cpp
+++ b/modules/imgproc/test/test_histograms.cpp
@@ -1957,5 +1957,42 @@ TEST(Imgproc_Hist_Calc, calcHist_regression_11544)
     }
 }
 
+TEST(Imgproc_Hist_Calc, badarg)
+{
+    const int channels[] = {0};
+    float range1[] = {0, 10};
+    float range2[] = {10, 20};
+    const float * ranges[] = {range1, range2};
+    Mat img = cv::Mat::zeros(10, 10, CV_8UC1);
+    Mat imgInt = cv::Mat::zeros(10, 10, CV_32SC1);
+    Mat hist;
+    const int hist_size[] = { 100 };
+    // base run
+    EXPECT_NO_THROW(cv::calcHist(&img, 1, channels, noArray(), hist, 1, hist_size, ranges, true));
+    // bad parameters
+    EXPECT_THROW(cv::calcHist(NULL, 1, channels, noArray(), hist, 1, hist_size, ranges, true), cv::Exception);
+    EXPECT_THROW(cv::calcHist(&img, 0, channels, noArray(), hist, 1, hist_size, ranges, true), cv::Exception);
+    EXPECT_THROW(cv::calcHist(&img, 1, NULL, noArray(), hist, 2, hist_size, ranges, true), cv::Exception);
+    EXPECT_THROW(cv::calcHist(&img, 1, channels, noArray(), noArray(), 1, hist_size, ranges, true), cv::Exception);
+    EXPECT_THROW(cv::calcHist(&img, 1, channels, noArray(), hist, -1, hist_size, ranges, true), cv::Exception);
+    EXPECT_THROW(cv::calcHist(&img, 1, channels, noArray(), hist, 1, NULL, ranges, true), cv::Exception);
+    EXPECT_THROW(cv::calcHist(&imgInt, 1, channels, noArray(), hist, 1, hist_size, NULL, true), cv::Exception);
+    // special case
+    EXPECT_NO_THROW(cv::calcHist(&img, 1, channels, noArray(), hist, 1, hist_size, NULL, true));
+
+    Mat backProj;
+    // base run
+    EXPECT_NO_THROW(cv::calcBackProject(&img, 1, channels, hist, backProj, ranges, 1, true));
+    // bad parameters
+    EXPECT_THROW(cv::calcBackProject(NULL, 1, channels, hist, backProj, ranges, 1, true), cv::Exception);
+    EXPECT_THROW(cv::calcBackProject(&img, 0, channels, hist, backProj, ranges, 1, true), cv::Exception);
+    EXPECT_THROW(cv::calcBackProject(&img, 1, channels, noArray(), backProj, ranges, 1, true), cv::Exception);
+    EXPECT_THROW(cv::calcBackProject(&img, 1, channels, hist, noArray(), ranges, 1, true), cv::Exception);
+    EXPECT_THROW(cv::calcBackProject(&imgInt, 1, channels, hist, backProj, NULL, 1, true), cv::Exception);
+    // special case
+    EXPECT_NO_THROW(cv::calcBackProject(&img, 1, channels, hist, backProj, NULL, 1, true));
+}
+
+
 }} // namespace
 /* End Of File */
-- 
2.7.4