Fix a bug of cornerHarris and cornerMinEigenVal.

The bug is a buffer overrun when border type is reflect101.
It is found that gfft crashed with input of size 100x100 on Intel CPU.

modules/ocl/src/opencl/imgproc_calcHarris.cl

@@ -130,22 +130,23 @@ __kernel void calcHarris(__global const float *Dx,__global const float *Dy, __gl
         data[2][i] = dy_data[i] * dy_data[i];
     }
 #else
+    int clamped_col = min(dst_cols, col);
     for(int i=0; i < ksY+1; i++)
     {
         int dx_selected_row;
         int dx_selected_col;
         dx_selected_row = ADDR_H(dx_startY+i, 0, dx_whole_rows);
         dx_selected_row = ADDR_B(dx_startY+i, dx_whole_rows, dx_selected_row);
-        dx_selected_col = ADDR_L(dx_startX+col, 0, dx_whole_cols);
-        dx_selected_col = ADDR_R(dx_startX+col, dx_whole_cols, dx_selected_col);
+        dx_selected_col = ADDR_L(dx_startX+clamped_col, 0, dx_whole_cols);
+        dx_selected_col = ADDR_R(dx_startX+clamped_col, dx_whole_cols, dx_selected_col);
         dx_data[i] = Dx[dx_selected_row * (dx_step>>2) + dx_selected_col];
 
         int dy_selected_row;
         int dy_selected_col;
         dy_selected_row = ADDR_H(dy_startY+i, 0, dy_whole_rows);
         dy_selected_row = ADDR_B(dy_startY+i, dy_whole_rows, dy_selected_row);
-        dy_selected_col = ADDR_L(dy_startX+col, 0, dy_whole_cols);
-        dy_selected_col = ADDR_R(dy_startX+col, dy_whole_cols, dy_selected_col);
+        dy_selected_col = ADDR_L(dy_startX+clamped_col, 0, dy_whole_cols);
+        dy_selected_col = ADDR_R(dy_startX+clamped_col, dy_whole_cols, dy_selected_col);
         dy_data[i] = Dy[dy_selected_row * (dy_step>>2) + dy_selected_col];
 
         data[0][i] = dx_data[i] * dx_data[i];

modules/ocl/src/opencl/imgproc_calcMinEigenVal.cl

@@ -130,22 +130,24 @@ __kernel void calcMinEigenVal(__global const float *Dx,__global const float *Dy,
         data[2][i] = dy_data[i] * dy_data[i];
     }
 #else
+    int clamped_col = min(dst_cols, col);
+
     for(int i=0; i < ksY+1; i++)
     {
         int dx_selected_row;
         int dx_selected_col;
         dx_selected_row = ADDR_H(dx_startY+i, 0, dx_whole_rows);
         dx_selected_row = ADDR_B(dx_startY+i, dx_whole_rows, dx_selected_row);
-        dx_selected_col = ADDR_L(dx_startX+col, 0, dx_whole_cols);
-        dx_selected_col = ADDR_R(dx_startX+col, dx_whole_cols, dx_selected_col);
+        dx_selected_col = ADDR_L(dx_startX+clamped_col, 0, dx_whole_cols);
+        dx_selected_col = ADDR_R(dx_startX+clamped_col, dx_whole_cols, dx_selected_col);
         dx_data[i] = Dx[dx_selected_row * (dx_step>>2) + dx_selected_col];
 
         int dy_selected_row;
         int dy_selected_col;
         dy_selected_row = ADDR_H(dy_startY+i, 0, dy_whole_rows);
         dy_selected_row = ADDR_B(dy_startY+i, dy_whole_rows, dy_selected_row);
-        dy_selected_col = ADDR_L(dy_startX+col, 0, dy_whole_cols);
-        dy_selected_col = ADDR_R(dy_startX+col, dy_whole_cols, dy_selected_col);
+        dy_selected_col = ADDR_L(dy_startX+clamped_col, 0, dy_whole_cols);
+        dy_selected_col = ADDR_R(dy_startX+clamped_col, dy_whole_cols, dy_selected_col);
         dy_data[i] = Dy[dy_selected_row * (dy_step>>2) + dy_selected_col];
 
         data[0][i] = dx_data[i] * dx_data[i];

modules/ocl/test/test_optflow.cpp

@@ -121,7 +121,7 @@ TEST_P(GoodFeaturesToTrack, EmptyCorners)
 
     cv::ocl::GoodFeaturesToTrackDetector_OCL detector(maxCorners, qualityLevel, minDistance);
 
-    cv::ocl::oclMat src(100, 128, CV_8UC1, cv::Scalar::all(0));
+    cv::ocl::oclMat src(100, 100, CV_8UC1, cv::Scalar::all(0));
     cv::ocl::oclMat corners(1, maxCorners, CV_32FC2);
 
     detector(src, corners);