message: Fixed the int size overflow bug of cv::Mat.push_back().
  Changed the type of variable *r* from int to size_t.
  This change makes sure that a valid result of std::max(r + delta,
  (r*3+1)/2) can be passed into the reserve function.
diff: @@ -602,13 +602,13 @@ void Mat::pop_back(size_t nelems)
  void Mat::push_back_(const void* elem)
  {
  - int r = size.p[0];
  + size_t r = size.p[0];
  if( isSubmatrix() || dataend + step.p[0] > datalimit )
  reserve( std::max(r + 1, (r*3+1)/2) );
  size_t esz = elemSize();
  memcpy(data + r*step.p[0], elem, esz);
  - size.p[0] = r + 1;
  + size.p[0] = int(r + 1);
  dataend += step.p[0];
  uint64 tsz = size.p[0];
  for( int i = 1; i < dims; i++ )
  @@ -709,7 +709,8 @@ void Mat::resize(size_t nelems, const Scalar& s)
  void Mat::push_back(const Mat& elems)
  {
  - int r = size.p[0], delta = elems.size.p[0];
  + size_t r = size.p[0];
  + size_t delta = elems.size.p[0];
  if( delta == 0 )
  return;
  if( this == &elems )
  @@ -726,7 +727,7 @@ void Mat::push_back(const Mat& elems)
  size.p[0] = elems.size.p[0];
  bool eq = size == elems.size;
  - size.p[0] = r;
  + size.p[0] = int(r);
  if( !eq )
  CV_Error(CV_StsUnmatchedSizes, "Pushed vector length is not equal to matrix row length");
  if( type() != elems.type() )
  @@ -735,7 +736,7 @@ void Mat::push_back(const Mat& elems)
  if( isSubmatrix() || dataend + step.p[0]*delta > datalimit )
  reserve( std::max(r + delta, (r*3+1)/2) );
  - size.p[0] += delta;
  + size.p[0] += int(delta);
  dataend += step.p[0]*delta;
  //updateContinuityFlag(*this);
  @@ -744,7 +745,7 @@ void Mat::push_back(const Mat& elems)
  memcpy(data + r*step.p[0], elems.data, elems.total()*elems.elemSize());
  else
  {
  - Mat part = rowRange(r, r + delta);
  + Mat part = rowRange(int(r), int(r + delta));
  elems.copyTo(part);
  }
  }
  