int jas_matrix_resize(jas_matrix_t *matrix, int numrows, int numcols)
int jas_matrix_resize(jas_matrix_t *matrix, jas_matind_t numrows,
  jas_matind_t numcols)
 {
	jas_matind_t size;
	jas_matind_t i;
 
 	size = numrows * numcols;
 	if (size > matrix->datasize_ || numrows > matrix->maxrows_) {
		return -1;
	}

	matrix->numrows_ = numrows;
	matrix->numcols_ = numcols;

	for (i = 0; i < numrows; ++i) {
		matrix->rows_[i] = &matrix->data_[numcols * i];
	}

	return 0;
}

The product performs a calculation that can produce an integer overflow or wraparound when the logic assumes that the resulting value will always be larger than the original value. This occurs when an integer value is incremented to a value that is too large to store in the associated representation. When this occurs, the value may become a very small or negative number.