png_set_sCAL_s(png_structp png_ptr, png_infop info_ptr,
             int unit, png_charp swidth, png_charp sheight)
{
   png_uint_32 length;

   png_debug1(1, "in %s storage function", "sCAL");

   if (png_ptr == NULL || info_ptr == NULL)
      return;

   info_ptr->scal_unit = (png_byte)unit;

   length = png_strlen(swidth) + 1;
   png_debug1(3, "allocating unit for info (%u bytes)",
      (unsigned int)length);
   info_ptr->scal_s_width = (png_charp)png_malloc_warn(png_ptr, length);
   if (info_ptr->scal_s_width == NULL)
   {
      png_warning(png_ptr,
         "Memory allocation failed while processing sCAL.");
      return;
   }
   png_memcpy(info_ptr->scal_s_width, swidth, (png_size_t)length);

   length = png_strlen(sheight) + 1;
   png_debug1(3, "allocating unit for info (%u bytes)",
      (unsigned int)length);
   info_ptr->scal_s_height = (png_charp)png_malloc_warn(png_ptr, length);
   if (info_ptr->scal_s_height == NULL)
   {
      png_free (png_ptr, info_ptr->scal_s_width);
      info_ptr->scal_s_width = NULL;
      png_warning(png_ptr,
         "Memory allocation failed while processing sCAL.");
      return;
   }
   png_memcpy(info_ptr->scal_s_height, sheight, (png_size_t)length);
   info_ptr->valid |= PNG_INFO_sCAL;
#ifdef PNG_FREE_ME_SUPPORTED
   info_ptr->free_me |= PNG_FREE_SCAL;
#endif
}

The product performs operations on a memory buffer, but it reads from or writes to a memory location outside the buffer's intended boundary. This may result in read or write operations on unexpected memory locations that could be linked to other variables, data structures, or internal program data.