grub_disk_adjust_range (grub_disk_t disk, grub_disk_addr_t *sector,
			grub_off_t *offset, grub_size_t size)
{
  *sector += *offset >> GRUB_DISK_SECTOR_BITS;
  *offset &= GRUB_DISK_SECTOR_SIZE - 1;
/*
  grub_partition_t part;
  for (part = disk->partition; part; part = part->parent)
    {
      grub_disk_addr_t start;
      grub_uint64_t len;

      start = part->start;
      len = part->len;

      if (*sector >= len
	  || len - *sector < ((*offset + size + GRUB_DISK_SECTOR_SIZE - 1)
			      >> GRUB_DISK_SECTOR_BITS))
	return grub_error (GRUB_ERR_OUT_OF_RANGE, "out of partition");

      *sector += start;
    }

  if (disk->total_sectors <= *sector
      || ((*offset + size + GRUB_DISK_SECTOR_SIZE - 1)
	  >> GRUB_DISK_SECTOR_BITS) > disk->total_sectors - *sector)
    return grub_error (GRUB_ERR_OUT_OF_RANGE, "out of disk");
*/
  return GRUB_ERR_NONE;

}

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.