static void loop_reread_partitions(struct loop_device *lo,
				   struct block_device *bdev)
{
	int rc;

	/*
	 * bd_mutex has been held already in release path, so don't
	 * acquire it if this function is called in such case.
	 *
	 * If the reread partition isn't from release path, lo_refcnt
	 * must be at least one and it can only become zero when the
	 * current holder is released.
	 */
	if (!atomic_read(&lo->lo_refcnt))
		rc = __blkdev_reread_part(bdev);
	else
		rc = blkdev_reread_part(bdev);
	if (rc)
		pr_warn("%s: partition scan of loop%d (%s) failed (rc=%d)\n",
			__func__, lo->lo_number, lo->lo_file_name, rc);
}

The product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory belongs to the code that operates on the new pointer.