xfs_buf_stale(
	struct xfs_buf	*bp)
{
	ASSERT(xfs_buf_islocked(bp));

	bp->b_flags |= XBF_STALE;

	/*
	 * Clear the delwri status so that a delwri queue walker will not
	 * flush this buffer to disk now that it is stale. The delwri queue has
	 * a reference to the buffer, so this is safe to do.
	 */
	bp->b_flags &= ~_XBF_DELWRI_Q;

	atomic_set(&(bp)->b_lru_ref, 0);
	if (!list_empty(&bp->b_lru)) {
		struct xfs_buftarg *btp = bp->b_target;

		spin_lock(&btp->bt_lru_lock);
		if (!list_empty(&bp->b_lru) &&
		    !(bp->b_lru_flags & _XBF_LRU_DISPOSE)) {
			list_del_init(&bp->b_lru);
			btp->bt_lru_nr--;
			atomic_dec(&bp->b_hold);
		}
		spin_unlock(&btp->bt_lru_lock);
	}
	ASSERT(atomic_read(&bp->b_hold) >= 1);
}

The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly.