static int handle_copied(BlockDriverState *bs, uint64_t guest_offset,
    uint64_t *host_offset, uint64_t *bytes, QCowL2Meta **m)
{
    BDRVQcowState *s = bs->opaque;
    int l2_index;
    uint64_t cluster_offset;
    uint64_t *l2_table;
    unsigned int nb_clusters;
    unsigned int keep_clusters;
    int ret, pret;

    trace_qcow2_handle_copied(qemu_coroutine_self(), guest_offset, *host_offset,
                              *bytes);

    assert(*host_offset == 0 ||    offset_into_cluster(s, guest_offset)
                                == offset_into_cluster(s, *host_offset));

    /*
     * Calculate the number of clusters to look for. We stop at L2 table
     * boundaries to keep things simple.
     */
    nb_clusters =
        size_to_clusters(s, offset_into_cluster(s, guest_offset) + *bytes);

    l2_index = offset_to_l2_index(s, guest_offset);
    nb_clusters = MIN(nb_clusters, s->l2_size - l2_index);

    /* Find L2 entry for the first involved cluster */
    ret = get_cluster_table(bs, guest_offset, &l2_table, &l2_index);
    if (ret < 0) {
        return ret;
    }

    cluster_offset = be64_to_cpu(l2_table[l2_index]);

    /* Check how many clusters are already allocated and don't need COW */
    if (qcow2_get_cluster_type(cluster_offset) == QCOW2_CLUSTER_NORMAL
        && (cluster_offset & QCOW_OFLAG_COPIED))
    {
        /* If a specific host_offset is required, check it */
        bool offset_matches =
            (cluster_offset & L2E_OFFSET_MASK) == *host_offset;

        if (*host_offset != 0 && !offset_matches) {
            *bytes = 0;
            ret = 0;
            goto out;
        }

        /* We keep all QCOW_OFLAG_COPIED clusters */
        keep_clusters =
            count_contiguous_clusters(nb_clusters, s->cluster_size,
                                      &l2_table[l2_index],
                                      QCOW_OFLAG_COPIED | QCOW_OFLAG_ZERO);
        assert(keep_clusters <= nb_clusters);

        *bytes = MIN(*bytes,
                 keep_clusters * s->cluster_size
                 - offset_into_cluster(s, guest_offset));

        ret = 1;
    } else {
        ret = 0;
    }

    /* Cleanup */
out:
    pret = qcow2_cache_put(bs, s->l2_table_cache, (void**) &l2_table);
    if (pret < 0) {
        return pret;
    }

    /* Only return a host offset if we actually made progress. Otherwise we
     * would make requirements for handle_alloc() that it can't fulfill */
    if (ret) {
        *host_offset = (cluster_offset & L2E_OFFSET_MASK)
                     + offset_into_cluster(s, guest_offset);
    }

    return ret;
}

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.