int qcow2_snapshot_delete(BlockDriverState *bs,
                          const char *snapshot_id,
                          const char *name,
                          Error **errp)
{
    BDRVQcowState *s = bs->opaque;
    QCowSnapshot sn;
    int snapshot_index, ret;

    /* Search the snapshot */
    snapshot_index = find_snapshot_by_id_and_name(bs, snapshot_id, name);
    if (snapshot_index < 0) {
        error_setg(errp, "Can't find the snapshot");
        return -ENOENT;
    }
    sn = s->snapshots[snapshot_index];

    /* Remove it from the snapshot list */
    memmove(s->snapshots + snapshot_index,
            s->snapshots + snapshot_index + 1,
            (s->nb_snapshots - snapshot_index - 1) * sizeof(sn));
    s->nb_snapshots--;
    ret = qcow2_write_snapshots(bs);
    if (ret < 0) {
        error_setg_errno(errp, -ret,
                         "Failed to remove snapshot from snapshot list");
        return ret;
    }

    /*
     * The snapshot is now unused, clean up. If we fail after this point, we
     * won't recover but just leak clusters.
     */
    g_free(sn.id_str);
    g_free(sn.name);

    /*
     * Now decrease the refcounts of clusters referenced by the snapshot and
     * free the L1 table.
     */
    ret = qcow2_update_snapshot_refcount(bs, sn.l1_table_offset,
                                         sn.l1_size, -1);
    if (ret < 0) {
        error_setg_errno(errp, -ret, "Failed to free the cluster and L1 table");
        return ret;
    }
    qcow2_free_clusters(bs, sn.l1_table_offset, sn.l1_size * sizeof(uint64_t),
                        QCOW2_DISCARD_SNAPSHOT);

    /* must update the copied flag on the current cluster offsets */
    ret = qcow2_update_snapshot_refcount(bs, s->l1_table_offset, s->l1_size, 0);
    if (ret < 0) {
        error_setg_errno(errp, -ret,
                         "Failed to update snapshot status in disk");
        return ret;
    }

#ifdef DEBUG_ALLOC
    {
        BdrvCheckResult result = {0};
        qcow2_check_refcounts(bs, &result, 0);
    }
#endif
    return 0;
}

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.