static int racls_add_cb(const mbentry_t *mbentry, void *rock)
{
    struct txn **txn = (struct txn **)rock;
    return mboxlist_update_racl(mbentry->name, NULL, mbentry, txn);
}

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.