static void process_bin_delete(conn *c) {
    item *it;

    protocol_binary_request_delete* req = binary_get_request(c);

    char* key = binary_get_key(c);
    size_t nkey = c->binary_header.request.keylen;

    assert(c != NULL);

    if (settings.verbose > 1) {
        fprintf(stderr, "Deleting %s\n", key);
    }

    if (settings.detail_enabled) {
        stats_prefix_record_delete(key, nkey);
    }

    it = item_get(key, nkey);
    if (it) {
        uint64_t cas = ntohll(req->message.header.request.cas);
        if (cas == 0 || cas == ITEM_get_cas(it)) {
            MEMCACHED_COMMAND_DELETE(c->sfd, ITEM_key(it), it->nkey);
            item_unlink(it);
            write_bin_response(c, NULL, 0, 0, 0);
        } else {
            write_bin_error(c, PROTOCOL_BINARY_RESPONSE_KEY_EEXISTS, 0);
        }
        item_remove(it);      /* release our reference */
    } else {
        write_bin_error(c, PROTOCOL_BINARY_RESPONSE_KEY_ENOENT, 0);
    }
}

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.