static void process_command(conn *c, char *command) {

    token_t tokens[MAX_TOKENS];
    size_t ntokens;
    int comm;

    assert(c != NULL);

    MEMCACHED_PROCESS_COMMAND_START(c->sfd, c->rcurr, c->rbytes);

    if (settings.verbose > 1)
        fprintf(stderr, "<%d %s\n", c->sfd, command);

    /*
     * for commands set/add/replace, we build an item and read the data
     * directly into it, then continue in nread_complete().
     */

    c->msgcurr = 0;
    c->msgused = 0;
    c->iovused = 0;
    if (add_msghdr(c) != 0) {
        out_of_memory(c, "SERVER_ERROR out of memory preparing response");
        return;
    }

    ntokens = tokenize_command(command, tokens, MAX_TOKENS);
    if (ntokens >= 3 &&
        ((strcmp(tokens[COMMAND_TOKEN].value, "get") == 0) ||
         (strcmp(tokens[COMMAND_TOKEN].value, "bget") == 0))) {

        process_get_command(c, tokens, ntokens, false);

    } else if ((ntokens == 6 || ntokens == 7) &&
               ((strcmp(tokens[COMMAND_TOKEN].value, "add") == 0 && (comm = NREAD_ADD)) ||
                (strcmp(tokens[COMMAND_TOKEN].value, "set") == 0 && (comm = NREAD_SET)) ||
                (strcmp(tokens[COMMAND_TOKEN].value, "replace") == 0 && (comm = NREAD_REPLACE)) ||
                (strcmp(tokens[COMMAND_TOKEN].value, "prepend") == 0 && (comm = NREAD_PREPEND)) ||
                (strcmp(tokens[COMMAND_TOKEN].value, "append") == 0 && (comm = NREAD_APPEND)) )) {

        process_update_command(c, tokens, ntokens, comm, false);

    } else if ((ntokens == 7 || ntokens == 8) && (strcmp(tokens[COMMAND_TOKEN].value, "cas") == 0 && (comm = NREAD_CAS))) {

        process_update_command(c, tokens, ntokens, comm, true);

    } else if ((ntokens == 4 || ntokens == 5) && (strcmp(tokens[COMMAND_TOKEN].value, "incr") == 0)) {

        process_arithmetic_command(c, tokens, ntokens, 1);

    } else if (ntokens >= 3 && (strcmp(tokens[COMMAND_TOKEN].value, "gets") == 0)) {

        process_get_command(c, tokens, ntokens, true);

    } else if ((ntokens == 4 || ntokens == 5) && (strcmp(tokens[COMMAND_TOKEN].value, "decr") == 0)) {

        process_arithmetic_command(c, tokens, ntokens, 0);

    } else if (ntokens >= 3 && ntokens <= 5 && (strcmp(tokens[COMMAND_TOKEN].value, "delete") == 0)) {

        process_delete_command(c, tokens, ntokens);

    } else if ((ntokens == 4 || ntokens == 5) && (strcmp(tokens[COMMAND_TOKEN].value, "touch") == 0)) {

        process_touch_command(c, tokens, ntokens);

    } else if (ntokens >= 2 && (strcmp(tokens[COMMAND_TOKEN].value, "stats") == 0)) {

        process_stat(c, tokens, ntokens);

    } else if (ntokens >= 2 && ntokens <= 4 && (strcmp(tokens[COMMAND_TOKEN].value, "flush_all") == 0)) {
        time_t exptime = 0;
        rel_time_t new_oldest = 0;

        set_noreply_maybe(c, tokens, ntokens);

        pthread_mutex_lock(&c->thread->stats.mutex);
        c->thread->stats.flush_cmds++;
        pthread_mutex_unlock(&c->thread->stats.mutex);

        if (!settings.flush_enabled) {
            out_string(c, "CLIENT_ERROR flush_all not allowed");
            return;
        }

        if (ntokens != (c->noreply ? 3 : 2)) {
            exptime = strtol(tokens[1].value, NULL, 10);
            if(errno == ERANGE) {
                out_string(c, "CLIENT_ERROR bad command line format");
                return;
            }
        }

        /*
          If exptime is zero realtime() would return zero too, and
          realtime(exptime) - 1 would overflow to the max unsigned
          value.  So we process exptime == 0 the same way we do when
          no delay is given at all.
        */
        if (exptime > 0) {
            new_oldest = realtime(exptime);
        } else { /* exptime == 0 */
            new_oldest = current_time;
        }

        if (settings.use_cas) {
            settings.oldest_live = new_oldest - 1;
            if (settings.oldest_live <= current_time)
                settings.oldest_cas = get_cas_id();
        } else {
            settings.oldest_live = new_oldest;
        }
        out_string(c, "OK");
        return;

    } else if (ntokens == 2 && (strcmp(tokens[COMMAND_TOKEN].value, "version") == 0)) {

        out_string(c, "VERSION " VERSION);

    } else if (ntokens == 2 && (strcmp(tokens[COMMAND_TOKEN].value, "quit") == 0)) {

        conn_set_state(c, conn_closing);

    } else if (ntokens == 2 && (strcmp(tokens[COMMAND_TOKEN].value, "shutdown") == 0)) {

        if (settings.shutdown_command) {
            conn_set_state(c, conn_closing);
            raise(SIGINT);
        } else {
            out_string(c, "ERROR: shutdown not enabled");
        }

    } else if (ntokens > 1 && strcmp(tokens[COMMAND_TOKEN].value, "slabs") == 0) {
        if (ntokens == 5 && strcmp(tokens[COMMAND_TOKEN + 1].value, "reassign") == 0) {
            int src, dst, rv;

            if (settings.slab_reassign == false) {
                out_string(c, "CLIENT_ERROR slab reassignment disabled");
                return;
            }

            src = strtol(tokens[2].value, NULL, 10);
            dst = strtol(tokens[3].value, NULL, 10);

            if (errno == ERANGE) {
                out_string(c, "CLIENT_ERROR bad command line format");
                return;
            }

            rv = slabs_reassign(src, dst);
            switch (rv) {
            case REASSIGN_OK:
                out_string(c, "OK");
                break;
            case REASSIGN_RUNNING:
                out_string(c, "BUSY currently processing reassign request");
                break;
            case REASSIGN_BADCLASS:
                out_string(c, "BADCLASS invalid src or dst class id");
                break;
            case REASSIGN_NOSPARE:
                out_string(c, "NOSPARE source class has no spare pages");
                break;
            case REASSIGN_SRC_DST_SAME:
                out_string(c, "SAME src and dst class are identical");
                break;
            }
            return;
        } else if (ntokens == 4 &&
            (strcmp(tokens[COMMAND_TOKEN + 1].value, "automove") == 0)) {
            process_slabs_automove_command(c, tokens, ntokens);
        } else {
            out_string(c, "ERROR");
        }
    } else if (ntokens > 1 && strcmp(tokens[COMMAND_TOKEN].value, "lru_crawler") == 0) {
        if (ntokens == 4 && strcmp(tokens[COMMAND_TOKEN + 1].value, "crawl") == 0) {
            int rv;
            if (settings.lru_crawler == false) {
                out_string(c, "CLIENT_ERROR lru crawler disabled");
                return;
            }

            rv = lru_crawler_crawl(tokens[2].value, CRAWLER_EXPIRED, NULL, 0);
            switch(rv) {
            case CRAWLER_OK:
                out_string(c, "OK");
                break;
            case CRAWLER_RUNNING:
                out_string(c, "BUSY currently processing crawler request");
                break;
            case CRAWLER_BADCLASS:
                out_string(c, "BADCLASS invalid class id");
                break;
            case CRAWLER_NOTSTARTED:
                out_string(c, "NOTSTARTED no items to crawl");
                break;
            case CRAWLER_ERROR:
                out_string(c, "ERROR an unknown error happened");
                break;
            }
            return;
        } else if (ntokens == 4 && strcmp(tokens[COMMAND_TOKEN + 1].value, "metadump") == 0) {
            if (settings.lru_crawler == false) {
                out_string(c, "CLIENT_ERROR lru crawler disabled");
                return;
            }
            if (!settings.dump_enabled) {
                out_string(c, "ERROR metadump not allowed");
                return;
            }

            int rv = lru_crawler_crawl(tokens[2].value, CRAWLER_METADUMP,
                    c, c->sfd);
            switch(rv) {
                case CRAWLER_OK:
                    out_string(c, "OK");
                    conn_set_state(c, conn_watch);
                    event_del(&c->event);
                    break;
                case CRAWLER_RUNNING:
                    out_string(c, "BUSY currently processing crawler request");
                    break;
                case CRAWLER_BADCLASS:
                    out_string(c, "BADCLASS invalid class id");
                    break;
                case CRAWLER_NOTSTARTED:
                    out_string(c, "NOTSTARTED no items to crawl");
                    break;
                case CRAWLER_ERROR:
                    out_string(c, "ERROR an unknown error happened");
                    break;
            }
            return;
        } else if (ntokens == 4 && strcmp(tokens[COMMAND_TOKEN + 1].value, "tocrawl") == 0) {
            uint32_t tocrawl;
             if (!safe_strtoul(tokens[2].value, &tocrawl)) {
                out_string(c, "CLIENT_ERROR bad command line format");
                return;
            }
            settings.lru_crawler_tocrawl = tocrawl;
            out_string(c, "OK");
            return;
        } else if (ntokens == 4 && strcmp(tokens[COMMAND_TOKEN + 1].value, "sleep") == 0) {
            uint32_t tosleep;
            if (!safe_strtoul(tokens[2].value, &tosleep)) {
                out_string(c, "CLIENT_ERROR bad command line format");
                return;
            }
            if (tosleep > 1000000) {
                out_string(c, "CLIENT_ERROR sleep must be one second or less");
                return;
            }
            settings.lru_crawler_sleep = tosleep;
            out_string(c, "OK");
            return;
        } else if (ntokens == 3) {
            if ((strcmp(tokens[COMMAND_TOKEN + 1].value, "enable") == 0)) {
                if (start_item_crawler_thread() == 0) {
                    out_string(c, "OK");
                } else {
                    out_string(c, "ERROR failed to start lru crawler thread");
                }
            } else if ((strcmp(tokens[COMMAND_TOKEN + 1].value, "disable") == 0)) {
                if (stop_item_crawler_thread() == 0) {
                    out_string(c, "OK");
                } else {
                    out_string(c, "ERROR failed to stop lru crawler thread");
                }
            } else {
                out_string(c, "ERROR");
            }
            return;
        } else {
            out_string(c, "ERROR");
        }
    } else if (ntokens > 1 && strcmp(tokens[COMMAND_TOKEN].value, "watch") == 0) {
        process_watch_command(c, tokens, ntokens);
    } else if ((ntokens == 3 || ntokens == 4) && (strcmp(tokens[COMMAND_TOKEN].value, "cache_memlimit") == 0)) {
        process_memlimit_command(c, tokens, ntokens);
    } else if ((ntokens == 3 || ntokens == 4) && (strcmp(tokens[COMMAND_TOKEN].value, "verbosity") == 0)) {
        process_verbosity_command(c, tokens, ntokens);
    } else if (ntokens >= 3 && strcmp(tokens[COMMAND_TOKEN].value, "lru") == 0) {
        process_lru_command(c, tokens, ntokens);
    } else {
        out_string(c, "ERROR");
    }
    return;
}

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.