static void complete_nread_ascii(conn *c) {
    assert(c != NULL);

    item *it = c->item;
    int comm = c->cmd;
    enum store_item_type ret;
    bool is_valid = false;

    pthread_mutex_lock(&c->thread->stats.mutex);
    c->thread->stats.slab_stats[ITEM_clsid(it)].set_cmds++;
    pthread_mutex_unlock(&c->thread->stats.mutex);

    if ((it->it_flags & ITEM_CHUNKED) == 0) {
        if (strncmp(ITEM_data(it) + it->nbytes - 2, "\r\n", 2) == 0) {
            is_valid = true;
        }
    } else {
        char buf[2];
        /* should point to the final item chunk */
        item_chunk *ch = (item_chunk *) c->ritem;
        assert(ch->used != 0);
        /* :( We need to look at the last two bytes. This could span two
         * chunks.
         */
        if (ch->used > 1) {
            buf[0] = ch->data[ch->used - 2];
            buf[1] = ch->data[ch->used - 1];
        } else {
            assert(ch->prev);
            assert(ch->used == 1);
            buf[0] = ch->prev->data[ch->prev->used - 1];
            buf[1] = ch->data[ch->used - 1];
        }
        if (strncmp(buf, "\r\n", 2) == 0) {
            is_valid = true;
        } else {
            assert(1 == 0);
        }
    }

    if (!is_valid) {
        out_string(c, "CLIENT_ERROR bad data chunk");
    } else {
      ret = store_item(it, comm, c);

#ifdef ENABLE_DTRACE
      uint64_t cas = ITEM_get_cas(it);
      switch (c->cmd) {
      case NREAD_ADD:
          MEMCACHED_COMMAND_ADD(c->sfd, ITEM_key(it), it->nkey,
                                (ret == 1) ? it->nbytes : -1, cas);
          break;
      case NREAD_REPLACE:
          MEMCACHED_COMMAND_REPLACE(c->sfd, ITEM_key(it), it->nkey,
                                    (ret == 1) ? it->nbytes : -1, cas);
          break;
      case NREAD_APPEND:
          MEMCACHED_COMMAND_APPEND(c->sfd, ITEM_key(it), it->nkey,
                                   (ret == 1) ? it->nbytes : -1, cas);
          break;
      case NREAD_PREPEND:
          MEMCACHED_COMMAND_PREPEND(c->sfd, ITEM_key(it), it->nkey,
                                    (ret == 1) ? it->nbytes : -1, cas);
          break;
      case NREAD_SET:
          MEMCACHED_COMMAND_SET(c->sfd, ITEM_key(it), it->nkey,
                                (ret == 1) ? it->nbytes : -1, cas);
          break;
      case NREAD_CAS:
          MEMCACHED_COMMAND_CAS(c->sfd, ITEM_key(it), it->nkey, it->nbytes,
                                cas);
          break;
      }
#endif

      switch (ret) {
      case STORED:
          out_string(c, "STORED");
          break;
      case EXISTS:
          out_string(c, "EXISTS");
          break;
      case NOT_FOUND:
          out_string(c, "NOT_FOUND");
          break;
      case NOT_STORED:
          out_string(c, "NOT_STORED");
          break;
      default:
          out_string(c, "SERVER_ERROR Unhandled storage type.");
      }

    }

    item_remove(c->item);       /* release the c->item reference */
    c->item = 0;
}

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.