static int coroutine_fn iscsi_co_readv(BlockDriverState *bs,
                                       int64_t sector_num, int nb_sectors,
                                       QEMUIOVector *iov)
{
    IscsiLun *iscsilun = bs->opaque;
    struct IscsiTask iTask;
    uint64_t lba;
    uint32_t num_sectors;

    if (!is_request_lun_aligned(sector_num, nb_sectors, iscsilun)) {
        return -EINVAL;
    }

    if (bs->bl.max_transfer_length && nb_sectors > bs->bl.max_transfer_length) {
        error_report("iSCSI Error: Read of %d sectors exceeds max_xfer_len "
                     "of %d sectors", nb_sectors, bs->bl.max_transfer_length);
        return -EINVAL;
    }

    if (iscsilun->lbprz && nb_sectors >= ISCSI_CHECKALLOC_THRES &&
        !iscsi_allocationmap_is_allocated(iscsilun, sector_num, nb_sectors)) {
        int64_t ret;
        int pnum;
        BlockDriverState *file;
        ret = iscsi_co_get_block_status(bs, sector_num, INT_MAX, &pnum, &file);
        if (ret < 0) {
            return ret;
        }
        if (ret & BDRV_BLOCK_ZERO && pnum >= nb_sectors) {
            qemu_iovec_memset(iov, 0, 0x00, iov->size);
            return 0;
        }
    }

    lba = sector_qemu2lun(sector_num, iscsilun);
    num_sectors = sector_qemu2lun(nb_sectors, iscsilun);

    iscsi_co_init_iscsitask(iscsilun, &iTask);
retry:
    if (iscsilun->use_16_for_rw) {
        iTask.task = iscsi_read16_task(iscsilun->iscsi, iscsilun->lun, lba,
                                       num_sectors * iscsilun->block_size,
                                       iscsilun->block_size, 0, 0, 0, 0, 0,
                                       iscsi_co_generic_cb, &iTask);
    } else {
        iTask.task = iscsi_read10_task(iscsilun->iscsi, iscsilun->lun, lba,
                                       num_sectors * iscsilun->block_size,
                                       iscsilun->block_size,
                                       0, 0, 0, 0, 0,
                                       iscsi_co_generic_cb, &iTask);
    }
    if (iTask.task == NULL) {
        return -ENOMEM;
    }
    scsi_task_set_iov_in(iTask.task, (struct scsi_iovec *) iov->iov, iov->niov);

    while (!iTask.complete) {
        iscsi_set_events(iscsilun);
        qemu_coroutine_yield();
    }

    if (iTask.task != NULL) {
        scsi_free_scsi_task(iTask.task);
        iTask.task = NULL;
    }

    if (iTask.do_retry) {
        iTask.complete = 0;
        goto retry;
    }

    if (iTask.status != SCSI_STATUS_GOOD) {
        return iTask.err_code;
    }

    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.