static void handle_ti(ESPState *s)
{
    uint32_t dmalen, minlen;

    if (s->dma && !s->dma_enabled) {
        s->dma_cb = handle_ti;
        return;
    }

    dmalen = s->rregs[ESP_TCLO];
    dmalen |= s->rregs[ESP_TCMID] << 8;
    dmalen |= s->rregs[ESP_TCHI] << 16;
    if (dmalen==0) {
      dmalen=0x10000;
    }
    s->dma_counter = dmalen;

    if (s->do_cmd)
        minlen = (dmalen < 32) ? dmalen : 32;
    else if (s->ti_size < 0)
        minlen = (dmalen < -s->ti_size) ? dmalen : -s->ti_size;
    else
        minlen = (dmalen < s->ti_size) ? dmalen : s->ti_size;
    trace_esp_handle_ti(minlen);
    if (s->dma) {
        s->dma_left = minlen;
        s->rregs[ESP_RSTAT] &= ~STAT_TC;
        esp_do_dma(s);
    } else if (s->do_cmd) {
        trace_esp_handle_ti_cmd(s->cmdlen);
        s->ti_size = 0;
        s->cmdlen = 0;
        s->do_cmd = 0;
        do_cmd(s, s->cmdbuf);
        return;
    }
}

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.