static void tsc210x_pin_update(TSC210xState *s)
{
    int64_t expires;
    int pin_state;

    switch (s->pin_func) {
    case 0:
        pin_state = s->pressure;
        break;
    case 1:
        pin_state = !!s->dav;
        break;
    case 2:
    default:
        pin_state = s->pressure && !s->dav;
    }

    if (!s->enabled)
        pin_state = 0;

    if (pin_state != s->irq) {
        s->irq = pin_state;
        qemu_set_irq(s->pint, !s->irq);
    }

    switch (s->nextfunction) {
    case TSC_MODE_XY_SCAN:
    case TSC_MODE_XYZ_SCAN:
        if (!s->pressure)
            return;
        break;

    case TSC_MODE_X:
    case TSC_MODE_Y:
    case TSC_MODE_Z:
        if (!s->pressure)
            return;
        /* Fall through */
    case TSC_MODE_BAT1:
    case TSC_MODE_BAT2:
    case TSC_MODE_AUX:
    case TSC_MODE_TEMP1:
    case TSC_MODE_TEMP2:
        if (s->dav)
            s->enabled = 0;
        break;

    case TSC_MODE_AUX_SCAN:
    case TSC_MODE_PORT_SCAN:
        break;

    case TSC_MODE_NO_SCAN:
    case TSC_MODE_XX_DRV:
    case TSC_MODE_YY_DRV:
    case TSC_MODE_YX_DRV:
    default:
        return;
    }

    if (!s->enabled || s->busy || s->dav)
        return;

    s->busy = 1;
    s->precision = s->nextprecision;
    s->function = s->nextfunction;
    expires = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) + (get_ticks_per_sec() >> 10);
    timer_mod(s->timer, expires);
}

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.