static uint16_t tsc210x_read(TSC210xState *s)
{
    uint16_t ret = 0x0000;

    if (!s->command)
        fprintf(stderr, "tsc210x_read: SPI underrun!\n");

    switch (s->page) {
    case TSC_DATA_REGISTERS_PAGE:
        ret = tsc2102_data_register_read(s, s->offset);
        if (!s->dav)
            qemu_irq_raise(s->davint);
        break;
    case TSC_CONTROL_REGISTERS_PAGE:
        ret = tsc2102_control_register_read(s, s->offset);
        break;
    case TSC_AUDIO_REGISTERS_PAGE:
        ret = tsc2102_audio_register_read(s, s->offset);
        break;
    default:
        hw_error("tsc210x_read: wrong memory page\n");
    }

    tsc210x_pin_update(s);

    /* Allow sequential reads.  */
    s->offset ++;
    s->state = 0;
    return ret;
}

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.