void acpi_pcihp_device_plug_cb(ACPIREGS *ar, qemu_irq irq, AcpiPciHpState *s,
                               DeviceState *dev, Error **errp)
{
    PCIDevice *pdev = PCI_DEVICE(dev);
    int slot = PCI_SLOT(pdev->devfn);
    int bsel = acpi_pcihp_get_bsel(pdev->bus);
    if (bsel < 0) {
        error_setg(errp, "Unsupported bus. Bus doesn't have property '"
                   ACPI_PCIHP_PROP_BSEL "' set");
        return;
    }

    /* Don't send event when device is enabled during qemu machine creation:
     * it is present on boot, no hotplug event is necessary. We do send an
     * event when the device is disabled later. */
    if (!dev->hotplugged) {
        return;
    }

    s->acpi_pcihp_pci_status[bsel].up |= (1U << slot);

    ar->gpe.sts[0] |= ACPI_PCI_HOTPLUG_STATUS;
    acpi_update_sci(ar, irq);
}

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.