static int pci_cirrus_vga_initfn(PCIDevice *dev)
{
     PCICirrusVGAState *d = DO_UPCAST(PCICirrusVGAState, dev, dev);
     CirrusVGAState *s = &d->cirrus_vga;
     PCIDeviceClass *pc = PCI_DEVICE_GET_CLASS(dev);
     int16_t device_id = pc->device_id;

     /* follow real hardware, cirrus card emulated has 4 MB video memory.
       Also accept 8 MB/16 MB for backward compatibility. */
     if (s->vga.vram_size_mb != 4 && s->vga.vram_size_mb != 8 &&
         s->vga.vram_size_mb != 16) {
         error_report("Invalid cirrus_vga ram size '%u'",
                      s->vga.vram_size_mb);
         return -1;
     }
     /* setup VGA */
     vga_common_init(&s->vga, OBJECT(dev), true);
     cirrus_init_common(s, OBJECT(dev), device_id, 1, pci_address_space(dev),
                        pci_address_space_io(dev));
     s->vga.con = graphic_console_init(DEVICE(dev), 0, s->vga.hw_ops, &s->vga);

     /* setup PCI */

    memory_region_init(&s->pci_bar, OBJECT(dev), "cirrus-pci-bar0", 0x2000000);

    /* XXX: add byte swapping apertures */
    memory_region_add_subregion(&s->pci_bar, 0, &s->cirrus_linear_io);
    memory_region_add_subregion(&s->pci_bar, 0x1000000,
                                &s->cirrus_linear_bitblt_io);

     /* setup memory space */
     /* memory #0 LFB */
     /* memory #1 memory-mapped I/O */
     /* XXX: s->vga.vram_size must be a power of two */
     pci_register_bar(&d->dev, 0, PCI_BASE_ADDRESS_MEM_PREFETCH, &s->pci_bar);
     if (device_id == CIRRUS_ID_CLGD5446) {
         pci_register_bar(&d->dev, 1, 0, &s->cirrus_mmio_io);
     }
     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.