static void cirrus_reset(void *opaque)
{
    CirrusVGAState *s = opaque;

    vga_common_reset(&s->vga);
    unmap_linear_vram(s);
    s->vga.sr[0x06] = 0x0f;
    if (s->device_id == CIRRUS_ID_CLGD5446) {
        /* 4MB 64 bit memory config, always PCI */
        s->vga.sr[0x1F] = 0x2d;		// MemClock
        s->vga.gr[0x18] = 0x0f;             // fastest memory configuration
        s->vga.sr[0x0f] = 0x98;
        s->vga.sr[0x17] = 0x20;
        s->vga.sr[0x15] = 0x04; /* memory size, 3=2MB, 4=4MB */
    } else {
        s->vga.sr[0x1F] = 0x22;		// MemClock
        s->vga.sr[0x0F] = CIRRUS_MEMSIZE_2M;
        s->vga.sr[0x17] = s->bustype;
        s->vga.sr[0x15] = 0x03; /* memory size, 3=2MB, 4=4MB */
    }
    s->vga.cr[0x27] = s->device_id;

    s->cirrus_hidden_dac_lockindex = 5;
    s->cirrus_hidden_dac_data = 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.