static int cirrus_get_bpp(VGACommonState *s1)
{
    CirrusVGAState * s = container_of(s1, CirrusVGAState, vga);
    uint32_t ret = 8;

    if ((s->vga.sr[0x07] & 0x01) != 0) {
	/* Cirrus SVGA */
	switch (s->vga.sr[0x07] & CIRRUS_SR7_BPP_MASK) {
	case CIRRUS_SR7_BPP_8:
	    ret = 8;
	    break;
	case CIRRUS_SR7_BPP_16_DOUBLEVCLK:
	    ret = cirrus_get_bpp16_depth(s);
	    break;
	case CIRRUS_SR7_BPP_24:
	    ret = 24;
	    break;
	case CIRRUS_SR7_BPP_16:
	    ret = cirrus_get_bpp16_depth(s);
	    break;
	case CIRRUS_SR7_BPP_32:
	    ret = 32;
	    break;
	default:
#ifdef DEBUG_CIRRUS
	    printf("cirrus: unknown bpp - sr7=%x\n", s->vga.sr[0x7]);
#endif
	    ret = 8;
	    break;
	}
    } else {
	/* VGA */
	ret = 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.