static int update_palette16(VGACommonState *s)
{
    int full_update, i;
    uint32_t v, col, *palette;

    full_update = 0;
    palette = s->last_palette;
    for(i = 0; i < 16; i++) {
        v = s->ar[i];
        if (s->ar[VGA_ATC_MODE] & 0x80) {
            v = ((s->ar[VGA_ATC_COLOR_PAGE] & 0xf) << 4) | (v & 0xf);
        } else {
            v = ((s->ar[VGA_ATC_COLOR_PAGE] & 0xc) << 4) | (v & 0x3f);
        }
        v = v * 3;
        col = rgb_to_pixel32(c6_to_8(s->palette[v]),
                             c6_to_8(s->palette[v + 1]),
                             c6_to_8(s->palette[v + 2]));
        if (col != palette[i]) {
            full_update = 1;
            palette[i] = col;
        }
    }
    return full_update;
}

The product contains an assert() or similar statement that can be triggered by an attacker, which leads to an application exit or other behavior that is more severe than necessary.