static uint64_t cirrus_linear_bitblt_read(void *opaque,
                                          hwaddr addr,
                                          unsigned size)
{
    CirrusVGAState *s = opaque;
    uint32_t ret;

    /* XXX handle bitblt */
    (void)s;
    ret = 0xff;
    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.