FilterRawEvents(const ClientPtr client, const GrabPtr grab, WindowPtr root)
{
    XIClientPtr client_xi_version;
    int cmp;

    /* device not grabbed -> don't filter */
    if (!grab)
        return FALSE;

    client_xi_version =
        dixLookupPrivate(&client->devPrivates, XIClientPrivateKey);

    cmp = version_compare(client_xi_version->major_version,
                          client_xi_version->minor_version, 2, 0);
    /* XI 2.0: if device is grabbed, skip
       XI 2.1: if device is grabbed by us, skip, we've already delivered */
    if (cmp == 0)
        return TRUE;

    return (grab->window != root) ? FALSE : SameClient(grab, client);
}

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.