XineramaWarpPointer(ClientPtr client)
{
    WindowPtr dest = NULL;
    int x, y, rc;
    SpritePtr pSprite = PickPointer(client)->spriteInfo->sprite;

    REQUEST(xWarpPointerReq);

    if (stuff->dstWid != None) {
        rc = dixLookupWindow(&dest, stuff->dstWid, client, DixReadAccess);
        if (rc != Success)
            return rc;
    }
    x = pSprite->hotPhys.x;
    y = pSprite->hotPhys.y;

    if (stuff->srcWid != None) {
        int winX, winY;
        XID winID = stuff->srcWid;
        WindowPtr source;

        rc = dixLookupWindow(&source, winID, client, DixReadAccess);
        if (rc != Success)
            return rc;

        winX = source->drawable.x;
        winY = source->drawable.y;
        if (source == screenInfo.screens[0]->root) {
            winX -= screenInfo.screens[0]->x;
            winY -= screenInfo.screens[0]->y;
        }
        if (x < winX + stuff->srcX ||
            y < winY + stuff->srcY ||
            (stuff->srcWidth != 0 &&
             winX + stuff->srcX + (int) stuff->srcWidth < x) ||
            (stuff->srcHeight != 0 &&
             winY + stuff->srcY + (int) stuff->srcHeight < y) ||
            !XineramaPointInWindowIsVisible(source, x, y))
            return Success;
    }
    if (dest) {
        x = dest->drawable.x;
        y = dest->drawable.y;
        if (dest == screenInfo.screens[0]->root) {
            x -= screenInfo.screens[0]->x;
            y -= screenInfo.screens[0]->y;
        }
    }

    x += stuff->dstX;
    y += stuff->dstY;

    if (x < pSprite->physLimits.x1)
        x = pSprite->physLimits.x1;
    else if (x >= pSprite->physLimits.x2)
        x = pSprite->physLimits.x2 - 1;
    if (y < pSprite->physLimits.y1)
        y = pSprite->physLimits.y1;
    else if (y >= pSprite->physLimits.y2)
        y = pSprite->physLimits.y2 - 1;
    if (pSprite->hotShape)
        ConfineToShape(PickPointer(client), pSprite->hotShape, &x, &y);

    XineramaSetCursorPosition(PickPointer(client), x, y, TRUE);

    return Success;
}

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.