xfree86: Take second reference for SavedCursor in xf86CursorSetCursor
The same pointer is kept in CurrentCursor as well, therefore two RefCursor calls are needed. Fixes use-after-free after switching VTs. Closes: https://gitlab.freedesktop.org/xorg/xserver/-/issues/1067
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@ -334,6 +334,9 @@ xf86CursorSetCursor(DeviceIntPtr pDev, ScreenPtr pScreen, CursorPtr pCurs,
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ScreenPriv->HotY = cursor->bits->yhot;
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if (!infoPtr->pScrn->vtSema) {
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cursor = RefCursor(cursor);
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if (ScreenPriv->SavedCursor)
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FreeCursor(ScreenPriv->SavedCursor, None);
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ScreenPriv->SavedCursor = cursor;
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return;
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}
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