• Johan Hovold's avatar
    drm/mediatek: fix OF sibling-node lookup · ceff2f4d
    Johan Hovold authored
    Use the new of_get_compatible_child() helper to lookup the sibling
    instead of using of_find_compatible_node(), which searches the entire
    tree from a given start node and thus can return an unrelated (i.e.
    non-sibling) node.
    
    This also addresses a potential use-after-free (e.g. after probe
    deferral) as the tree-wide helper drops a reference to its first
    argument (i.e. the parent device node).
    
    While at it, also fix the related cec-node reference leak.
    
    Fixes: 8f83f268 ("drm/mediatek: Add HDMI support")
    Cc: stable <stable@vger.kernel.org>     # 4.8
    Cc: Junzhi Zhao <junzhi.zhao@mediatek.com>
    Cc: Philipp Zabel <p.zabel@pengutronix.de>
    Cc: CK Hu <ck.hu@mediatek.com>
    Cc: David Airlie <airlied@linux.ie>
    Signed-off-by: default avatarJohan Hovold <johan@kernel.org>
    Signed-off-by: default avatarRob Herring <robh@kernel.org>
    ceff2f4d
mtk_hdmi.c 45.1 KB