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drm/mediatek: fix OF sibling-node lookup

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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: 8f83f26891 ("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: Johan Hovold <johan@kernel.org>
Signed-off-by: Rob Herring <robh@kernel.org>
This commit is contained in:
Johan Hovold 2018-08-27 10:21:46 +02:00 committed by Rob Herring
parent 173ee39629
commit ceff2f4dcd
1 changed files with 3 additions and 2 deletions
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5
drivers/gpu/drm/mediatek/mtk_hdmi.c
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@ -1446,8 +1446,7 @@ static int mtk_hdmi_dt_parse_pdata(struct mtk_hdmi *hdmi,
}
/* The CEC module handles HDMI hotplug detection */
cec_np = of_find_compatible_node(np->parent, NULL,
"mediatek,mt8173-cec");
cec_np = of_get_compatible_child(np->parent, "mediatek,mt8173-cec");
if (!cec_np) {
dev_err(dev, "Failed to find CEC node\n");
return -EINVAL;
@ -1457,8 +1456,10 @@ static int mtk_hdmi_dt_parse_pdata(struct mtk_hdmi *hdmi,
if (!cec_pdev) {
dev_err(hdmi->dev, "Waiting for CEC device %pOF\n",
cec_np);
of_node_put(cec_np);
return -EPROBE_DEFER;
}
of_node_put(cec_np);
hdmi->cec_dev = &cec_pdev->dev;
/*