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of: detect invalid phandle in overlay

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Overlays are not allowed to modify phandle values of previously existing
nodes because there is no information available to allow fixup up
properties that use the previously existing phandle.

Signed-off-by: Frank Rowand <frank.rowand@sony.com>
Signed-off-by: Rob Herring <robh@kernel.org>
This commit is contained in:
Frank Rowand 2017-06-21 12:21:56 -07:00 committed by Rob Herring
parent 7ace5f4806
commit 7a12f45989
1 changed files with 4 additions and 0 deletions
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4
drivers/of/overlay.c
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@ -132,6 +132,10 @@ static int of_overlay_apply_single_device_node(struct of_overlay *ov,
/* NOTE: Multiple mods of created nodes not supported */
tchild = of_get_child_by_name(target, cname);
if (tchild != NULL) {
/* new overlay phandle value conflicts with existing value */
if (child->phandle)
return -EINVAL;
/* apply overlay recursively */
ret = of_overlay_apply_one(ov, tchild, child);
of_node_put(tchild);