linux-kernel - [PATCH] of: detect invalid phandle in overlay

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Message-Id: <1498072916-4664-1-git-send-email-frowand.list@gmail.com>
Date:   Wed, 21 Jun 2017 12:21:56 -0700
From:   frowand.list@...il.com
To:     Rob Herring <robh+dt@...nel.org>
Cc:     devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] of: detect invalid phandle in overlay

From: Frank Rowand <frank.rowand@...y.com>

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@...y.com>
---
 drivers/of/overlay.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/of/overlay.c b/drivers/of/overlay.c
index 7827786718d8..c0e4ee1cd1ba 100644
--- a/drivers/of/overlay.c
+++ b/drivers/of/overlay.c
@@ -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);
-- 
Frank Rowand <frank.rowand@...y.com>