linux-kernel - Re: [PATCH 4/4] of: detect invalid phandle in overlay

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Date:   Fri, 14 Apr 2017 20:59:40 -0700
From:   Frank Rowand <frowand.list@...il.com>
To:     Rob Herring <robh+dt@...nel.org>,
        Stephen Boyd <stephen.boyd@...aro.org>
Cc:     devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 4/4] of: detect invalid phandle in overlay

Adding Stephen.

On 04/14/17 20:55, frowand.list@...il.com wrote:
> 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 ca0b85f5deb1..20ab49d2f7a4 100644
> --- a/drivers/of/overlay.c
> +++ b/drivers/of/overlay.c
> @@ -130,6 +130,10 @@ 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);
>