Re: [PATCH net-next v2 1/4] of: property: skip links without a consumer node

[Saravana Kannan]

On Sun, Aug 16, 2026 at 5:00 PM James Hilliard
<james.hilliard1@xxxxxxxxx> wrote:
>
> Supplier bindings can map a property node to the device node which
> consumes the referenced resource. The remote-endpoint binding uses
> of_graph_get_port_parent(), which can return NULL for a malformed graph
> node without its expected parents.
>
> of_link_property() currently passes that NULL node through to
> fwnode_link_add(), which dereferences the consumer while adding the
> link.
>
> Only create the link when the binding resolved a consumer node. A
> malformed graph property then creates no dependency instead of crashing
> while fw_devlink parses the tree.

Is this a real issue? If it's upstream, should  we fix the DT? If it's
off-tree/down stream, should we care?

If it was reported, can you please add a reported by and link to the report?

>
> Fixes: f7514a663016 ("of: property: fw_devlink: Add support for remote-endpoint")
> Signed-off-by: James Hilliard <james.hilliard1@xxxxxxxxx>
> ---
>  drivers/of/property.c | 4 +++-
>  1 file changed, 3 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/of/property.c b/drivers/of/property.c
> index 72cf12907de0..38c0c7dc428a 100644
> --- a/drivers/of/property.c
> +++ b/drivers/of/property.c
> @@ -1620,7 +1620,9 @@ static int of_link_property(struct device_node *con_np, const char *prop_name)
>
>                         matched = true;
>                         i++;
> -                       of_link_to_phandle(con_dev_np, phandle, s->fwlink_flags);
> +                       if (con_dev_np)
> +                               of_link_to_phandle(con_dev_np, phandle,
> +                                                  s->fwlink_flags);

This shouldn't be a normal case. Can you please add a WARN_ON() for this case?

Assuming we choose to fix this, I'd recommend sending this out as a
separate patch so it's not slowed down by the more complicated patch
series.

-Saravana

>                         of_node_put(phandle);
>                 }
>                 s++;

>
> --
> 2.53.0
>