Re: [PATCH v2 7/9] net: stmmac: dwmac-sun8i: fix OF child-node lookup

[Corentin Labbe]

On Mon, Aug 27, 2018 at 10:21:51AM +0200, Johan Hovold wrote:
> Use the new of_get_compatible_child() helper to lookup the mdio-internal
> child node 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-child) 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 mdio-mux node). Fortunately, this was inadvertently
> balanced by a failure to drop the mdio-mux reference after lookup.
> 
> While at it, also fix the related mdio-internal- and phy-node reference
> leaks.
> 
> Fixes: 634db83b8265 ("net: stmmac: dwmac-sun8i: Handle integrated/external MDIOs")
> Cc: Corentin Labbe <clabbe.montjoie@xxxxxxxxx>
> Cc: Andrew Lunn <andrew@xxxxxxx>
> Cc: Giuseppe Cavallaro <peppe.cavallaro@xxxxxx>
> Cc: Alexandre Torgue <alexandre.torgue@xxxxxx>
> Cc: Jose Abreu <joabreu@xxxxxxxxxxxx>
> Cc: David S. Miller <davem@xxxxxxxxxxxxx>
> Signed-off-by: Johan Hovold <johan@xxxxxxxxxx>

You should have CCed sunxi maintainers 
Maxime Ripard <maxime.ripard@xxxxxxxxxxx> (maintainer:ARM/Allwinner sunXi SoC support)
Chen-Yu Tsai <wens@xxxxxxxx> (maintainer:ARM/Allwinner sunXi SoC support)

Since I am just back from holidays, I will test this patch this week.

Regards