From: Johan Hovold Date: Mon, 27 Aug 2018 08:21:50 +0000 (+0200) Subject: net: bcmgenet: fix OF child-node lookup X-Git-Tag: rel_imx_4.19.35_1.1.0~8782 X-Git-Url: https://git.somdevices.com/?a=commitdiff_plain;h=90bedf4a7c76ad7fcb002c1ecd1246a34c299af9;p=linux.git net: bcmgenet: fix OF child-node lookup commit d397dbe606120a1ea1b11b0020c3f7a3852da5ac upstream. Use the new of_get_compatible_child() helper to lookup the mdio 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 node of the device being probed). Fixes: aa09677cba42 ("net: bcmgenet: add MDIO routines") Cc: stable # 3.15 Cc: David S. Miller Reviewed-by: Florian Fainelli Signed-off-by: Johan Hovold Signed-off-by: Rob Herring Signed-off-by: Greg Kroah-Hartman --- diff --git a/drivers/net/ethernet/broadcom/genet/bcmmii.c b/drivers/net/ethernet/broadcom/genet/bcmmii.c index 34af5f1569c8..de0e24d912fe 100644 --- a/drivers/net/ethernet/broadcom/genet/bcmmii.c +++ b/drivers/net/ethernet/broadcom/genet/bcmmii.c @@ -342,7 +342,7 @@ static struct device_node *bcmgenet_mii_of_find_mdio(struct bcmgenet_priv *priv) if (!compat) return NULL; - priv->mdio_dn = of_find_compatible_node(dn, NULL, compat); + priv->mdio_dn = of_get_compatible_child(dn, compat); kfree(compat); if (!priv->mdio_dn) { dev_err(kdev, "unable to find MDIO bus node\n");