[PATCH] net: enetc: Fix use after free issue in fsl_enetc.c

[Siarhei Yasinski]

If ethernet connected to SFP, like this:

&enetc_port0 {
            phy-connection-type = "sgmii";
            sfp = <&sfp0>;
            managed = "in-band-status";
            status = "okay";
};

Then enetc_config_phy returns -ENODEV and the memory containing the mdio interface is freed.
It's better to unregister and free mdio resources.

Signed-off-by: Siarhei Yasinski <siarhei.yasinski at sintecs.eu>

diff --git a/drivers/net/fsl_enetc.c b/drivers/net/fsl_enetc.c
index cd4c2c29a6..835e5bd8bd 100644
--- a/drivers/net/fsl_enetc.c
+++ b/drivers/net/fsl_enetc.c
@@ -22,6 +22,8 @@
 
 #define ENETC_DRIVER_NAME	"enetc_eth"
 
+static int enetc_remove(struct udevice *dev);
+
 /*
  * sets the MAC address in IERB registers, this setting is persistent and
  * carried over to Linux.
@@ -319,6 +321,7 @@ static int enetc_config_phy(struct udevice *dev)
 static int enetc_probe(struct udevice *dev)
 {
 	struct enetc_priv *priv = dev_get_priv(dev);
+	int res;
 
 	if (ofnode_valid(dev_ofnode(dev)) && !ofnode_is_available(dev_ofnode(dev))) {
 		enetc_dbg(dev, "interface disabled\n");
@@ -350,7 +353,10 @@ static int enetc_probe(struct udevice *dev)
 
 	enetc_start_pcs(dev);
 
-	return enetc_config_phy(dev);
+	res = enetc_config_phy(dev);
+	if(res)
+		enetc_remove(dev);
+	return res;
 }
 
 /*