[PATCH 3/3] net: ravb: Fix error handling in ravb_probe

[Paul Barker]

In ravb_probe(), we were missing a couple of things in the error
handling path:

  * We must unregister the MDIO bus before freeing the corresponding
    struct mii_dev instance to avoid the potential for use-after-free
    bugs.

  * We must free the resources acquired by clk_get_bulk() even if the
    clocks have not yet been enabled.

Fixes: 8ae51b6f324e ("net: ravb: Add Renesas Ethernet RAVB driver")
Signed-off-by: Paul Barker <paul.barker.ct at bp.renesas.com>
---
 drivers/net/ravb.c | 14 ++++++++------
 1 file changed, 8 insertions(+), 6 deletions(-)

diff --git a/drivers/net/ravb.c b/drivers/net/ravb.c
index 6bd94cf6bb1b..83cf6e0d19f4 100644
--- a/drivers/net/ravb.c
+++ b/drivers/net/ravb.c
@@ -591,7 +591,7 @@ static int ravb_probe(struct udevice *dev)
 
 	ret = clk_get_bulk(dev, &eth->clks);
 	if (ret < 0)
-		goto err_mdio_alloc;
+		goto err_clk_get;
 
 	mdiodev = mdio_alloc();
 	if (!mdiodev) {
@@ -613,23 +613,25 @@ static int ravb_probe(struct udevice *dev)
 	/* Bring up PHY */
 	ret = clk_enable_bulk(&eth->clks);
 	if (ret)
-		goto err_mdio_register;
+		goto err_clk_enable;
 
 	ret = ravb_reset(dev);
 	if (ret)
-		goto err_mdio_reset;
+		goto err_clk_enable;
 
 	ret = ravb_phy_config(dev);
 	if (ret)
-		goto err_mdio_reset;
+		goto err_clk_enable;
 
 	return 0;
 
-err_mdio_reset:
-	clk_release_bulk(&eth->clks);
+err_clk_enable:
+	mdio_unregister(mdiodev);
 err_mdio_register:
 	mdio_free(mdiodev);
 err_mdio_alloc:
+	clk_release_bulk(&eth->clks);
+err_clk_get:
 	unmap_physmem(eth->iobase, MAP_NOCACHE);
 	return ret;
 }
-- 
2.43.0