netdev - [PATCH] net: dsa: microchip: lan937x: fix reference count leak in lan937x_mdio

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Date:   Thu, 8 Sep 2022 12:02:26 +0800
From:   Sun Ke <sunke32@...wei.com>
To:     <woojung.huh@...rochip.com>, <UNGLinuxDriver@...rochip.com>,
        <andrew@...n.ch>, <vivien.didelot@...il.com>,
        <f.fainelli@...il.com>, <olteanv@...il.com>, <davem@...emloft.net>,
        <edumazet@...gle.com>, <kuba@...nel.org>, <pabeni@...hat.com>,
        <linux@...linux.org.uk>
CC:     <netdev@...r.kernel.org>, <kernel-janitors@...r.kernel.org>,
        <sunke32@...wei.com>
Subject: [PATCH] net: dsa: microchip: lan937x: fix reference count leak in lan937x_mdio_register()

This node pointer is returned by of_find_compatible_node() with
refcount incremented in this function. of_node_put() on it before
exitting this function.

Fixes: c9cd961c0d43 ("net: dsa: microchip: lan937x: add interrupt support for port phy link")
Signed-off-by: Sun Ke <sunke32@...wei.com>
---
 drivers/net/dsa/microchip/lan937x_main.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/net/dsa/microchip/lan937x_main.c b/drivers/net/dsa/microchip/lan937x_main.c
index 4867aa62dd4c..18ff0b6a92cc 100644
--- a/drivers/net/dsa/microchip/lan937x_main.c
+++ b/drivers/net/dsa/microchip/lan937x_main.c
@@ -238,8 +238,10 @@ static int lan937x_mdio_register(struct ksz_device *dev)
 	ds->slave_mii_bus = bus;
 
 	ret = lan937x_irq_phy_setup(dev);
-	if (ret)
+	if (ret) {
+		of_node_put(mdio_np);
 		return ret;
+	}
 
 	ret = devm_of_mdiobus_register(ds->dev, bus, mdio_np);
 	if (ret) {
-- 
2.31.1