linux-kernel - [PATCH v2] net: ethernet: bgmac: Fix refcount leak in bcma_mdio_mii

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Message-Id: <20220603133238.44114-1-linmq006@gmail.com>
Date:   Fri,  3 Jun 2022 17:32:38 +0400
From:   Miaoqian Lin <linmq006@...il.com>
To:     Rafał Miłecki <rafal@...ecki.pl>,
        Broadcom Kernel Team <bcm-kernel-feedback-list@...adcom.com>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        Arnd Bergmann <arnd@...db.de>,
        Jon Mason <jon.mason@...adcom.com>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Cc:     linmq006@...il.com
Subject: [PATCH v2] net: ethernet: bgmac: Fix refcount leak in bcma_mdio_mii_register

of_get_child_by_name() returns a node pointer with refcount
incremented, we should use of_node_put() on it when not need anymore.
Add missing of_node_put() to avoid refcount leak.

Fixes: 55954f3bfdac ("net: ethernet: bgmac: move BCMA MDIO Phy code into a separate file")
Signed-off-by: Miaoqian Lin <linmq006@...il.com>
---
changes in v2:
- update Fixes tag.
v1 Link: https://lore.kernel.org/r/20220602133629.35528-1-linmq006@gmail.com
---
 drivers/net/ethernet/broadcom/bgmac-bcma-mdio.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/net/ethernet/broadcom/bgmac-bcma-mdio.c b/drivers/net/ethernet/broadcom/bgmac-bcma-mdio.c
index 086739e4f40a..9b83d5361699 100644
--- a/drivers/net/ethernet/broadcom/bgmac-bcma-mdio.c
+++ b/drivers/net/ethernet/broadcom/bgmac-bcma-mdio.c
@@ -234,6 +234,7 @@ struct mii_bus *bcma_mdio_mii_register(struct bgmac *bgmac)
 	np = of_get_child_by_name(core->dev.of_node, "mdio");
 
 	err = of_mdiobus_register(mii_bus, np);
+	of_node_put(np);
 	if (err) {
 		dev_err(&core->dev, "Registration of mii bus failed\n");
 		goto err_free_bus;
-- 
2.25.1