[PATCH] net: altera: Fix refcount leak in altera_tse_mdio_create

From: Miaoqian Lin
Date: Tue Jun 07 2022 - 00:12:03 EST


Every iteration of for_each_child_of_node() decrements
the reference count of the previous node.
When break from a for_each_child_of_node() loop,
we need to explicitly call of_node_put() on the child node when
not need anymore.
Add missing of_node_put() to avoid refcount leak.

Fixes: bbd2190ce96d ("Altera TSE: Add main and header file for Altera Ethernet Driver")
Signed-off-by: Miaoqian Lin <linmq006@xxxxxxxxx>
---
drivers/net/ethernet/altera/altera_tse_main.c | 6 +++++-
1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/altera/altera_tse_main.c b/drivers/net/ethernet/altera/altera_tse_main.c
index a3816264c35c..8c5828582c21 100644
--- a/drivers/net/ethernet/altera/altera_tse_main.c
+++ b/drivers/net/ethernet/altera/altera_tse_main.c
@@ -163,7 +163,8 @@ static int altera_tse_mdio_create(struct net_device *dev, unsigned int id)
mdio = mdiobus_alloc();
if (mdio == NULL) {
netdev_err(dev, "Error allocating MDIO bus\n");
- return -ENOMEM;
+ ret = -ENOMEM;
+ goto put_node;
}

mdio->name = ALTERA_TSE_RESOURCE_NAME;
@@ -180,6 +181,7 @@ static int altera_tse_mdio_create(struct net_device *dev, unsigned int id)
mdio->id);
goto out_free_mdio;
}
+ of_node_put(mdio_node);

if (netif_msg_drv(priv))
netdev_info(dev, "MDIO bus %s: created\n", mdio->id);
@@ -189,6 +191,8 @@ static int altera_tse_mdio_create(struct net_device *dev, unsigned int id)
out_free_mdio:
mdiobus_free(mdio);
mdio = NULL;
+put_node:
+ of_node_put(mdio_node);
return ret;
}

--
2.25.1