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

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

[Miaoqian Lin]

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@gmail.com>
---
 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

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

[patchwork-bot+netdevbpf]

Hello:

This patch was applied to netdev/net.git (master)
by Jakub Kicinski <kuba@kernel.org>:

On Tue,  7 Jun 2022 08:11:43 +0400 you wrote:
> 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.
> 
> [...]

Here is the summary with links:
  - net: altera: Fix refcount leak in altera_tse_mdio_create
    https://git.kernel.org/netdev/net/c/11ec18b1d8d9

You are awesome, thank you!
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