of_get_child_by_name() takes a reference. The rtsn_reset() and
rtsn_change_mode() failure paths jump to out_free_bus and leak
mdio_node.

Add out_put_node to drop it before falling through.

Fixes: b0d3969d2b4d ("net: ethernet: rtsn: Add support for Renesas Ethernet-TSN")
Signed-off-by: Shitalkumar Gandhi <shitalkumar.gandhi@cambiumnetworks.com>
---
 drivers/net/ethernet/renesas/rtsn.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/drivers/net/ethernet/renesas/rtsn.c b/drivers/net/ethernet/renesas/rtsn.c
index 03a2669f0518..c46d991cceb5 100644
--- a/drivers/net/ethernet/renesas/rtsn.c
+++ b/drivers/net/ethernet/renesas/rtsn.c
@@ -797,11 +797,11 @@ static int rtsn_mdio_alloc(struct rtsn_private *priv)
 	/* Enter config mode before registering the MDIO bus */
 	ret = rtsn_reset(priv);
 	if (ret)
-		goto out_free_bus;
+		goto out_put_node;
 
 	ret = rtsn_change_mode(priv, OCR_OPC_CONFIG);
 	if (ret)
-		goto out_free_bus;
+		goto out_put_node;
 
 	rtsn_modify(priv, MPIC, MPIC_PSMCS_MASK | MPIC_PSMHT_MASK,
 		    MPIC_PSMCS_DEFAULT | MPIC_PSMHT_DEFAULT);
@@ -823,7 +823,8 @@ static int rtsn_mdio_alloc(struct rtsn_private *priv)
 	priv->mii = mii;
 
 	return 0;
-
+out_put_node:
+	of_node_put(mdio_node);
 out_free_bus:
 	mdiobus_free(mii);
 	return ret;
-- 
2.25.1

Hi Shitalkumar,

On Mon, 4 May 2026 at 22:05, Shitalkumar Gandhi
<shital.gandhi45@gmail.com> wrote:
> of_get_child_by_name() takes a reference. The rtsn_reset() and
> rtsn_change_mode() failure paths jump to out_free_bus and leak
> mdio_node.
>
> Add out_put_node to drop it before falling through.
>
> Fixes: b0d3969d2b4d ("net: ethernet: rtsn: Add support for Renesas Ethernet-TSN")
> Signed-off-by: Shitalkumar Gandhi <shitalkumar.gandhi@cambiumnetworks.com>

Thanks for your patch!

> --- a/drivers/net/ethernet/renesas/rtsn.c
> +++ b/drivers/net/ethernet/renesas/rtsn.c
> @@ -797,11 +797,11 @@ static int rtsn_mdio_alloc(struct rtsn_private *priv)
>         /* Enter config mode before registering the MDIO bus */
>         ret = rtsn_reset(priv);
>         if (ret)
> -               goto out_free_bus;
> +               goto out_put_node;
>
>         ret = rtsn_change_mode(priv, OCR_OPC_CONFIG);
>         if (ret)
> -               goto out_free_bus;
> +               goto out_put_node;
>
>         rtsn_modify(priv, MPIC, MPIC_PSMCS_MASK | MPIC_PSMHT_MASK,
>                     MPIC_PSMCS_DEFAULT | MPIC_PSMHT_DEFAULT);
> @@ -823,7 +823,8 @@ static int rtsn_mdio_alloc(struct rtsn_private *priv)
>         priv->mii = mii;
>
>         return 0;
> -

Please keep this blank line, as it serves as a clear separation between
success and failure paths.

> +out_put_node:
> +       of_node_put(mdio_node);
>  out_free_bus:
>         mdiobus_free(mii);
>         return ret;

For the logical change:
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>

Gr{oetje,eeting}s,

                        Geert

-- 
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds

of_get_child_by_name() takes a reference. The rtsn_reset() and
rtsn_change_mode() failure paths jump to out_free_bus and leak
mdio_node.

Add out_put_node to drop it before falling through.

Fixes: b0d3969d2b4d ("net: ethernet: rtsn: Add support for Renesas Ethernet-TSN")
Signed-off-by: Shitalkumar Gandhi <shitalkumar.gandhi@cambiumnetworks.com>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
---
Changes in v2:
- Restore blank line between `return 0;` and `out_put_node:` label (Geert)
- Add Reviewed-by: Geert Uytterhoeven

Link to v1: https://lore.kernel.org/netdev/20260504200356.3529873-1-shitalkumar.gandhi@cambiumnetworks.com/

 drivers/net/ethernet/renesas/rtsn.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/renesas/rtsn.c b/drivers/net/ethernet/renesas/rtsn.c
index 03a2669f0518..ee8381b60b8d 100644
--- a/drivers/net/ethernet/renesas/rtsn.c
+++ b/drivers/net/ethernet/renesas/rtsn.c
@@ -797,11 +797,11 @@ static int rtsn_mdio_alloc(struct rtsn_private *priv)
 	/* Enter config mode before registering the MDIO bus */
 	ret = rtsn_reset(priv);
 	if (ret)
-		goto out_free_bus;
+		goto out_put_node;
 
 	ret = rtsn_change_mode(priv, OCR_OPC_CONFIG);
 	if (ret)
-		goto out_free_bus;
+		goto out_put_node;
 
 	rtsn_modify(priv, MPIC, MPIC_PSMCS_MASK | MPIC_PSMHT_MASK,
 		    MPIC_PSMCS_DEFAULT | MPIC_PSMHT_DEFAULT);
@@ -824,6 +824,8 @@ static int rtsn_mdio_alloc(struct rtsn_private *priv)
 
 	return 0;
 
+out_put_node:
+	of_node_put(mdio_node);
 out_free_bus:
 	mdiobus_free(mii);
 	return ret;
-- 
2.25.1

On Tue, May 05, 2026 at 02:28:40PM +0530, Shitalkumar Gandhi wrote:
> of_get_child_by_name() takes a reference. The rtsn_reset() and
> rtsn_change_mode() failure paths jump to out_free_bus and leak
> mdio_node.
> 
> Add out_put_node to drop it before falling through.
> 
> Fixes: b0d3969d2b4d ("net: ethernet: rtsn: Add support for Renesas Ethernet-TSN")
> Signed-off-by: Shitalkumar Gandhi <shitalkumar.gandhi@cambiumnetworks.com>
> Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
> ---
> Changes in v2:
> - Restore blank line between `return 0;` and `out_put_node:` label (Geert)
> - Add Reviewed-by: Geert Uytterhoeven

Please always create a new thread for a new version of the
patch. Without that, the CI system just sees a comment to an existing
patch, and does not run. So this patch has not been through usual
testing, and will be ignored.

	Andrew