Re: [PATCH] pinctrl: imx1-core: fix device_node refcount leak

On Thu, Aug 13, 2026 at 04:39:38PM +0530, Manush Prajwal wrote:
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>
> imx1_pinctrl_dt_is_flat_functions() iterates child and grandchild
> device nodes with for_each_child_of_node() but returns early from
> inside both loops without dropping the reference the iterator holds
> on the current node. Since the function returns a bool rather than a
> node, there is no legitimate reason to keep the reference: call
> of_node_put() on both loop variables before the early returns.
>
> Found by inspection; the sibling helper in pinctrl-imx.c avoids this
> by using for_each_child_of_node_scoped() instead.
>
> Signed-off-by: Manush Prajwal <[email protected]>
> ---
>  drivers/pinctrl/freescale/pinctrl-imx1-core.c | 9 +++++++--
>  1 file changed, 7 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/pinctrl/freescale/pinctrl-imx1-core.c b/drivers/pinctrl/freescale/pinctrl-imx1-core.c
> index b7bd4ef9c0..fa8f6a7e03 100644
> --- a/drivers/pinctrl/freescale/pinctrl-imx1-core.c
> +++ b/drivers/pinctrl/freescale/pinctrl-imx1-core.c
> @@ -551,12 +551,17 @@ static bool imx1_pinctrl_dt_is_flat_functions(struct device_node *np)
>         struct device_node *pinctrl_np;
>
>         for_each_child_of_node(np, function_np) {

use for_each_child_of_node_scoped() to fix it.

Frank

> -               if (of_property_present(function_np, "fsl,pins"))
> +               if (of_property_present(function_np, "fsl,pins")) {
> +                       of_node_put(function_np);
>                         return true;
> +               }
>
>                 for_each_child_of_node(function_np, pinctrl_np) {
> -                       if (of_property_present(pinctrl_np, "fsl,pins"))
> +                       if (of_property_present(pinctrl_np, "fsl,pins")) {
> +                               of_node_put(pinctrl_np);
> +                               of_node_put(function_np);
>                                 return false;
> +                       }
>                 }
>         }
>
> --
> 2.46.2.windows.1
>
>