linux-kernel - Re: [PATCH V2 2/2] thermal/of: accessing potential uninitialized value

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Date:   Tue, 22 Aug 2023 21:23:40 +0200
From:   "Rafael J. Wysocki" <rafael@...nel.org>
To:     "Peng Fan (OSS)" <peng.fan@....nxp.com>
Cc:     rafael@...nel.org, daniel.lezcano@...aro.org, amitk@...nel.org,
        rui.zhang@...el.com, linux-pm@...r.kernel.org,
        linux-kernel@...r.kernel.org, Peng Fan <peng.fan@....com>
Subject: Re: [PATCH V2 2/2] thermal/of: accessing potential uninitialized value

On Mon, Jul 24, 2023 at 9:12 AM Peng Fan (OSS) <peng.fan@....nxp.com> wrote:
>
> From: Peng Fan <peng.fan@....com>
>
> If of_parse_phandle_with_args returns failure, the cooling_spec.np is
> uninitialized. So move of_node_put below the return value check to avoid
> accessing uninitialized value.
>
> Addresses-Coverity: 25772185 ("Uninitialized pointer read")
> Addresses-Coverity: 25772845 ("Uninitialized pointer read")
> Fixes: 3fd6d6e2b4e8 ("thermal/of: Rework the thermal device tree initialization")
> Signed-off-by: Peng Fan <peng.fan@....com>
> ---
>  drivers/thermal/thermal_of.c | 8 ++++----
>  1 file changed, 4 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/thermal/thermal_of.c b/drivers/thermal/thermal_of.c
> index 330690a3a208..4ca905723429 100644
> --- a/drivers/thermal/thermal_of.c
> +++ b/drivers/thermal/thermal_of.c
> @@ -291,13 +291,13 @@ static int __thermal_of_unbind(struct device_node *map_np, int index, int trip_i
>         ret = of_parse_phandle_with_args(map_np, "cooling-device", "#cooling-cells",
>                                          index, &cooling_spec);
>
> -       of_node_put(cooling_spec.np);
> -
>         if (ret < 0) {
>                 pr_err("Invalid cooling-device entry\n");
>                 return ret;
>         }
>
> +       of_node_put(cooling_spec.np);
> +
>         if (cooling_spec.args_count < 2) {
>                 pr_err("wrong reference to cooling device, missing limits\n");
>                 return -EINVAL;
> @@ -324,13 +324,13 @@ static int __thermal_of_bind(struct device_node *map_np, int index, int trip_id,
>         ret = of_parse_phandle_with_args(map_np, "cooling-device", "#cooling-cells",
>                                          index, &cooling_spec);
>
> -       of_node_put(cooling_spec.np);
> -
>         if (ret < 0) {
>                 pr_err("Invalid cooling-device entry\n");
>                 return ret;
>         }
>
> +       of_node_put(cooling_spec.np);
> +
>         if (cooling_spec.args_count < 2) {
>                 pr_err("wrong reference to cooling device, missing limits\n");
>                 return -EINVAL;
> --

Applied (with some edits in the subject and changelog) as 6.6 material, thanks!