linux-kernel - Re: [PATCH] drivers: base: power: fix memory leak with using debugfs

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Date:   Thu, 2 Feb 2023 15:45:28 +0100
From:   Ulf Hansson <ulf.hansson@...aro.org>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     rafael@...nel.org, Kevin Hilman <khilman@...nel.org>,
        Pavel Machek <pavel@....cz>, Len Brown <len.brown@...el.com>,
        linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] drivers: base: power: fix memory leak with using debugfs_lookup()

On Thu, 2 Feb 2023 at 15:15, Greg Kroah-Hartman
<gregkh@...uxfoundation.org> wrote:
>
> When calling debugfs_lookup() the result must have dput() called on it,
> otherwise the memory will leak over time.  To make things simpler, just
> call debugfs_lookup_and_remove() instead which handles all of the logic
> at
> once.
>
> Cc: "Rafael J. Wysocki" <rafael@...nel.org>
> Cc: Kevin Hilman <khilman@...nel.org>
> Cc: Ulf Hansson <ulf.hansson@...aro.org>
> Cc: Pavel Machek <pavel@....cz>
> Cc: Len Brown <len.brown@...el.com>
> Cc: linux-pm@...r.kernel.org
> Cc: linux-kernel@...r.kernel.org
> Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

Reviewed-by: Ulf Hansson <ulf.hansson@...aro.org>

Kind regards
Uffe

> ---
>  drivers/base/power/domain.c | 5 +----
>  1 file changed, 1 insertion(+), 4 deletions(-)
>
> diff --git a/drivers/base/power/domain.c b/drivers/base/power/domain.c
> index 967bcf9d415e..6097644ebdc5 100644
> --- a/drivers/base/power/domain.c
> +++ b/drivers/base/power/domain.c
> @@ -220,13 +220,10 @@ static void genpd_debug_add(struct generic_pm_domain *genpd);
>
>  static void genpd_debug_remove(struct generic_pm_domain *genpd)
>  {
> -       struct dentry *d;
> -
>         if (!genpd_debugfs_dir)
>                 return;
>
> -       d = debugfs_lookup(genpd->name, genpd_debugfs_dir);
> -       debugfs_remove(d);
> +       debugfs_lookup_and_remove(genpd->name, genpd_debugfs_dir);
>  }
>
>  static void genpd_update_accounting(struct generic_pm_domain *genpd)
> --
> 2.39.1
>