linux-kernel - Re: [PATCH] ACPICA: Fix memory leak then namespace lookup fails

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Date: Mon, 8 Apr 2024 16:29:18 +0200
From: "Rafael J. Wysocki" <rafael@...nel.org>
To: Armin Wolf <W_Armin@....de>
Cc: robert.moore@...el.com, rafael.j.wysocki@...el.com, lenb@...nel.org, 
	dmantipov@...dex.ru, linux-acpi@...r.kernel.org, acpica-devel@...ts.linux.dev, 
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] ACPICA: Fix memory leak then namespace lookup fails

On Wed, Apr 3, 2024 at 2:47 AM Armin Wolf <W_Armin@....de> wrote:
>
> When acpi_ps_get_next_namepath() fails due to a namespace lookup
> failure, the acpi_parse_object is not freed before returning the
> error code, causing a memory leak.
>
> Fix this by freeing the acpi_parse_object when encountering an
> error.
>
> Tested-by: Dmitry Antipov <dmantipov@...dex.ru>
> Signed-off-by: Armin Wolf <W_Armin@....de>

Because ACPICA is an external project supplying code to the Linux
kernel, the way to change the ACPICA code in the kernel is to submit a
pull request to the upstream ACPICA project on GitHub and once that PR
has been merged, submit a Linux patch corresponding to it including
the Link: tag pointing to the PR in question and the git ID of the
corresponding upstream ACPICA commit.

However, note that upstream ACPICA commits are automatically included
into the Linux kernel source code every time the upstream ACPICA
project makes a release, so it is not necessary to send the
corresponding Linux patches for them unless in the cases when timing
matters.

> ---
>  drivers/acpi/acpica/psargs.c | 8 ++++++++
>  1 file changed, 8 insertions(+)
>
> diff --git a/drivers/acpi/acpica/psargs.c b/drivers/acpi/acpica/psargs.c
> index 422c074ed289..7debfd5ce0d8 100644
> --- a/drivers/acpi/acpica/psargs.c
> +++ b/drivers/acpi/acpica/psargs.c
> @@ -820,6 +820,10 @@ acpi_ps_get_next_arg(struct acpi_walk_state *walk_state,
>                             acpi_ps_get_next_namepath(walk_state, parser_state,
>                                                       arg,
>                                                       ACPI_NOT_METHOD_CALL);
> +                       if (ACPI_FAILURE(status)) {
> +                               acpi_ps_free_op(arg);
> +                               return_ACPI_STATUS(status);
> +                       }
>                 } else {
>                         /* Single complex argument, nothing returned */
>
> @@ -854,6 +858,10 @@ acpi_ps_get_next_arg(struct acpi_walk_state *walk_state,
>                             acpi_ps_get_next_namepath(walk_state, parser_state,
>                                                       arg,
>                                                       ACPI_POSSIBLE_METHOD_CALL);
> +                       if (ACPI_FAILURE(status)) {
> +                               acpi_ps_free_op(arg);
> +                               return_ACPI_STATUS(status);
> +                       }
>
>                         if (arg->common.aml_opcode == AML_INT_METHODCALL_OP) {
>
> --
> 2.39.2
>
>