linux-kernel - Re: [PATCH v2] ACPICA: debugger: check status of acpi_evaluate_object in acpi_db_walk_for

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Date: Tue, 26 Mar 2024 13:07:54 +0100
From: "Rafael J. Wysocki" <rafael@...nel.org>
To: Nikita Kiryushin <kiryushin@...ud.ru>
Cc: Robert Moore <robert.moore@...el.com>, 
	"Rafael J. Wysocki" <rafael.j.wysocki@...el.com>, Len Brown <lenb@...nel.org>, linux-acpi@...r.kernel.org, 
	acpica-devel@...ts.linux.dev, linux-kernel@...r.kernel.org, 
	lvc-project@...uxtesting.org
Subject: Re: [PATCH v2] ACPICA: debugger: check status of acpi_evaluate_object
 in acpi_db_walk_for_fields

On Fri, Mar 22, 2024 at 7:23 PM Nikita Kiryushin <kiryushin@...ud.ru> wrote:
>
> ACPICA commit 9061cd9aa131205657c811a52a9f8325a040c6c9
>
> Errors in acpi_evaluate_object can lead to incorrect state of buffer.
> This can lead to access to data in previously ACPI_FREEd buffer and
> secondary ACPI_FREE to the same buffer later.
>
> Handle errors in acpi_evaluate_object the same way it is done earlier
> with acpi_ns_handle_to_pathname.
>
> Found by Linux Verification Center (linuxtesting.org) with SVACE.
>
> Link: https://github.com/acpica/acpica/commit/9061cd9a
> Fixes: 5fd033288a86 ("ACPICA: debugger: add command to dump all fields of particular subtype")
> Signed-off-by: Nikita Kiryushin <kiryushin@...ud.ru>
> ---
> v2: Add ACPICA project git links for corresponding changes
>  drivers/acpi/acpica/dbnames.c | 8 ++++++--
>  1 file changed, 6 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/acpi/acpica/dbnames.c b/drivers/acpi/acpica/dbnames.c
> index b91155ea9c34..c9131259f717 100644
> --- a/drivers/acpi/acpica/dbnames.c
> +++ b/drivers/acpi/acpica/dbnames.c
> @@ -550,8 +550,12 @@ acpi_db_walk_for_fields(acpi_handle obj_handle,
>         ACPI_FREE(buffer.pointer);
>
>         buffer.length = ACPI_ALLOCATE_LOCAL_BUFFER;
> -       acpi_evaluate_object(obj_handle, NULL, NULL, &buffer);
> -
> +       status = acpi_evaluate_object(obj_handle, NULL, NULL, &buffer);
> +       if (ACPI_FAILURE(status)) {
> +               acpi_os_printf("Could Not evaluate object %p\n",
> +                              obj_handle);
> +               return (AE_OK);
> +       }
>         /*
>          * Since this is a field unit, surround the output in braces
>          */
> --

Applied as 6.10 material, thanks!