linux-kernel - Re: [PATCH] ACPI: Add absent field

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Message-ID: <CAJZ5v0itqy9dXoS4ubq3MPdM2zCBQKah3R5B2SGiJE6auTugBw@mail.gmail.com>
Date: Thu, 9 Oct 2025 17:25:21 +0200
From: "Rafael J. Wysocki" <rafael@...nel.org>
To: Alexey Simakov <bigalex934@...il.com>
Cc: "Rafael J. Wysocki" <rafael@...nel.org>, Robert Moore <robert.moore@...el.com>, 
	Len Brown <lenb@...nel.org>, Sudeep Holla <sudeep.holla@....com>, linux-acpi@...r.kernel.org, 
	acpica-devel@...ts.linux.dev, linux-kernel@...r.kernel.org, 
	lvc-project@...uxtesting.org
Subject: Re: [PATCH] ACPI: Add absent field_obj null check

On Thu, Oct 9, 2025 at 3:57 PM Alexey Simakov <bigalex934@...il.com> wrote:
>
> The acpi_ev_address_space_dispatch function is designed
> in such way that assignning field_obj to NULL is valid case.
>
> Cover the missed execution path with this check.
>
> Found by Linux Verification Center (linuxtesting.org) with SVACE.
>
> Fixes: 0acf24ad7e10 ("ACPICA: Add support for PCC Opregion special context data")
> Signed-off-by: Alexey Simakov <bigalex934@...il.com>

ACPICA changes need to be submitted to the upstream ACPICA project on
GitHub as pull requests (PRs).

Once a given PR has been merged upstream, a corresponding Linux patch
can be sent (with a Link: tag pointing to the original upstream ACPICA
commit), but it is not necessary to do so because released upstream
ACPICA material is automatically included into the ACPICA code in
Linux.

> ---
>  drivers/acpi/acpica/evregion.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/acpi/acpica/evregion.c b/drivers/acpi/acpica/evregion.c
> index fa3475da7ea9..fa01bcd3840d 100644
> --- a/drivers/acpi/acpica/evregion.c
> +++ b/drivers/acpi/acpica/evregion.c
> @@ -163,7 +163,7 @@ acpi_ev_address_space_dispatch(union acpi_operand_object *region_obj,
>                         return_ACPI_STATUS(AE_NOT_EXIST);
>                 }
>
> -               if (region_obj->region.space_id == ACPI_ADR_SPACE_PLATFORM_COMM) {
> +               if (field_obj && region_obj->region.space_id == ACPI_ADR_SPACE_PLATFORM_COMM) {
>                         struct acpi_pcc_info *ctx =
>                             handler_desc->address_space.context;
>
> --
> 2.34.1
>
> Just FYI, this patch was already merged to github ACPICA repository.
> Commit hash with correspond changes at ACPICA repository: f421dd9dd897dfd1e0c015afa90cd0de2464e23c