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[109.252.121.216]) by smtp.gmail.com with ESMTPSA id 2adb3069b0e04-53c7bde3287sm270315e87.273.2024.10.31.10.32.12 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 31 Oct 2024 10:32:13 -0700 (PDT) From: George Rurikov To: Robert Moore Cc: George Rurikov , "Rafael J. Wysocki" , Sudeep Holla , linux-acpi@vger.kernel.org, acpica-devel@lists.linux.dev, linux-kernel@vger.kernel.org, lvc-project@linuxtesting.org, stable@vger.kernel.org Subject: [PATCH] ACPICA: Fix dereference in acpi_ev_address_space_dispatch() Date: Thu, 31 Oct 2024 20:31:46 +0300 Message-Id: <20241031173146.1459-1-grurikov@gmail.com> X-Mailer: git-send-email 2.31.1.windows.1 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" When support for PCC Opregion was added, validation of field_obj was missed. Based on the acpi_ev_address_space_dispatch function description, field_obj can be NULL, and also when acpi_ev_address_space_dispatch is called in the acpi_ex_region_read() NULL is passed as field_obj. Found by Linux Verification Center (linuxtesting.org) with SVACE. Fixes: 0acf24ad7e10 ("ACPICA: Add support for PCC Opregion special context = data") Cc: stable@vger.kernel.org Signed-off-by: George Rurikov --- drivers/acpi/acpica/evregion.c | 18 +++++++++++------- 1 file changed, 11 insertions(+), 7 deletions(-) diff --git a/drivers/acpi/acpica/evregion.c b/drivers/acpi/acpica/evregion.c index cf53b9535f18..03e8b6f186af 100644 --- a/drivers/acpi/acpica/evregion.c +++ b/drivers/acpi/acpica/evregion.c @@ -164,13 +164,17 @@ acpi_ev_address_space_dispatch(union acpi_operand_obj= ect *region_obj, } =20 if (region_obj->region.space_id =3D=3D ACPI_ADR_SPACE_PLATFORM_COMM) { - struct acpi_pcc_info *ctx =3D - handler_desc->address_space.context; - - ctx->internal_buffer =3D - field_obj->field.internal_pcc_buffer; - ctx->length =3D (u16)region_obj->region.length; - ctx->subspace_id =3D (u8)region_obj->region.address; + if (field_obj !=3D NULL) { + struct acpi_pcc_info *ctx =3D + handler_desc->address_space.context; + + ctx->internal_buffer =3D + field_obj->field.internal_pcc_buffer; + ctx->length =3D (u16)region_obj->region.length; + ctx->subspace_id =3D (u8)region_obj->region.address; + } else { + return_ACPI_STATUS(AE_ERROR); + } } =20 if (region_obj->region.space_id =3D=3D --=20 2.34.1