From patchwork Mon Oct 2 13:46:29 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Andy Shevchenko X-Patchwork-Id: 13406249 Received: from lindbergh.monkeyblade.net (lindbergh.monkeyblade.net [23.128.96.19]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id DC4CC2106 for ; Mon, 2 Oct 2023 13:46:36 +0000 (UTC) Received: from mgamail.intel.com (mgamail.intel.com [192.55.52.43]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 1786DB0; Mon, 2 Oct 2023 06:46:35 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1696254395; x=1727790395; h=from:to:cc:subject:date:message-id:mime-version: content-transfer-encoding; bh=AwCB0JAqzDDtRO3CENNhM7InAKHdngeC3934G7S/Ok0=; b=XFj33XhlDvoY2MNL2MT37zWTqqrAJ49CwpC+5A3SZGNqP9FwMz/chY3A WkabLVuK81xfVDgrqR7lFJ/gTva31d4vRy12pWLMLBI6pBtOpYdh1tza3 IF7mRCYkYqNg+fbJ9dU3Bnl5mdp2E9f0f/rzfEOf8SG5puCuCAo/bphIV DiNlzRHibxAxlFfpkJb+yXFt07QnShctrUMxWWJED53NaMq6Aym6ZbLSV o8T78a28QtWFEeW4+UzHhic4QoeXKnXL19V6E3isf98Kak/B/BTQGb0ls Din0SWfeLOkKd37tBgbfTFMx8apSa8ES92WxO716ck6miFACT3zkYTooD g==; X-IronPort-AV: E=McAfee;i="6600,9927,10851"; a="468919050" X-IronPort-AV: E=Sophos;i="6.03,194,1694761200"; d="scan'208";a="468919050" Received: from fmsmga001.fm.intel.com ([10.253.24.23]) by fmsmga105.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 02 Oct 2023 06:46:34 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=McAfee;i="6600,9927,10851"; a="894138443" X-IronPort-AV: E=Sophos;i="6.03,194,1694761200"; d="scan'208";a="894138443" Received: from black.fi.intel.com ([10.237.72.28]) by fmsmga001.fm.intel.com with ESMTP; 02 Oct 2023 06:45:12 -0700 Received: by black.fi.intel.com (Postfix, from userid 1003) id B84ED1A7; Mon, 2 Oct 2023 16:46:31 +0300 (EEST) From: Andy Shevchenko To: Andy Shevchenko , linux-acpi@vger.kernel.org, linux-kernel@vger.kernel.org Cc: "Rafael J. Wysocki" , Len Brown Subject: [PATCH v1 1/2] ACPI: property: Allow _DSD buffer data only for byte accessors Date: Mon, 2 Oct 2023 16:46:29 +0300 Message-Id: <20231002134630.2601294-1-andriy.shevchenko@linux.intel.com> X-Mailer: git-send-email 2.40.0.1.gaa8946217a0b Precedence: bulk X-Mailing-List: linux-acpi@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Spam-Status: No, score=-2.0 required=5.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_EF,RCVD_IN_DNSWL_BLOCKED, SPF_HELO_NONE,SPF_NONE autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net In accordance with ACPI specificication and _DSD data buffer representation the data there is an array of bytes. Hence, accessing it with something longer will create a sparse data which is against of how device property APIs work in general and also not defined in the ACPI specification (see [1]). Fix the code to emit an error if non-byte accessor is used to retrieve _DSD buffer data. Fixes: 369af6bf2c28 ("ACPI: property: Read buffer properties as integers") Link: https://uefi.org/specs/ACPI/6.5/19_ASL_Reference.html#buffer-declare-buffer-object [1] Signed-off-by: Andy Shevchenko --- drivers/acpi/property.c | 18 +++++++++--------- 1 file changed, 9 insertions(+), 9 deletions(-) diff --git a/drivers/acpi/property.c b/drivers/acpi/property.c index 413e4fcadcaf..06550d8c619d 100644 --- a/drivers/acpi/property.c +++ b/drivers/acpi/property.c @@ -1102,25 +1102,25 @@ static int acpi_data_prop_read(const struct acpi_device_data *data, switch (proptype) { case DEV_PROP_STRING: break; - case DEV_PROP_U8 ... DEV_PROP_U64: + default: if (obj->type == ACPI_TYPE_BUFFER) { if (nval > obj->buffer.length) return -EOVERFLOW; - break; + } else { + if (nval > obj->package.count) + return -EOVERFLOW; } - fallthrough; - default: - if (nval > obj->package.count) - return -EOVERFLOW; break; } if (nval == 0) return -EINVAL; - if (obj->type != ACPI_TYPE_BUFFER) - items = obj->package.elements; - else + if (obj->type == ACPI_TYPE_BUFFER) { + if (proptype != DEV_PROP_U8) + return -EPROTO; items = obj; + } else + items = obj->package.elements; switch (proptype) { case DEV_PROP_U8: