From patchwork Fri Feb 10 20:25:02 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Lukas Wunner X-Patchwork-Id: 13136364 X-Patchwork-Delegate: bhelgaas@google.com Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id D4D7FC05027 for ; Fri, 10 Feb 2023 20:33:20 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233294AbjBJUdU (ORCPT ); Fri, 10 Feb 2023 15:33:20 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:36634 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233731AbjBJUdS (ORCPT ); Fri, 10 Feb 2023 15:33:18 -0500 Received: from mailout3.hostsharing.net (mailout3.hostsharing.net [176.9.242.54]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 48AD923C60; Fri, 10 Feb 2023 12:33:16 -0800 (PST) Received: from h08.hostsharing.net (h08.hostsharing.net [IPv6:2a01:37:1000::53df:5f1c:0]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256 client-signature RSA-PSS (4096 bits) client-digest SHA256) (Client CN "*.hostsharing.net", Issuer "RapidSSL Global TLS RSA4096 SHA256 2022 CA1" (verified OK)) by mailout3.hostsharing.net (Postfix) with ESMTPS id A4AE1101E69A8; Fri, 10 Feb 2023 21:33:14 +0100 (CET) Received: from localhost (unknown [89.246.108.87]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange ECDHE (P-256) server-signature RSA-PSS (4096 bits) server-digest SHA256) (No client certificate requested) by h08.hostsharing.net (Postfix) with ESMTPSA id 64DDB600CA83; Fri, 10 Feb 2023 21:33:14 +0100 (CET) X-Mailbox-Line: From 7f7030bb14ad7c8e0e051319cf473ab3197da5be Mon Sep 17 00:00:00 2001 Message-Id: <7f7030bb14ad7c8e0e051319cf473ab3197da5be.1676043318.git.lukas@wunner.de> In-Reply-To: References: From: Lukas Wunner Date: Fri, 10 Feb 2023 21:25:02 +0100 Subject: [PATCH v3 02/16] cxl/pci: Handle truncated CDAT header To: Bjorn Helgaas , linux-pci@vger.kernel.org Cc: Gregory Price , Ira Weiny , Jonathan Cameron , Dan Williams , Alison Schofield , Vishal Verma , Dave Jiang , "Li, Ming" , Hillf Danton , Ben Widawsky , linuxarm@huawei.com, linux-cxl@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org cxl_cdat_get_length() only checks whether the DOE response size is sufficient for the Table Access response header (1 dword), but not the succeeding CDAT header (1 dword length plus other fields). It thus returns whatever uninitialized memory happens to be on the stack if a truncated DOE response with only 1 dword was received. Fix it. Fixes: c97006046c79 ("cxl/port: Read CDAT table") Reported-by: Ming Li Tested-by: Ira Weiny Signed-off-by: Lukas Wunner Cc: stable@vger.kernel.org # v6.0+ Reviewed-by: Dan Williams Reviewed-by: Jonathan Cameron Reviewed-by: Ming Li --- Changes v2 -> v3: * Newly added patch in v3 drivers/cxl/core/pci.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/cxl/core/pci.c b/drivers/cxl/core/pci.c index d3cf1d9d67d4..11a85b3a9a0b 100644 --- a/drivers/cxl/core/pci.c +++ b/drivers/cxl/core/pci.c @@ -528,7 +528,7 @@ static int cxl_cdat_get_length(struct device *dev, return rc; } wait_for_completion(&t.c); - if (t.task.rv < sizeof(u32)) + if (t.task.rv < 2 * sizeof(u32)) return -EIO; *length = le32_to_cpu(t.response_pl[1]);