From nobody Tue Nov 26 10:37:35 2024 Delivered-To: importer@patchew.org Authentication-Results: mx.zohomail.com; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org Return-Path: Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) by mx.zohomail.com with SMTPS id 1708529701101665.8131093139273; Wed, 21 Feb 2024 07:35:01 -0800 (PST) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1rcoZG-0008Uy-Nn; Wed, 21 Feb 2024 10:31:31 -0500 Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1rcoNs-0000Mc-Dk; Wed, 21 Feb 2024 10:19:44 -0500 Received: from isrv.corpit.ru ([86.62.121.231]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1rcht9-0002TL-Kl; Wed, 21 Feb 2024 03:23:44 -0500 Received: from tsrv.corpit.ru (tsrv.tls.msk.ru [192.168.177.2]) by isrv.corpit.ru (Postfix) with ESMTP id F0AA34F3DD; Wed, 21 Feb 2024 11:21:21 +0300 (MSK) Received: from tls.msk.ru (mjt.wg.tls.msk.ru [192.168.177.130]) by tsrv.corpit.ru (Postfix) with SMTP id B7A16860BC; Wed, 21 Feb 2024 11:21:00 +0300 (MSK) Received: (nullmailer pid 2142081 invoked by uid 1000); Wed, 21 Feb 2024 08:20:58 -0000 From: Michael Tokarev To: qemu-devel@nongnu.org Cc: qemu-stable@nongnu.org, Ira Weiny , Huai-Cheng Kuo , Dave Jiang , Fan Ni , Jonathan Cameron , "Michael S . Tsirkin" , Michael Tokarev Subject: [Stable-8.2.2 31/60] cxl/cdat: Fix header sum value in CDAT checksum Date: Wed, 21 Feb 2024 11:20:19 +0300 Message-Id: <20240221082058.2141850-31-mjt@tls.msk.ru> X-Mailer: git-send-email 2.39.2 In-Reply-To: References: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=86.62.121.231; envelope-from=mjt@tls.msk.ru; helo=isrv.corpit.ru X-Spam_score_int: -68 X-Spam_score: -6.9 X-Spam_bar: ------ X-Spam_report: (-6.9 / 5.0 requ) BAYES_00=-1.9, RCVD_IN_DNSWL_HI=-5, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZM-MESSAGEID: 1708529701722100003 Content-Type: text/plain; charset="utf-8" From: Ira Weiny The addition of the DCD support for CXL type-3 devices extended the CDAT table large enough that the checksum being returned was incorrect.[1] This was because the checksum value was using the header length field rather than each of the 4 bytes of the length field. This was previously not seen because the length of the CDAT data was less than 256 thus resulting in an equivalent checksum value. Properly calculate the checksum for the CDAT header. [1] https://lore.kernel.org/all/20231116-fix-cdat-devm-free-v1-1-b148b40707= d7@intel.com/ Fixes: aba578bdace5 ("hw/cxl/cdat: CXL CDAT Data Object Exchange implementa= tion") Cc: Huai-Cheng Kuo Signed-off-by: Ira Weiny Reviewed-by: Dave Jiang Reviewed-by: Fan Ni Signed-off-by: Jonathan Cameron Message-Id: <20240126120132.24248-5-Jonathan.Cameron@huawei.com> Reviewed-by: Michael S. Tsirkin Signed-off-by: Michael S. Tsirkin (cherry picked from commit 64fdad5e67587e88c2f1d8f294e89403856a4a31) Signed-off-by: Michael Tokarev diff --git a/hw/cxl/cxl-cdat.c b/hw/cxl/cxl-cdat.c index 24829cf242..2fea975671 100644 --- a/hw/cxl/cxl-cdat.c +++ b/hw/cxl/cxl-cdat.c @@ -49,6 +49,7 @@ static void ct3_build_cdat(CDATObject *cdat, Error **errp) g_autofree CDATTableHeader *cdat_header =3D NULL; g_autofree CDATEntry *cdat_st =3D NULL; uint8_t sum =3D 0; + uint8_t *hdr_buf; int ent, i; =20 /* Use default table if fopen =3D=3D NULL */ @@ -95,8 +96,12 @@ static void ct3_build_cdat(CDATObject *cdat, Error **err= p) /* For now, no runtime updates */ cdat_header->sequence =3D 0; cdat_header->length +=3D sizeof(CDATTableHeader); - sum +=3D cdat_header->revision + cdat_header->sequence + - cdat_header->length; + + hdr_buf =3D (uint8_t *)cdat_header; + for (i =3D 0; i < sizeof(*cdat_header); i++) { + sum +=3D hdr_buf[i]; + } + /* Sum of all bytes including checksum must be 0 */ cdat_header->checksum =3D ~sum + 1; =20 --=20 2.39.2