From patchwork Mon Mar 22 16:02:49 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Arnd Bergmann X-Patchwork-Id: 12155391 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-19.2 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 04D15C433E9 for ; Mon, 22 Mar 2021 16:07:52 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id E5929619B4 for ; Mon, 22 Mar 2021 16:07:51 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232010AbhCVQGo (ORCPT ); Mon, 22 Mar 2021 12:06:44 -0400 Received: from mail.kernel.org ([198.145.29.99]:53560 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231776AbhCVQFq (ORCPT ); Mon, 22 Mar 2021 12:05:46 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id 49D21619CF; Mon, 22 Mar 2021 16:05:37 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1616429143; bh=ppc9fZupOrjA6hpvzPGCige1HMZi82rKq0OzuPiwp30=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=KfNQhB8I6TCilI9rWZIUvrD60VxxXK7zzzf2CzYQVcPCX4dTFC+5vrq57/HXue9eN 7bPBi+K09Uuo8FgLHJN5cLADDDnPtd+D6sEhJhO/VLvKBoLaRa1BESfKHtMpZuvnwh D3Vc4uZU9Dcg74j9eeiZa4qkcbeOz2ZvcezhMcicUmJ4FzCGExiFKR4ER32CvaOaWV akMTcdJNfGrFGH5JvGZ7qns0oNxpRTzGH0qZ76EqyoQfhjLJvxqyHurET1PBvf6svb dBMESSwDo3iJsmPDGBQ1mVtfw03/ahNqDciEznfWOfvZZJNzU8YYxi4I1doMFPdTRo oo8eGNoKcMUqQ== From: Arnd Bergmann To: linux-kernel@vger.kernel.org, Martin Sebor , Jani Nikula , Joonas Lahtinen , Rodrigo Vivi , David Airlie , Daniel Vetter Cc: Arnd Bergmann , x86@kernel.org, Ning Sun , Kalle Valo , Simon Kelley , James Smart , "James E.J. Bottomley" , Anders Larsen , Tejun Heo , Serge Hallyn , Imre Deak , linux-arm-kernel@lists.infradead.org, tboot-devel@lists.sourceforge.net, intel-gfx@lists.freedesktop.org, dri-devel@lists.freedesktop.org, ath11k@lists.infradead.org, linux-wireless@vger.kernel.org, netdev@vger.kernel.org, linux-scsi@vger.kernel.org, cgroups@vger.kernel.org, linux-security-module@vger.kernel.org, =?utf-8?b?VmlsbGUgU3lyasOkbMOk?= , Manasi Navare , Uma Shankar , Ankit Nautiyal , Gwan-gyeong Mun , Animesh Manna , Sean Paul Subject: [PATCH 11/11] [RFC] drm/i915/dp: fix array overflow warning Date: Mon, 22 Mar 2021 17:02:49 +0100 Message-Id: <20210322160253.4032422-12-arnd@kernel.org> X-Mailer: git-send-email 2.29.2 In-Reply-To: <20210322160253.4032422-1-arnd@kernel.org> References: <20210322160253.4032422-1-arnd@kernel.org> MIME-Version: 1.0 Precedence: bulk List-ID: From: Arnd Bergmann gcc-11 warns that intel_dp_check_mst_status() has a local array of fourteen bytes and passes the last four bytes into a function that expects a six-byte array: drivers/gpu/drm/i915/display/intel_dp.c: In function ‘intel_dp_check_mst_status’: drivers/gpu/drm/i915/display/intel_dp.c:4556:22: error: ‘drm_dp_channel_eq_ok’ reading 6 bytes from a region of size 4 [-Werror=stringop-overread] 4556 | !drm_dp_channel_eq_ok(&esi[10], intel_dp->lane_count)) { | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ drivers/gpu/drm/i915/display/intel_dp.c:4556:22: note: referencing argument 1 of type ‘const u8 *’ {aka ‘const unsigned char *’} In file included from drivers/gpu/drm/i915/display/intel_dp.c:38: include/drm/drm_dp_helper.h:1459:6: note: in a call to function ‘drm_dp_channel_eq_ok’ 1459 | bool drm_dp_channel_eq_ok(const u8 link_status[DP_LINK_STATUS_SIZE], | ^~~~~~~~~~~~~~~~~~~~ Clearly something is wrong here, but I can't quite figure out what. Changing the array size to 16 bytes avoids the warning, but is probably the wrong solution here. Signed-off-by: Arnd Bergmann --- drivers/gpu/drm/i915/display/intel_dp.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/gpu/drm/i915/display/intel_dp.c b/drivers/gpu/drm/i915/display/intel_dp.c index 8c12d5375607..830e2515f119 100644 --- a/drivers/gpu/drm/i915/display/intel_dp.c +++ b/drivers/gpu/drm/i915/display/intel_dp.c @@ -65,7 +65,7 @@ #include "intel_vdsc.h" #include "intel_vrr.h" -#define DP_DPRX_ESI_LEN 14 +#define DP_DPRX_ESI_LEN 16 /* DP DSC throughput values used for slice count calculations KPixels/s */ #define DP_DSC_PEAK_PIXEL_RATE 2720000