From mboxrd@z Thu Jan 1 00:00:00 1970 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 78B96C43217 for ; Mon, 10 Oct 2022 00:21:19 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232500AbiJJAVR (ORCPT ); Sun, 9 Oct 2022 20:21:17 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:43456 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232406AbiJJAT6 (ORCPT ); Sun, 9 Oct 2022 20:19:58 -0400 Received: from dfw.source.kernel.org (dfw.source.kernel.org [139.178.84.217]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 08A26A1BC; Sun, 9 Oct 2022 16:54:25 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id 23F8060CF5; Sun, 9 Oct 2022 23:54:24 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 74C27C433C1; Sun, 9 Oct 2022 23:54:21 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1665359663; bh=yJx+/E1EY/DtGN2LEmPxbKE0lwQuxR4Vl2+EU5o87LM=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=FreNLG2KCwW33odUyOINZ1Gyhdkq4lkMNi5gkJj0Jil+nFFLJnJzlJCqgPIFYI8eZ kgmWTgQ4GT5nZwUXilNGcYRKEnwuArKu/9PyCbUpd8+u0Qbr7J5yDxe3+0NNG/BW9Q MoLJowBdbYJBxE+iPqeWggXS+VAHugLL+QrLfJbrXYVzvhICKNQ8cEEE79tWX/upc+ zSw1SmtIqyoef6Vm99yp2OazNk0Gn5zJ1VdeMitsNVKDkI/URviC8vzvHDjTC1thPW 2yFPz7+/T2MAeU1Qnfkj1LPCqrLONuJz8lNbPyHfbx2tM6sYhtXMzu1jatshnGdFrd bqj+TP3um/M8Q== From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Hamza Mahfooz , Aurabindo Pillai , Alex Deucher , Sasha Levin , harry.wentland@amd.com, sunpeng.li@amd.com, Rodrigo.Siqueira@amd.com, christian.koenig@amd.com, Xinhui.Pan@amd.com, airlied@gmail.com, daniel@ffwll.ch, Alvin.Lee2@amd.com, Pavle.Kotarac@amd.com, alex.hung@amd.com, hanghong.ma@amd.com, hersenwu@amd.com, paul.hsieh@amd.com, Jimmy.Kizito@amd.com, amd-gfx@lists.freedesktop.org, dri-devel@lists.freedesktop.org Subject: [PATCH AUTOSEL 5.19 35/36] drm/amd/display: fix array-bounds error in dc_stream_remove_writeback() Date: Sun, 9 Oct 2022 19:52:21 -0400 Message-Id: <20221009235222.1230786-35-sashal@kernel.org> X-Mailer: git-send-email 2.35.1 In-Reply-To: <20221009235222.1230786-1-sashal@kernel.org> References: <20221009235222.1230786-1-sashal@kernel.org> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Hamza Mahfooz [ Upstream commit 5d8c3e836fc224dfe633e41f7f2856753b39a905 ] Address the following error: drivers/gpu/drm/amd/amdgpu/../display/dc/core/dc_stream.c: In function ‘dc_stream_remove_writeback’: drivers/gpu/drm/amd/amdgpu/../display/dc/core/dc_stream.c:527:55: error: array subscript [0, 0] is outside array bounds of ‘struct dc_writeback_info[1]’ [-Werror=array-bounds] 527 | stream->writeback_info[j] = stream->writeback_info[i]; | ~~~~~~~~~~~~~~~~~~~~~~^~~ In file included from ./drivers/gpu/drm/amd/amdgpu/../display/dc/dc.h:1269, from ./drivers/gpu/drm/amd/amdgpu/../display/dc/inc/core_types.h:29, from ./drivers/gpu/drm/amd/amdgpu/../display/dc/basics/dc_common.h:29, from drivers/gpu/drm/amd/amdgpu/../display/dc/core/dc_stream.c:27: ./drivers/gpu/drm/amd/amdgpu/../display/dc/dc_stream.h:241:34: note: while referencing ‘writeback_info’ 241 | struct dc_writeback_info writeback_info[MAX_DWB_PIPES]; | Currently, we aren't checking to see if j remains within writeback_info[]'s bounds. So, add a check to make sure that we aren't overflowing the buffer. Reviewed-by: Aurabindo Pillai Signed-off-by: Hamza Mahfooz Signed-off-by: Alex Deucher Signed-off-by: Sasha Levin --- drivers/gpu/drm/amd/display/dc/core/dc_stream.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/gpu/drm/amd/display/dc/core/dc_stream.c b/drivers/gpu/drm/amd/display/dc/core/dc_stream.c index de8b214132a2..5e460b16d650 100644 --- a/drivers/gpu/drm/amd/display/dc/core/dc_stream.c +++ b/drivers/gpu/drm/amd/display/dc/core/dc_stream.c @@ -516,7 +516,7 @@ bool dc_stream_remove_writeback(struct dc *dc, } /* remove writeback info for disabled writeback pipes from stream */ - for (i = 0, j = 0; i < stream->num_wb_info; i++) { + for (i = 0, j = 0; i < stream->num_wb_info && j < MAX_DWB_PIPES; i++) { if (stream->writeback_info[i].wb_enabled) { if (i != j) /* trim the array */ -- 2.35.1