From patchwork Mon Nov 15 08:10:19 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Yang Li X-Patchwork-Id: 12618905 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 mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 9038DC433EF for ; Mon, 15 Nov 2021 08:10:33 +0000 (UTC) Received: from gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 464E46108D for ; Mon, 15 Nov 2021 08:10:33 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.1 mail.kernel.org 464E46108D Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=linux.alibaba.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=lists.freedesktop.org Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 8C2AB6E93C; Mon, 15 Nov 2021 08:10:32 +0000 (UTC) Received: from out30-43.freemail.mail.aliyun.com (out30-43.freemail.mail.aliyun.com [115.124.30.43]) by gabe.freedesktop.org (Postfix) with ESMTPS id 5DE3E6E937 for ; Mon, 15 Nov 2021 08:10:30 +0000 (UTC) X-Alimail-AntiSpam: AC=PASS; BC=-1|-1; BR=01201311R591e4; CH=green; DM=||false|; DS=||; FP=0|-1|-1|-1|0|-1|-1|-1; HT=e01e04395; MF=yang.lee@linux.alibaba.com; NM=1; PH=DS; RN=11; SR=0; TI=SMTPD_---0Uwbsgz4_1636963823; Received: from j63c13417.sqa.eu95.tbsite.net(mailfrom:yang.lee@linux.alibaba.com fp:SMTPD_---0Uwbsgz4_1636963823) by smtp.aliyun-inc.com(127.0.0.1); Mon, 15 Nov 2021 16:10:25 +0800 From: Yang Li To: daniel@ffwll.ch Subject: [PATCH -next] drm/amd/display: check top_pipe_to_program pointer Date: Mon, 15 Nov 2021 16:10:19 +0800 Message-Id: <1636963819-19726-1-git-send-email-yang.lee@linux.alibaba.com> X-Mailer: git-send-email 1.8.3.1 X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: airlied@linux.ie, llvm@lists.linux.dev, Rodrigo.Siqueira@amd.com, linux-kernel@vger.kernel.org, amd-gfx@lists.freedesktop.org, sunpeng.li@amd.com, Yang Li , dri-devel@lists.freedesktop.org, christian.koenig@amd.com Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" Clang static analysis reports this error drivers/gpu/drm/amd/amdgpu/../display/dc/core/dc.c:2870:7: warning: Dereference of null pointer [clang-analyzer-core.NullDereference] if (top_pipe_to_program->stream_res.tg->funcs->lock_doublebuffer_enable) { ^ top_pipe_to_program being NULL is caught as an error But then it is used to report the error. So add a check before using it. Reported-by: Abaci Robot Signed-off-by: Yang Li --- drivers/gpu/drm/amd/display/dc/core/dc.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/drivers/gpu/drm/amd/display/dc/core/dc.c b/drivers/gpu/drm/amd/display/dc/core/dc.c index 39ad385..34382d0 100644 --- a/drivers/gpu/drm/amd/display/dc/core/dc.c +++ b/drivers/gpu/drm/amd/display/dc/core/dc.c @@ -2867,7 +2867,8 @@ static void commit_planes_for_stream(struct dc *dc, #endif if ((update_type != UPDATE_TYPE_FAST) && stream->update_flags.bits.dsc_changed) - if (top_pipe_to_program->stream_res.tg->funcs->lock_doublebuffer_enable) { + if (top_pipe_to_program && + top_pipe_to_program->stream_res.tg->funcs->lock_doublebuffer_enable) { if (should_use_dmub_lock(stream->link)) { union dmub_hw_lock_flags hw_locks = { 0 }; struct dmub_hw_lock_inst_flags inst_flags = { 0 };