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 X-Spam-Level: X-Spam-Status: No, score=-4.2 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED,USER_AGENT_SANE_1 autolearn=no 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 99DBEC432BE for ; Tue, 10 Aug 2021 09:28:18 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 7D61F60EBD for ; Tue, 10 Aug 2021 09:28:18 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S239033AbhHJJ2j (ORCPT ); Tue, 10 Aug 2021 05:28:39 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:49656 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S239027AbhHJJ2h (ORCPT ); Tue, 10 Aug 2021 05:28:37 -0400 Received: from mail-pj1-x102c.google.com (mail-pj1-x102c.google.com [IPv6:2607:f8b0:4864:20::102c]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 6DF7DC0613D3 for ; Tue, 10 Aug 2021 02:28:15 -0700 (PDT) Received: by mail-pj1-x102c.google.com with SMTP id j1so32190395pjv.3 for ; Tue, 10 Aug 2021 02:28:15 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=to:cc:from:subject:message-id:date:user-agent:mime-version :content-transfer-encoding:content-language; bh=X77WBIfldn7rqm2+21Ngl7e086LBbBLmUU8LtON+/iY=; b=tPR88JiHmVARTkdlHzXNVmRayC8gz4m3WoxjQ3pzPQNnx/fUDaTBoFz7klr57I09m5 Ip6/DsMfswcRt3y17XO2Gzzj1aJl1thFKcc/RuOBZMSTQZDM/ZoYlPvoAn+lb2T3/Vwk eH+EUAGDmQCt8qynwNxh4V4seneoVTEyTJjt0FYj0shNM3rBmxnPMNba8vwOYKXucjnB /MUIkjskKx78RMgDBFWMw4tcJE6/OjQkjzA0YB9JorpP/uy0Fim3qBW4fv1DAZtBdmAQ v2AjvrzBDMvz+fpPeiuXvsy3RcRRd+1bfB1ShRTSC3zq+yAYt/CDeuU/7pBlxdxbFKvP Jcjg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:to:cc:from:subject:message-id:date:user-agent :mime-version:content-transfer-encoding:content-language; bh=X77WBIfldn7rqm2+21Ngl7e086LBbBLmUU8LtON+/iY=; b=mIns8H6ceBCSSA6T3B78hrS4DhlyytaSgIGNXqfSQI408BOueW6C/0mGCt58S2qRR3 gL3hnPlnrBkOiRVB1Cdn4/IcwYjzJsTXyebfZpsRJsrwCYCiUn4UsPevp/70hB3X1iEK 6P1vEMBxMhkL5wTdoMb1xIZSn0MgRq/t4gHzq2znulxw8Pj/DIMXawAPWX85ZNZoC9dg rRuwFwWzoEXWiv1pRX4pb3p8/qJEaewDYGFF4jyKILKsXNO2hQEC2KsDt0gH6o8oDvoK KNP7uO+4oXVzQEUoriGVZoaFkLs2X/BFfqL85VGZMLNS+93+l2pGtWKoec4npOwFO0+6 RoNA== X-Gm-Message-State: AOAM531YFK8LKU+fqZX7AFvpzrF8U/ynjpqeoFVHXTHlNdH8zNlgkepb oZLKwcsV2lSNk8iVAQomgw8= X-Google-Smtp-Source: ABdhPJx7FxoxDiTKwaYLzT3evYK5osmhZk91QOFiVQx3BHBVDIWdO7RuM6gWEmb8BAGZLzVq1K+9AQ== X-Received: by 2002:a63:e643:: with SMTP id p3mr838997pgj.213.1628587694956; Tue, 10 Aug 2021 02:28:14 -0700 (PDT) Received: from [10.94.0.22] ([85.203.23.36]) by smtp.gmail.com with ESMTPSA id z15sm27039499pgc.13.2021.08.10.02.28.09 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 10 Aug 2021 02:28:14 -0700 (PDT) To: alexander.deucher@amd.com, christian.koenig@amd.com, Xinhui.Pan@amd.com, airlied@linux.ie, daniel@ffwll.ch, evan.quan@amd.com, luben.tuikov@amd.com, tzimmermann@suse.de, lee.jones@linaro.org, mh12gx2825@gmail.com, sakari.ailus@linux.intel.com, zhangqilong3@huawei.com, pmladek@suse.com Cc: amd-gfx@lists.freedesktop.org, dri-devel@lists.freedesktop.org, Linux Kernel , "baijiaju1990@gmail.com" From: Tuo Li Subject: [BUG] drm/amdgpu: possible null-pointer dereference in dce_vXX_0_afmt_setmode() Message-ID: <650a9f72-712c-c5a3-dc4c-1251fb3bb6cd@gmail.com> Date: Tue, 10 Aug 2021 17:28:07 +0800 User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:78.0) Gecko/20100101 Thunderbird/78.12.0 MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 8bit Content-Language: en-US Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hello, Our static analysis tool finds some possible null-pointer dereferences in the amdgpu driver in Linux 5.14.0-rc3: In dce_v10_0.c: The variable encoder->crtc is checked in: 1591:    if (encoder->crtc) This indicates that encoder->crtc can be NULL. Then the function dce_v10_0_audio_set_dto() is called with the argument encoder: 1600:    ce_v10_0_audio_set_dto(encoder, mode->clock); However, encoder->crtc is dereferenced in this function: 1545:    struct amdgpu_crtc *amdgpu_crtc = to_amdgpu_crtc(encoder->crtc); 1559:    tmp = REG_SET_FIELD(tmp, DCCG_AUDIO_DTO_SOURCE, DCCG_AUDIO_DTO0_SOURCE_SEL, amdgpu_crtc->crtc_id); In dce_v11_0.c and dce_v8_0.c, situations are the same. I am not quite sure whether these possible null-pointer dereferences are real and how to fix them if they are real. Any feedback would be appreciated, thanks! Reported-by: TOTE Robot Best wishes, Tuo Li