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[2620:137:e000::1:20]) by mx.google.com with ESMTP id a8-20020a17090680c800b006df76385e5csi13114837ejx.764.2022.03.28.04.44.52; Mon, 28 Mar 2022 04:45:18 -0700 (PDT) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20; Authentication-Results: mx.google.com; dkim=pass header.i=@gmail.com header.s=20210112 header.b=VZ4ulUcf; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=QUARANTINE dis=NONE) header.from=gmail.com Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235614AbiC0Hel (ORCPT + 99 others); Sun, 27 Mar 2022 03:34:41 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:56086 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S235092AbiC0Hej (ORCPT ); Sun, 27 Mar 2022 03:34:39 -0400 Received: from mail-pj1-x1035.google.com (mail-pj1-x1035.google.com [IPv6:2607:f8b0:4864:20::1035]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id C5A4F1B7AB; Sun, 27 Mar 2022 00:33:01 -0700 (PDT) Received: by mail-pj1-x1035.google.com with SMTP id v4so11257411pjh.2; Sun, 27 Mar 2022 00:33:01 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20210112; h=from:to:cc:subject:date:message-id; bh=YKubZFE6bM+QSkBsG+9QO1RxuSxqs+5gFlfSVbQQPZM=; b=VZ4ulUcfcPskQTm+VP+1tNFGk9rxfIjmMpkWEYsSvkdG8F0oPCs5b2j+Ayxot6MhTY sIM1zO7pvPXr5csmHmxug3yU8T450E66bZa5PM+UuyTrhahCi0J2x7zs20c5uNpWDEuS 2u2N/5dr8tpEwfrho4YZuhqrVZxQnX/9dIdWW9C+rp2SxaWzPFpAyVsTSw4odFx6+yaV FSCc40Sy0WVQl/2T0zNgitx5om5ds0AE41dxr6Ebah7IdMOL5ZnHulfneOygKC9kmivs /r/CwCmM0C2nB5zyeH5ZpDG3Ja1/VcfegeGPnV2xbjA76xO0jczW9+GI0EIQjXLnhVbN PSjg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:from:to:cc:subject:date:message-id; bh=YKubZFE6bM+QSkBsG+9QO1RxuSxqs+5gFlfSVbQQPZM=; b=PXeNGO7U4/rPEYRaBDkecv+E6pQr1vDLAr1MbgXj6+DDYIBkDMfxqVr+nQRbJLG1dU lChijgyu6or5GFbuF7Hvq0ZZx0zovFg9kcyj1f8FQlFko3xpfAlUMA/WkLyC7HLhBN59 AkrCuUfGeIBV0daAjcPJYH2bBqEbrlerWDnXFOdp+Y2WPct4xceGzj3LX5x8ecKLQ/kJ QtgCERnHUAKuBHmswWLEg2ublipwMfTZiGwo5vc49hkN9cUcqVF2zw9gmjqn6j0gBxnr xsI7giA5/iW8SEuBNhdnnvwYHag+Gb1iwzD/CBTlEnBrlCvXGiFYQXz9eFsT3V8DuOqv pi+g== X-Gm-Message-State: AOAM531UZ9wpuh3hrQEXkKmedcLEelz3BBgPIjuPw5/acro3KHR6v7Dj LpKuDkMH2pzKDxXfAKAxPi0= X-Received: by 2002:a17:90a:4897:b0:1c7:5fce:cbcd with SMTP id b23-20020a17090a489700b001c75fcecbcdmr32747388pjh.45.1648366381225; Sun, 27 Mar 2022 00:33:01 -0700 (PDT) Received: from localhost ([115.220.243.108]) by smtp.gmail.com with ESMTPSA id h14-20020a63384e000000b00366ba5335e7sm9528888pgn.72.2022.03.27.00.33.00 (version=TLS1_2 cipher=ECDHE-ECDSA-CHACHA20-POLY1305 bits=256/256); Sun, 27 Mar 2022 00:33:00 -0700 (PDT) From: Xiaomeng Tong To: robdclark@gmail.com, sean@poorly.run, airlied@linux.ie, daniel@ffwll.ch Cc: quic_abhinavk@quicinc.com, dmitry.baryshkov@linaro.org, swboyd@chromium.org, bjorn.andersson@linaro.org, quic_khsieh@quicinc.com, quic_kalyant@quicinc.com, markyacoub@google.com, jsanka@codeaurora.org, linux-arm-msm@vger.kernel.org, dri-devel@lists.freedesktop.org, freedreno@lists.freedesktop.org, linux-kernel@vger.kernel.org, Xiaomeng Tong , stable@vger.kernel.org Subject: [PATCH] dpu1: dpu_encoder: fix a missing check on list iterator Date: Sun, 27 Mar 2022 15:32:52 +0800 Message-Id: <20220327073252.10871-1-xiam0nd.tong@gmail.com> X-Mailer: git-send-email 2.17.1 X-Spam-Status: No, score=-2.1 required=5.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,FREEMAIL_FROM, RCVD_IN_DNSWL_NONE,SPF_HELO_NONE,SPF_PASS,T_SCC_BODY_TEXT_LINE autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org The bug is here: cstate = to_dpu_crtc_state(drm_crtc->state); For the drm_for_each_crtc(), just like list_for_each_entry(), the list iterator 'drm_crtc' will point to a bogus position containing HEAD if the list is empty or no element is found. This case must be checked before any use of the iterator, otherwise it will lead to a invalid memory access. To fix this bug, use a new variable 'iter' as the list iterator, while use the origin variable 'drm_crtc' as a dedicated pointer to point to the found element. Cc: stable@vger.kernel.org Fixes: b107603b4ad0f ("drm/msm/dpu: map mixer/ctl hw blocks in encoder modeset") Signed-off-by: Xiaomeng Tong --- drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c | 11 ++++++++--- 1 file changed, 8 insertions(+), 3 deletions(-) diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c index 1e648db439f9..d3fdb18e96f9 100644 --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c @@ -965,7 +965,7 @@ static void dpu_encoder_virt_mode_set(struct drm_encoder *drm_enc, struct dpu_kms *dpu_kms; struct list_head *connector_list; struct drm_connector *conn = NULL, *conn_iter; - struct drm_crtc *drm_crtc; + struct drm_crtc *drm_crtc = NULL, *iter; struct dpu_crtc_state *cstate; struct dpu_global_state *global_state; struct dpu_hw_blk *hw_pp[MAX_CHANNELS_PER_ENC]; @@ -1007,9 +1007,14 @@ static void dpu_encoder_virt_mode_set(struct drm_encoder *drm_enc, return; } - drm_for_each_crtc(drm_crtc, drm_enc->dev) - if (drm_crtc->state->encoder_mask & drm_encoder_mask(drm_enc)) + drm_for_each_crtc(iter, drm_enc->dev) + if (iter->state->encoder_mask & drm_encoder_mask(drm_enc)) { + drm_crtc = iter; break; + } + + if (!drm_crtc) + return; /* Query resource that have been reserved in atomic check step. */ num_pp = dpu_rm_get_assigned_resources(&dpu_kms->rm, global_state, -- 2.17.1