From patchwork Wed Aug 8 02:56:51 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jeykumar Sankaran X-Patchwork-Id: 10559415 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 1B91213B4 for ; Wed, 8 Aug 2018 02:57:02 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 0AFFA29042 for ; Wed, 8 Aug 2018 02:57:02 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id F152329089; Wed, 8 Aug 2018 02:57:01 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-5.2 required=2.0 tests=BAYES_00,MAILING_LIST_MULTI, RCVD_IN_DNSWL_MED autolearn=ham version=3.3.1 Received: from gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) (using TLSv1.2 with cipher DHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id ADBCC29042 for ; Wed, 8 Aug 2018 02:57:01 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 1ED456E037; Wed, 8 Aug 2018 02:56:59 +0000 (UTC) X-Original-To: dri-devel@lists.freedesktop.org Delivered-To: dri-devel@lists.freedesktop.org Received: from smtp.codeaurora.org (smtp.codeaurora.org [198.145.29.96]) by gabe.freedesktop.org (Postfix) with ESMTPS id E15956E00A; Wed, 8 Aug 2018 02:56:57 +0000 (UTC) Received: by smtp.codeaurora.org (Postfix, from userid 1000) id 88B41606FA; Wed, 8 Aug 2018 02:56:57 +0000 (UTC) Received: from jeykumar-linux.qualcomm.com (i-global254.qualcomm.com [199.106.103.254]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-SHA256 (128/128 bits)) (No client certificate requested) (Authenticated sender: jsanka@smtp.codeaurora.org) by smtp.codeaurora.org (Postfix) with ESMTPSA id 9DF7B604BE; Wed, 8 Aug 2018 02:56:56 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 smtp.codeaurora.org 9DF7B604BE From: Jeykumar Sankaran To: dri-devel@lists.freedesktop.org, freedreno@lists.freedesktop.org, linux-arm-msm@vger.kernel.org Subject: [PATCH] drm/msm/disp/dpu: fix early dereference of physical encoder Date: Tue, 7 Aug 2018 19:56:51 -0700 Message-Id: <1533697011-27750-1-git-send-email-jsanka@codeaurora.org> X-Mailer: git-send-email 1.9.1 X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: hoegsberg@google.com MIME-Version: 1.0 Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" X-Virus-Scanned: ClamAV using ClamSMTP This change validates the physical encoder before it is dereferenced. Signed-off-by: Jeykumar Sankaran --- drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c index 0922d35..1b4de34 100644 --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c @@ -2444,6 +2444,8 @@ int dpu_encoder_wait_for_event(struct drm_encoder *drm_enc, for (i = 0; i < dpu_enc->num_phys_encs; i++) { struct dpu_encoder_phys *phys = dpu_enc->phys_encs[i]; + if (!phys) + continue; switch (event) { case MSM_ENC_COMMIT_DONE: @@ -2461,7 +2463,7 @@ int dpu_encoder_wait_for_event(struct drm_encoder *drm_enc, return -EINVAL; }; - if (phys && fn_wait) { + if (fn_wait) { DPU_ATRACE_BEGIN("wait_for_completion_event"); ret = fn_wait(phys); DPU_ATRACE_END("wait_for_completion_event");