From patchwork Thu Nov 10 13:47:52 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: =?utf-8?b?Sm9zw6kgRXhww7NzaXRv?= X-Patchwork-Id: 13038818 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 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 smtp.lore.kernel.org (Postfix) with ESMTPS id 045BBC4332F for ; Thu, 10 Nov 2022 13:48:18 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 71DBE10E7BE; Thu, 10 Nov 2022 13:48:12 +0000 (UTC) Received: from mail-wr1-x431.google.com (mail-wr1-x431.google.com [IPv6:2a00:1450:4864:20::431]) by gabe.freedesktop.org (Postfix) with ESMTPS id E57A410E7B8 for ; Thu, 10 Nov 2022 13:48:02 +0000 (UTC) Received: by mail-wr1-x431.google.com with SMTP id k8so2357218wrh.1 for ; Thu, 10 Nov 2022 05:48:02 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20210112; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=dFQJswkFzF6rVK/ySLw3u7BUeEqvWgS7HaoyjTUbHaU=; b=FbYEQ4sMHFTKTwrRg+TG7p4q/Sr4qC7TP+ZtXyuyZAo3X/0cPO8yi/3DZcDjiSJbmY W6IVpxLaN2Nh/907f6VE9WpUWDsacrmTcvjmaQbc1K3qvhJcBwH99WHeauqEFD6dTq9h A2hdmu9SQVRciA7r1JEnwzQwioxi3IkeYWz0h1oojcrY+tRWuHICQPJAxdettUko9BwS BdpYTJBNDjqTGO9eXrOAL2nwNNXzGmdqLsSCauwh9jgdgHxB5bPThosvesBkr9u06xUH FF2wdmAP8xn4m5Os2UWdRjTrewr45n02PBcTLjVrbW7F8Un9M4+4ThHm62SiSfwTgesf d48w== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=dFQJswkFzF6rVK/ySLw3u7BUeEqvWgS7HaoyjTUbHaU=; b=VoABHcanwWaOdODoG1QuiSgSG7ETwZfqGM22uCQua8xVu32LcRGX3uX5rdT6NiLPor xPg8IddaygBXDIEi0jvQY89AVO2834dSZRydS4hQzv9DVzAlMtxlZmxltCYnuS+pg4ST RZsINfBe3Xu2+egLbxnqV3lT7voy15v5ews7WlWx+FqZJOhligqMdRp7ly0e/YiFdoLf /T/Z7SIrMBlDA02w9Xap21eR5BW4fJQAAAb6R94S1GJovZIOL8ezYjvQ5HcrT9ylW51P sSBPMiRYQ/QfO16aVxthGw9R3l2ysYf1/s6iApph34TTPiO204+BeLyyAL2p1GUQH4O7 rN7Q== X-Gm-Message-State: ACrzQf1FTYOJfIr7oUh+EhdLKbD2DIfMPZ/xyIhZMzBNvtLoFlDHZ8zW PK8M02xfPMSWfuDrepL0fNg= X-Google-Smtp-Source: AMsMyM7gP18kf7x+r2v5ySSaGrpwqLnSocitkDpa2Ir6vPYu4sHLNdb9K9bA9IMDJVsOH9kpsnIG3A== X-Received: by 2002:adf:e603:0:b0:236:80ac:5f4b with SMTP id p3-20020adfe603000000b0023680ac5f4bmr40517495wrm.83.1668088081038; Thu, 10 Nov 2022 05:48:01 -0800 (PST) Received: from localhost.localdomain ([94.73.35.109]) by smtp.gmail.com with ESMTPSA id h2-20020a5d4302000000b0022ae0965a8asm15717060wrq.24.2022.11.10.05.48.00 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 10 Nov 2022 05:48:00 -0800 (PST) From: =?utf-8?b?Sm9zw6kgRXhww7NzaXRv?= To: mripard@kernel.org Subject: [PATCH v2 2/2] drm/vc4: hdmi: Fix pointer dereference before check Date: Thu, 10 Nov 2022 14:47:52 +0100 Message-Id: <20221110134752.238820-3-jose.exposito89@gmail.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20221110134752.238820-1-jose.exposito89@gmail.com> References: <20221110134752.238820-1-jose.exposito89@gmail.com> MIME-Version: 1.0 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: emma@anholt.net, linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org, =?utf-8?b?Sm9zw6kgRXhww7NzaXRv?= Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" Commit 6bed2ea3cb38 ("drm/vc4: hdmi: Reset link on hotplug") introduced the vc4_hdmi_reset_link() function. This function dereferences the "connector" pointer before checking whether it is NULL or not. Rework variable assignment to avoid this issue. Fixes: 6bed2ea3cb38 ("drm/vc4: hdmi: Reset link on hotplug") Signed-off-by: José Expósito --- drivers/gpu/drm/vc4/vc4_hdmi.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) diff --git a/drivers/gpu/drm/vc4/vc4_hdmi.c b/drivers/gpu/drm/vc4/vc4_hdmi.c index a49f88e5d2b9..6b223a5fcf6f 100644 --- a/drivers/gpu/drm/vc4/vc4_hdmi.c +++ b/drivers/gpu/drm/vc4/vc4_hdmi.c @@ -318,8 +318,8 @@ static int reset_pipe(struct drm_crtc *crtc, static int vc4_hdmi_reset_link(struct drm_connector *connector, struct drm_modeset_acquire_ctx *ctx) { - struct drm_device *drm = connector->dev; - struct vc4_hdmi *vc4_hdmi = connector_to_vc4_hdmi(connector); + struct drm_device *drm; + struct vc4_hdmi *vc4_hdmi; struct drm_connector_state *conn_state; struct drm_crtc_state *crtc_state; struct drm_crtc *crtc; @@ -330,6 +330,7 @@ static int vc4_hdmi_reset_link(struct drm_connector *connector, if (!connector) return 0; + drm = connector->dev; ret = drm_modeset_lock(&drm->mode_config.connection_mutex, ctx); if (ret) return ret; @@ -347,6 +348,7 @@ static int vc4_hdmi_reset_link(struct drm_connector *connector, if (!crtc_state->active) return 0; + vc4_hdmi = connector_to_vc4_hdmi(connector); if (!vc4_hdmi_supports_scrambling(vc4_hdmi)) return 0;