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[2620:137:e000::1:20]) by mx.google.com with ESMTP id sg16-20020a170907a41000b0073c0169863dsi11266843ejc.465.2022.11.10.05.57.31; Thu, 10 Nov 2022 05:57:57 -0800 (PST) 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=FbYEQ4sM; 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 S231220AbiKJNsH (ORCPT + 99 others); Thu, 10 Nov 2022 08:48:07 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:60750 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231216AbiKJNsD (ORCPT ); Thu, 10 Nov 2022 08:48:03 -0500 Received: from mail-wr1-x430.google.com (mail-wr1-x430.google.com [IPv6:2a00:1450:4864:20::430]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 8B8D76B3B3 for ; Thu, 10 Nov 2022 05:48:02 -0800 (PST) Received: by mail-wr1-x430.google.com with SMTP id l14so2348105wrw.2 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=RymnMRauhq94YLaum1HqbbBu9CoCNAUgzYMeb1BHDzwYuI0ETxFKGcHxGm3eZwzImD gk9NXtHZdkJCLt1b6V0xhNXp4t2Ny3+3JfdzQ+xqhR/IXoJmxP6YNaO0ArnXUrGk3YbB Bf1g5A5MEbhnLtcvOZXTQZaLQNo5MkHLw1GE+jdmSN1Szn7L6MGfQbpLIuibnQB8YXP0 BX8VUNThxnlOSdRw/IhMJXobCW8ALy3mTvCrNTD/0X+Xw0Kus2+aK2Fkg/inM3BdM8v8 /Mt2tyoD2qVNdnwBK4B4I242vtiUzESrfLjYVNIraM8/JqKWUsszAsV67GW0cisxzmIX 5IyQ== X-Gm-Message-State: ACrzQf3R/xmyYUYqdubmcdH+pBaS3HGDnyMl+ChiN/e1HIPyp8B87yoX SOVHo9VTHSM33wVVOxD6RnQ= 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 Cc: emma@anholt.net, airlied@gmail.com, daniel@ffwll.ch, dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org, =?utf-8?b?Sm9zw6kgRXhww7NzaXRv?= 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-Spam-Status: No, score=-1.8 required=5.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,FREEMAIL_ENVFROM_END_DIGIT, FREEMAIL_FROM,RCVD_IN_DNSWL_NONE,SPF_HELO_NONE,SPF_PASS 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 X-getmail-retrieved-from-mailbox: =?utf-8?q?INBOX?= X-GMAIL-THRID: =?utf-8?q?1749117164925736988?= X-GMAIL-MSGID: =?utf-8?q?1749117752938962952?= 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;