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 Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id F0D2CC4332F for ; Tue, 7 Nov 2023 12:57:30 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234979AbjKGM5b (ORCPT ); Tue, 7 Nov 2023 07:57:31 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:49866 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234835AbjKGM45 (ORCPT ); Tue, 7 Nov 2023 07:56:57 -0500 Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 5819F3273; Tue, 7 Nov 2023 04:28:57 -0800 (PST) Received: by smtp.kernel.org (Postfix) with ESMTPSA id DAFA1C433C9; Tue, 7 Nov 2023 12:28:55 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1699360137; bh=glK+fc6SkALhklAyab2VVmEAZfVWmTE/zUuxVHevs6E=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=WZXCcPmCP2KeSiqARRh/OtK9GrpCcoSmaLcQhmf3/IYzD7RyREV66aTtYURC+MR9T b6Zx6y9qWQSLMKO5k1ccySvTCYjdMip4RD/7kEGB9r3kywg2Nh5hzd/NVEW46DScRj jblaV0exYwhRhd3JU0wAJr9GzcuEkEOf04ltrhysS85rqys1c6/y4z+SrZ/vAADHTi pUy+shgzeCWFZ4TJDvU6a/E0arrB3gVTn22W3Sikv66vCAabWhyv3QCDbpkFavRVDw zrbouVo4UTRl6uaGwB/TQM7f79YHzwc64D22fmdi/8GRdZRFpu5bC3KPeesT5kfJ6l zvM2uvHQcwgfg== From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Ma Ke , Alex Deucher , Sasha Levin , christian.koenig@amd.com, Xinhui.Pan@amd.com, airlied@gmail.com, daniel@ffwll.ch, amd-gfx@lists.freedesktop.org, dri-devel@lists.freedesktop.org Subject: [PATCH AUTOSEL 6.1 19/25] drm/radeon: fix a possible null pointer dereference Date: Tue, 7 Nov 2023 07:26:58 -0500 Message-ID: <20231107122745.3761613-19-sashal@kernel.org> X-Mailer: git-send-email 2.42.0 In-Reply-To: <20231107122745.3761613-1-sashal@kernel.org> References: <20231107122745.3761613-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore X-stable-base: Linux 6.1.61 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Ma Ke [ Upstream commit 2c1fe3c480f9e1deefd50d4b18be4a046011ee1f ] In radeon_tv_get_modes(), the return value of drm_cvt_mode() is assigned to mode, which will lead to a NULL pointer dereference on failure of drm_cvt_mode(). Add a check to avoid null point dereference. Signed-off-by: Ma Ke Signed-off-by: Alex Deucher Signed-off-by: Sasha Levin --- drivers/gpu/drm/radeon/radeon_connectors.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/drivers/gpu/drm/radeon/radeon_connectors.c b/drivers/gpu/drm/radeon/radeon_connectors.c index f7431d2246044..5837af5123a9f 100644 --- a/drivers/gpu/drm/radeon/radeon_connectors.c +++ b/drivers/gpu/drm/radeon/radeon_connectors.c @@ -1122,6 +1122,8 @@ static int radeon_tv_get_modes(struct drm_connector *connector) else { /* only 800x600 is supported right now on pre-avivo chips */ tv_mode = drm_cvt_mode(dev, 800, 600, 60, false, false, false); + if (!tv_mode) + return 0; tv_mode->type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED; drm_mode_probed_add(connector, tv_mode); } -- 2.42.0