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 X-Spam-Level: X-Spam-Status: No, score=-10.1 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id DAEF1C432C1 for ; Tue, 24 Sep 2019 16:42:55 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id A9ADB21848 for ; Tue, 24 Sep 2019 16:42:55 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1569343375; bh=5VSvU6HBfPNZEb5WDAIzTm+/cX7N3Y3hY73y1TIdwtg=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=XOSUnYXX2F1hFi+EmBV0ozbjqjxjKbldm8ybDei2c4AKOKnhaak4pSo740UZjyYzV tTEQD95GlWf0klg+JI/+24/hjE8+paVfBgg7+HH/2cSfz/nx5g+ge53gMKx8FHpLl9 D6twL96xEiMpQIu6g3ap3ZBerrpFlTze0sMy0IZg= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2632838AbfIXQmy (ORCPT ); Tue, 24 Sep 2019 12:42:54 -0400 Received: from mail.kernel.org ([198.145.29.99]:59036 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2409817AbfIXQmf (ORCPT ); Tue, 24 Sep 2019 12:42:35 -0400 Received: from sasha-vm.mshome.net (c-73-47-72-35.hsd1.nh.comcast.net [73.47.72.35]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 3A624217F4; Tue, 24 Sep 2019 16:42:34 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1569343354; bh=5VSvU6HBfPNZEb5WDAIzTm+/cX7N3Y3hY73y1TIdwtg=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=NyQZK9PwXmAfrSU+ydPTncQ37B5xU4U3qnpgdZT4+u22n1JnZ/GaMTDtV7jyyJINO b+yZm91WdcAhnWcBMZ2LrTjJ/WX4NofROFaO7b79FoGLLx0dLqhs/7SkTjHZoJtKcW TujeKxsyMRRNJWuxxXz3a4G0H9dHtKpTT+Vuaf3g= From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Navid Emamdoost , Sam Ravnborg , Sasha Levin , dri-devel@lists.freedesktop.org Subject: [PATCH AUTOSEL 5.3 17/87] drm/panel: check failure cases in the probe func Date: Tue, 24 Sep 2019 12:40:33 -0400 Message-Id: <20190924164144.25591-17-sashal@kernel.org> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20190924164144.25591-1-sashal@kernel.org> References: <20190924164144.25591-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Navid Emamdoost [ Upstream commit afd6d4f5a52c16e1483328ac074abb1cde92c29f ] The following function calls may fail and return NULL, so the null check is added. of_graph_get_next_endpoint of_graph_get_remote_port_parent of_graph_get_remote_port Update: Thanks to Sam Ravnborg, for suggession on the use of goto to avoid leaking endpoint. Signed-off-by: Navid Emamdoost Signed-off-by: Sam Ravnborg Link: https://patchwork.freedesktop.org/patch/msgid/20190724195534.9303-1-navid.emamdoost@gmail.com Signed-off-by: Sasha Levin --- .../gpu/drm/panel/panel-raspberrypi-touchscreen.c | 13 +++++++++++++ 1 file changed, 13 insertions(+) diff --git a/drivers/gpu/drm/panel/panel-raspberrypi-touchscreen.c b/drivers/gpu/drm/panel/panel-raspberrypi-touchscreen.c index 28c0620dfe0f9..b5b14aa059ea7 100644 --- a/drivers/gpu/drm/panel/panel-raspberrypi-touchscreen.c +++ b/drivers/gpu/drm/panel/panel-raspberrypi-touchscreen.c @@ -399,7 +399,13 @@ static int rpi_touchscreen_probe(struct i2c_client *i2c, /* Look up the DSI host. It needs to probe before we do. */ endpoint = of_graph_get_next_endpoint(dev->of_node, NULL); + if (!endpoint) + return -ENODEV; + dsi_host_node = of_graph_get_remote_port_parent(endpoint); + if (!dsi_host_node) + goto error; + host = of_find_mipi_dsi_host_by_node(dsi_host_node); of_node_put(dsi_host_node); if (!host) { @@ -408,6 +414,9 @@ static int rpi_touchscreen_probe(struct i2c_client *i2c, } info.node = of_graph_get_remote_port(endpoint); + if (!info.node) + goto error; + of_node_put(endpoint); ts->dsi = mipi_dsi_device_register_full(host, &info); @@ -428,6 +437,10 @@ static int rpi_touchscreen_probe(struct i2c_client *i2c, return ret; return 0; + +error: + of_node_put(endpoint); + return -ENODEV; } static int rpi_touchscreen_remove(struct i2c_client *i2c) -- 2.20.1