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=-9.0 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,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 7447BC04E53 for ; Wed, 15 May 2019 11:40:06 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 4339B2053B for ; Wed, 15 May 2019 11:40:06 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1557920406; bh=j0IGcgF6+P9TRifH3fJfkrkLZujfAjY6qjAoiIJAT+g=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=JXSNvjNJb44wwEJszojey+5Fq/bRwEXrYshm2Dg1+izzTgGeq1lcY53ndtNuo3WwL TmYctiI47xX9BeaiTU50CXzhBqFarP4ttdSeM60Kiw6Y+VsX/TuL7kNWsa/Vjmi500 zUSg/2ngYCbSSXcNSvKp5v4GCuuBim9e1vEtyWC0= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727377AbfEOL3p (ORCPT ); Wed, 15 May 2019 07:29:45 -0400 Received: from mail.kernel.org ([198.145.29.99]:41086 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729916AbfEOL3o (ORCPT ); Wed, 15 May 2019 07:29:44 -0400 Received: from localhost (83-86-89-107.cable.dynamic.v4.ziggo.nl [83.86.89.107]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 41BD621473; Wed, 15 May 2019 11:29:43 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1557919783; bh=j0IGcgF6+P9TRifH3fJfkrkLZujfAjY6qjAoiIJAT+g=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=wraTOP3gT4i4nA7F3KX2CQZ3Nlu7KYQAFT9vY9re/cPJEe7Kn/5Pte9j/tjs7+PwR Nr0/PueTUq3v+TpZrk+F3pTf2veCF+ZTALBm0365fT04NPfx3eqgwPs/6VuxpyEUsm jraiQSHRILHid42glwL+u5CxzRzqW9dbCbeTvDjE= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Geert Uytterhoeven , Mukesh Ojha , Linus Walleij , Sasha Levin Subject: [PATCH 5.0 093/137] gpio: Fix gpiochip_add_data_with_key() error path Date: Wed, 15 May 2019 12:56:14 +0200 Message-Id: <20190515090700.291749384@linuxfoundation.org> X-Mailer: git-send-email 2.21.0 In-Reply-To: <20190515090651.633556783@linuxfoundation.org> References: <20190515090651.633556783@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: stable-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org [ Upstream commit 357798909164bf423eac6a78ff7da7e98d2d7f7f ] The err_remove_chip block is too coarse, and may perform cleanup that must not be done. E.g. if of_gpiochip_add() fails, of_gpiochip_remove() is still called, causing: OF: ERROR: Bad of_node_put() on /soc/gpio@e6050000 CPU: 1 PID: 20 Comm: kworker/1:1 Not tainted 5.1.0-rc2-koelsch+ #407 Hardware name: Generic R-Car Gen2 (Flattened Device Tree) Workqueue: events deferred_probe_work_func [] (unwind_backtrace) from [] (show_stack+0x10/0x14) [] (show_stack) from [] (dump_stack+0x7c/0x9c) [] (dump_stack) from [] (kobject_put+0x94/0xbc) [] (kobject_put) from [] (gpiochip_add_data_with_key+0x8d8/0xa3c) [] (gpiochip_add_data_with_key) from [] (gpio_rcar_probe+0x1d4/0x314) [] (gpio_rcar_probe) from [] (platform_drv_probe+0x48/0x94) and later, if a GPIO consumer tries to use a GPIO from a failed controller: WARNING: CPU: 0 PID: 1 at lib/refcount.c:156 kobject_get+0x38/0x4c refcount_t: increment on 0; use-after-free. Modules linked in: CPU: 0 PID: 1 Comm: swapper/0 Not tainted 5.1.0-rc2-koelsch+ #407 Hardware name: Generic R-Car Gen2 (Flattened Device Tree) [] (unwind_backtrace) from [] (show_stack+0x10/0x14) [] (show_stack) from [] (dump_stack+0x7c/0x9c) [] (dump_stack) from [] (__warn+0xd0/0xec) [] (__warn) from [] (warn_slowpath_fmt+0x44/0x6c) [] (warn_slowpath_fmt) from [] (kobject_get+0x38/0x4c) [] (kobject_get) from [] (of_node_get+0x14/0x1c) [] (of_node_get) from [] (of_find_node_by_phandle+0xc0/0xf0) [] (of_find_node_by_phandle) from [] (of_phandle_iterator_next+0x68/0x154) [] (of_phandle_iterator_next) from [] (__of_parse_phandle_with_args+0x40/0xd0) [] (__of_parse_phandle_with_args) from [] (of_parse_phandle_with_args_map+0x100/0x3ac) [] (of_parse_phandle_with_args_map) from [] (of_get_named_gpiod_flags+0x38/0x380) [] (of_get_named_gpiod_flags) from [] (gpiod_get_from_of_node+0x24/0xd8) [] (gpiod_get_from_of_node) from [] (devm_fwnode_get_index_gpiod_from_child+0xa0/0x144) [] (devm_fwnode_get_index_gpiod_from_child) from [] (gpio_keys_probe+0x418/0x7bc) [] (gpio_keys_probe) from [] (platform_drv_probe+0x48/0x94) Fix this by splitting the cleanup block, and adding a missing call to gpiochip_irqchip_remove(). Fixes: 28355f81969962cf ("gpio: defer probe if pinctrl cannot be found") Signed-off-by: Geert Uytterhoeven Reviewed-by: Mukesh Ojha Signed-off-by: Linus Walleij Signed-off-by: Sasha Levin --- drivers/gpio/gpiolib.c | 12 ++++++++---- 1 file changed, 8 insertions(+), 4 deletions(-) diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c index d1adfdf50fb30..34fbf879411f6 100644 --- a/drivers/gpio/gpiolib.c +++ b/drivers/gpio/gpiolib.c @@ -1379,7 +1379,7 @@ int gpiochip_add_data_with_key(struct gpio_chip *chip, void *data, status = gpiochip_add_irqchip(chip, lock_key, request_key); if (status) - goto err_remove_chip; + goto err_free_gpiochip_mask; status = of_gpiochip_add(chip); if (status) @@ -1387,7 +1387,7 @@ int gpiochip_add_data_with_key(struct gpio_chip *chip, void *data, status = gpiochip_init_valid_mask(chip); if (status) - goto err_remove_chip; + goto err_remove_of_chip; for (i = 0; i < chip->ngpio; i++) { struct gpio_desc *desc = &gdev->descs[i]; @@ -1415,14 +1415,18 @@ int gpiochip_add_data_with_key(struct gpio_chip *chip, void *data, if (gpiolib_initialized) { status = gpiochip_setup_dev(gdev); if (status) - goto err_remove_chip; + goto err_remove_acpi_chip; } return 0; -err_remove_chip: +err_remove_acpi_chip: acpi_gpiochip_remove(chip); +err_remove_of_chip: gpiochip_free_hogs(chip); of_gpiochip_remove(chip); +err_remove_chip: + gpiochip_irqchip_remove(chip); +err_free_gpiochip_mask: gpiochip_free_valid_mask(chip); err_remove_irqchip_mask: gpiochip_irqchip_free_valid_mask(chip); -- 2.20.1