From patchwork Thu Aug 20 09:20:36 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Greg KH X-Patchwork-Id: 265497 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=-9.8 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED, DKIM_VALID, HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham 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 B2D64C433DF for ; Thu, 20 Aug 2020 12:05:59 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 831F9207FB for ; Thu, 20 Aug 2020 12:05:59 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1597925159; bh=HhvuGrhIoMOLBd1KuBa1rj5Gqz6wjjeu2yg+vgrPcn4=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=ogwBCf8PDZmN/fcKHnsyMvLZpEZ1MwVUcLYIA6s5PfWbrDxapqzhNNWnttp1I2xQY 2tvOSzyi9IJ0sd4q0XqZxghgVwlB4DC4/G72/XV8ZY5GuMN/uCAdvUPvrTwKyKPoEF 21cMVBg+FJq7unytcdAjXJEWv6oI3lgfvdnLOtgg= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728074AbgHTMF6 (ORCPT ); Thu, 20 Aug 2020 08:05:58 -0400 Received: from mail.kernel.org ([198.145.29.99]:44006 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729905AbgHTJ6x (ORCPT ); Thu, 20 Aug 2020 05:58:53 -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 4E56E2067C; Thu, 20 Aug 2020 09:58:52 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1597917532; bh=HhvuGrhIoMOLBd1KuBa1rj5Gqz6wjjeu2yg+vgrPcn4=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=bpQYhAK+ciRbYD5vp6l2/7z0rOF2KN5gfKbrmmF7YJst1q+lTJUwZZcw3s8Fq5DA+ 9/2xPDWavwRmIIioOYiLzpwYvrIiU/PGPtlMqzWS5Jpvf2erR/UItIxo0vz8KmCAp6 SJVKELOduAAn83xSN7y8fctN5dyWRWPv4FvCYDRQ= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Amitoj Kaur Chawla , Johan Hovold , Pavel Machek Subject: [PATCH 4.9 063/212] leds: 88pm860x: fix use-after-free on unbind Date: Thu, 20 Aug 2020 11:20:36 +0200 Message-Id: <20200820091605.557397387@linuxfoundation.org> X-Mailer: git-send-email 2.28.0 In-Reply-To: <20200820091602.251285210@linuxfoundation.org> References: <20200820091602.251285210@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Sender: stable-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Johan Hovold commit eca21c2d8655387823d695b26e6fe78cf3975c05 upstream. Several MFD child drivers register their class devices directly under the parent device. This means you cannot blindly do devres conversions so that deregistration ends up being tied to the parent device, something which leads to use-after-free on driver unbind when the class device is released while still being registered. Fixes: 375446df95ee ("leds: 88pm860x: Use devm_led_classdev_register") Cc: stable # 4.6 Cc: Amitoj Kaur Chawla Signed-off-by: Johan Hovold Signed-off-by: Pavel Machek Signed-off-by: Greg Kroah-Hartman --- drivers/leds/leds-88pm860x.c | 14 +++++++++++++- 1 file changed, 13 insertions(+), 1 deletion(-) --- a/drivers/leds/leds-88pm860x.c +++ b/drivers/leds/leds-88pm860x.c @@ -207,21 +207,33 @@ static int pm860x_led_probe(struct platf data->cdev.brightness_set_blocking = pm860x_led_set; mutex_init(&data->lock); - ret = devm_led_classdev_register(chip->dev, &data->cdev); + ret = led_classdev_register(chip->dev, &data->cdev); if (ret < 0) { dev_err(&pdev->dev, "Failed to register LED: %d\n", ret); return ret; } pm860x_led_set(&data->cdev, 0); + + platform_set_drvdata(pdev, data); + return 0; } +static int pm860x_led_remove(struct platform_device *pdev) +{ + struct pm860x_led *data = platform_get_drvdata(pdev); + + led_classdev_unregister(&data->cdev); + + return 0; +} static struct platform_driver pm860x_led_driver = { .driver = { .name = "88pm860x-led", }, .probe = pm860x_led_probe, + .remove = pm860x_led_remove, }; module_platform_driver(pm860x_led_driver);