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=-10.0 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 3E9D3C433E0 for ; Mon, 10 Aug 2020 15:41:14 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 153AC20774 for ; Mon, 10 Aug 2020 15:41:14 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1597074074; bh=OI8L8JHWA4I07xOnOfrugVYN6Wsn1SSxQOR6XVPL8Yc=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=p3Fja5rysfNl+nRAOgBzrA2ASR465CipXXpt8olIA6tT5NLZB4zHvw02rlzeYFbaM 2CrDvyJ7b7o6ZgJ+Rht+1q5Fr1ELUz/XBHc/NHn0aBl+xq6+byT12T2PK+0gjoLnxr BwFYE9TRUq5XsGT4euKFxLhHZzbLviy90yxYhqnc= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728316AbgHJPX1 (ORCPT ); Mon, 10 Aug 2020 11:23:27 -0400 Received: from mail.kernel.org ([198.145.29.99]:54324 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728303AbgHJPXO (ORCPT ); Mon, 10 Aug 2020 11:23:14 -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 1035F20782; Mon, 10 Aug 2020 15:23:12 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1597072993; bh=OI8L8JHWA4I07xOnOfrugVYN6Wsn1SSxQOR6XVPL8Yc=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=Rq0LTMZTonN6NZ/3ODvV57zVRlpCPlR0GI6mncxtxw/FMKyFVfRW4QW86klUgEQsF p0dtclBK8N/D9p5BbFhv5GyievOmLbsN4Cw7Tpn6Ku7nY3CKEu64hvhdHfE6fi42Iu pxdhGJ6GCt1JRK3RiBp3VTPnfcJvKIrqpOvmEqcs= 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 5.7 29/79] leds: 88pm860x: fix use-after-free on unbind Date: Mon, 10 Aug 2020 17:20:48 +0200 Message-Id: <20200810151813.695460404@linuxfoundation.org> X-Mailer: git-send-email 2.28.0 In-Reply-To: <20200810151812.114485777@linuxfoundation.org> References: <20200810151812.114485777@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@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 @@ -203,21 +203,33 @@ 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);