From patchwork Mon Aug 10 15:19:18 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Greg KH X-Patchwork-Id: 266709 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 17187C433DF for ; Mon, 10 Aug 2020 15:20:22 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id BB17220772 for ; Mon, 10 Aug 2020 15:20:21 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1597072821; bh=lI6E/4lPK/biapph8fLlSw8m7Ev/Xq7lJP/iubY+u2o=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=p2ylAfA9r+1/KJ3RGilQ2ax49s764RIerrK1KShoRhdfgPbLO69OMsJvtUG6FlSQl SA+MctfgdIc6J9ZTEtOUKYFAxxXRqPZj+Sw8psneMr1TdR4Y87M4oKDPgU4+9He/AQ OvV0x8y9tgD08vTiyfP7IhBZbApPMC+OF2NkTtGs= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727957AbgHJPUU (ORCPT ); Mon, 10 Aug 2020 11:20:20 -0400 Received: from mail.kernel.org ([198.145.29.99]:50626 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727956AbgHJPUR (ORCPT ); Mon, 10 Aug 2020 11:20:17 -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 75A4220772; Mon, 10 Aug 2020 15:20:16 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1597072817; bh=lI6E/4lPK/biapph8fLlSw8m7Ev/Xq7lJP/iubY+u2o=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=ubfWQLs8+T+U9PbZm1nQz58vvGokOH0Dk08tC0KvU40SHdhOqXPkvIWGetPJpO8aC EorS6q1wQGC8ZScaydoK+G/dcH0U4QY3oAxhVvLxl7sBvQ/hQzhO1oNgvGW9yGSN5T dgok6CPO0pZhwkTpfTYCvL3cqXmV2LiAqOPp3GQ8= 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 5.8 28/38] leds: lm3533: fix use-after-free on unbind Date: Mon, 10 Aug 2020 17:19:18 +0200 Message-Id: <20200810151805.287213549@linuxfoundation.org> X-Mailer: git-send-email 2.28.0 In-Reply-To: <20200810151803.920113428@linuxfoundation.org> References: <20200810151803.920113428@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 d584221e683bbd173738603b83a315f27d27d043 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: 50154e29e5cc ("leds: lm3533: 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-lm3533.c | 12 +++++++++--- 1 file changed, 9 insertions(+), 3 deletions(-) --- a/drivers/leds/leds-lm3533.c +++ b/drivers/leds/leds-lm3533.c @@ -694,7 +694,7 @@ static int lm3533_led_probe(struct platf platform_set_drvdata(pdev, led); - ret = devm_led_classdev_register(pdev->dev.parent, &led->cdev); + ret = led_classdev_register(pdev->dev.parent, &led->cdev); if (ret) { dev_err(&pdev->dev, "failed to register LED %d\n", pdev->id); return ret; @@ -704,13 +704,18 @@ static int lm3533_led_probe(struct platf ret = lm3533_led_setup(led, pdata); if (ret) - return ret; + goto err_deregister; ret = lm3533_ctrlbank_enable(&led->cb); if (ret) - return ret; + goto err_deregister; return 0; + +err_deregister: + led_classdev_unregister(&led->cdev); + + return ret; } static int lm3533_led_remove(struct platform_device *pdev) @@ -720,6 +725,7 @@ static int lm3533_led_remove(struct plat dev_dbg(&pdev->dev, "%s\n", __func__); lm3533_ctrlbank_disable(&led->cb); + led_classdev_unregister(&led->cdev); return 0; }