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=-9.8 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=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 6E7B5C433DF for ; Thu, 20 Aug 2020 10:07:56 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 435252078D for ; Thu, 20 Aug 2020 10:07:56 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1597918076; bh=sB3O8RsK+WNH9GoiGeAlv0G4heZHl6LbPgI8bJi86mo=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=hb2ljYJzeDgmY9/e0x2gFQgLmHGmbLz6dzLl0oeE+ZuBlpnsxuQKBbLsNSgmZHr0J e939PvUwZKQpWicJMCgIRg6EnmuoORueTT0PZ3mnQ8GuyGbm+NVfrNXfXdlgqXyeEq zQr0XGY1Mg7AxYzuOkENrq/Bv65I4cc+pCPkBVcI= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730679AbgHTKHp (ORCPT ); Thu, 20 Aug 2020 06:07:45 -0400 Received: from mail.kernel.org ([198.145.29.99]:35292 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1730667AbgHTKGb (ORCPT ); Thu, 20 Aug 2020 06:06:31 -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 178C0206DA; Thu, 20 Aug 2020 10:06:29 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1597917990; bh=sB3O8RsK+WNH9GoiGeAlv0G4heZHl6LbPgI8bJi86mo=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=tK/qHgq6ZRpESF9NoH+gt8gp7AFjBeU6jmayOG6SzpbTSsxycprNKlngV9Zi4Rwxa hTV5xu8TgzpJyYgnMn1QVmQE5Sx1iFu/8gQYYM3pSK/AVrBo5A/A+RRciS+MaiiDFO gYDbaN5ZjqmOoZSAioheskfB+GXlRjRqWw++/vWg= 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 4.14 015/228] leds: wm831x-status: fix use-after-free on unbind Date: Thu, 20 Aug 2020 11:19:50 +0200 Message-Id: <20200820091608.294236424@linuxfoundation.org> X-Mailer: git-send-email 2.28.0 In-Reply-To: <20200820091607.532711107@linuxfoundation.org> References: <20200820091607.532711107@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 47a459ecc800a17109d0c496a4e21e478806ee40 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: 8d3b6a4001ce ("leds: wm831x-status: 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-wm831x-status.c | 14 +++++++++++++- 1 file changed, 13 insertions(+), 1 deletion(-) --- a/drivers/leds/leds-wm831x-status.c +++ b/drivers/leds/leds-wm831x-status.c @@ -283,12 +283,23 @@ static int wm831x_status_probe(struct pl drvdata->cdev.blink_set = wm831x_status_blink_set; drvdata->cdev.groups = wm831x_status_groups; - ret = devm_led_classdev_register(wm831x->dev, &drvdata->cdev); + ret = led_classdev_register(wm831x->dev, &drvdata->cdev); if (ret < 0) { dev_err(&pdev->dev, "Failed to register LED: %d\n", ret); return ret; } + platform_set_drvdata(pdev, drvdata); + + return 0; +} + +static int wm831x_status_remove(struct platform_device *pdev) +{ + struct wm831x_status *drvdata = platform_get_drvdata(pdev); + + led_classdev_unregister(&drvdata->cdev); + return 0; } @@ -297,6 +308,7 @@ static struct platform_driver wm831x_sta .name = "wm831x-status", }, .probe = wm831x_status_probe, + .remove = wm831x_status_remove, }; module_platform_driver(wm831x_status_driver);