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 Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id C8129C982FF for ; Tue, 22 Sep 2026 12:48:43 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:Content-Type:MIME-Version: References:Message-ID:In-Reply-To:Subject:cc:To:Date:From:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=QPF+ayuwPNkxuj/ujS1fxH31P6rprrzyBlOR3aJvTXs=; b=fiBQ1/K53EmTXpQ/9efuXP3bPH Fh2bdxEfwVksgrWaijyocmUSVpbR8tiDHXQMEyxz6jCEuZiaK0z2vpTwacxAx09ykPU5/E5rGHrx5 o1chu5BLXMVU/KOLw2EKIOFcoHL4n0btKK29Q5opgSDJEwehUJbtBe6wV/TTkxDaDwSR859/l3IB1 wYMgJFDze8G1VSGJ0R30VT9bgDN3N/Rg+yMMT77+lzu6XwZ2iaicmJZHfHMjAVc2SnDfD/z+vb2KP zd5fxSaCifKiwaw+fk3cbypGsf89kxUMqAbfAVy9FLVUILvJ981LRzJS4ISQ0ptyz6a1m9uXnbjdQ dQ4OpEjQ==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.99.1 #2 (Red Hat Linux)) id 1x8zvJ-00000005MIj-39tY; Tue, 22 Sep 2026 12:48:37 +0000 Received: from mgamail.intel.com ([192.198.163.15]) by bombadil.infradead.org with esmtps (Exim 4.99.1 #2 (Red Hat Linux)) id 1x8zvH-00000005MI5-1tYC for linux-arm-kernel@lists.infradead.org; Tue, 22 Sep 2026 12:48:36 +0000 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1790081315; x=1821617315; h=from:date:to:cc:subject:in-reply-to:message-id: references:mime-version; bh=qpF5www/qPUXSNZo2UHhbjLD5x+pblk2MWF/eef8p7I=; b=ggRV/+t6rkMcSi5yHn4cGG0U2Fon7SDCUFWO0eLQjBmP3h4j17DENuqq 2IfALFjN2ZHnHpItjBh7hSpb1WuZI/kXFNbFMb0p5wcXDLlaGKGj5wDu1 D2kTCcdsUOtxoUaYM/w1Tkfz0nls7kC+4ssUOj8XGPjInjwfM837nFPOL /1EYotmCXPC9lhfFxOe4QTorb5/kAlZt0sTAX4q3pMuJvGjJzu0rqGD4h 6KLnyKHtOA2IBuXfv9RV/jcNIryeAaqHyW7TSkybxwrgK7Fd4q9FxCrkE T2mqR3Y0vcwnfxE0LbOb3WfYF2r0+DlzlP7dCHPSJJQWgmX+E0LHIeLBS A==; X-CSE-ConnectionGUID: 2AXAm6rqQvKWWzemttH5Rw== X-CSE-MsgGUID: 9uxcwEtrSPOnlKwzpETNKQ== X-IronPort-AV: E=McAfee;i="6800,10657,11912"; a="90796983" X-IronPort-AV: E=Sophos;i="6.27,116,1787036400"; d="scan'208";a="90796983" Received: from fmviesa001.fm.intel.com ([10.60.135.141]) by fmvoesa109.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 22 Sep 2026 05:48:34 -0700 X-CSE-ConnectionGUID: I61J/lMPR6yWm2SobW9uzQ== X-CSE-MsgGUID: Y5GxCWZmT3qY5hE+HY8CAQ== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.27,116,1787036400"; d="scan'208";a="301039531" Received: from ijarvine-mobl1.ger.corp.intel.com (HELO localhost) ([10.245.245.80]) by smtpauth.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 22 Sep 2026 05:48:21 -0700 From: =?UTF-8?q?Ilpo=20J=C3=A4rvinen?= Date: Tue, 22 Sep 2026 15:48:19 +0300 (EEST) To: "Rafael J. Wysocki" cc: Linux ACPI , LKML , Andy Shevchenko , Mika Westerberg , Lorenzo Pieralisi , Hanjun Guo , Sudeep Holla , linux-arm-kernel@lists.infradead.org, Ard Biesheuvel , Ilias Apalodimas , linux-efi@vger.kernel.org, Will Deacon , Robin Murphy , "Joerg Roedel (AMD)" , Mark Pearson , "Derek J. Clark" , Hans de Goede , platform-driver-x86@vger.kernel.org, David Rhodes , Richard Fitzgerald , Jaroslav Kysela , Takashi Iwai , linux-sound@vger.kernel.org, Shenghao Ding , Kevin Lu , Baojun Xu , Sen Wang , Vijendar Mukunda , Venkata Prasad Potturu , Liam Girdwood , Mark Brown , Cezary Rojewski , Peter Ujfalusi , Bard Liao , Kai Vehmanen , Pierre-Louis Bossart , Binbin Zhou , Andreas Noever , Mika Westerberg , Yehezkel Bernat Subject: Re: [PATCH v1 06/17] platform/x86: serdev_helpers: Switch to use acpi_bus_get_primary_device() In-Reply-To: <2720286.Lt9SDvczpP@rafael.j.wysocki> Message-ID: <5fa97997-ae1f-0ff3-918c-e3195164c2ef@linux.intel.com> References: <7995179.EvYhyI6sBW@rafael.j.wysocki> <2720286.Lt9SDvczpP@rafael.j.wysocki> MIME-Version: 1.0 Content-Type: multipart/mixed; boundary="8323328-1862122475-1790081299=:1233" X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.9.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260922_054835_501145_ADBF8E57 X-CRM114-Status: GOOD ( 16.81 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org This message is in MIME format. The first part should be readable text, while the remaining parts are likely unreadable without MIME-aware tools. --8323328-1862122475-1790081299=:1233 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: QUOTED-PRINTABLE On Mon, 21 Sep 2026, Rafael J. Wysocki wrote: > From: "Rafael J. Wysocki" >=20 > Replace acpi_get_first_physical_node() that is slated for removal > with acpi_bus_get_primary_device() that takes a reference to the > device it is about to return. >=20 > This addresses a potential use-after-free that may occur if the > device returned by acpi_get_first_physical_node() is removed right > after dropping its ACPI companion's physical_node_lock in that > function. >=20 > Signed-off-by: Rafael J. Wysocki > --- > drivers/platform/x86/serdev_helpers.h | 3 +-- > 1 file changed, 1 insertion(+), 2 deletions(-) >=20 > diff --git a/drivers/platform/x86/serdev_helpers.h b/drivers/platform/x86= /serdev_helpers.h > index 57eac75805e2..20267e1941f1 100644 > --- a/drivers/platform/x86/serdev_helpers.h > +++ b/drivers/platform/x86/serdev_helpers.h > @@ -74,8 +74,7 @@ get_serdev_controller(const char *serial_ctrl_hid, > =09=09return ERR_PTR(-ENODEV); > =09} > =20 > -=09/* get_first_physical_node() returns a weak ref */ > -=09parent =3D get_device(acpi_get_first_physical_node(adev)); > +=09parent =3D acpi_bus_get_primary_device(adev); > =09acpi_dev_put(adev); > =09if (!parent) { > =09=09pr_err("error could not get %s/%s serial-ctrl physical node\n", >=20 Reviewed-by: Ilpo J=C3=A4rvinen --=20 i. --8323328-1862122475-1790081299=:1233--