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Wed, 30 Sep 2026 14:54:03 -0700 Received: from nvidia.com (10.127.8.11) by mail.nvidia.com (10.126.190.182) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.2562.49 via Frontend Transport; Wed, 30 Sep 2026 14:54:01 -0700 Date: Wed, 30 Sep 2026 14:53:59 -0700 From: Nicolin Chen To: "Rafael J. Wysocki" CC: Linux ACPI , , , LKML , Andy Shevchenko , Sudeep Holla , Ard Biesheuvel , Ilias Apalodimas , , Will Deacon , "Joerg Roedel (AMD)" , Jaroslav Kysela , Takashi Iwai , Robin Murphy , David Rhodes , "Richard Fitzgerald" , , , Shenghao Ding , "Kevin Lu" , Baojun Xu , Sen Wang Subject: Re: [PATCH v2 2/5] iommu/arm-smmu-v3: Switch to use acpi_bus_get_primary_device() Message-ID: References: <4766532.LvFx2qVVIh@rafael.j.wysocki> <3636226.QJadu78ljV@rafael.j.wysocki> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Disposition: inline In-Reply-To: <3636226.QJadu78ljV@rafael.j.wysocki> X-NV-OnPremToCloud: ExternallySecured X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: SA2PEPF00003F66:EE_|MW4PR12MB6949:EE_ X-MS-Office365-Filtering-Correlation-Id: 45b8fb49-1de2-434b-4ab2-08df1f3d61ec X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|376014|82310400026|36860700016|1800799024|7416014|23010399003|10067099003|56012099006|11063799006|4143699003|18002099003|22082099003; X-Microsoft-Antispam-Message-Info: +UzUlv4rzrjoBpgt94HZwEwbdi3XapHjLfCeVOqxVn/YTdzqN38xDxUOSjNkA+++vVhLXg/cVcp0rToJReIjdo6TyOGWDOrDrAXGgCf5zFWo3LXky/Zc9HSXYYdStirx0Mh0i4LFeM4IQmvdNjjiLgNh3TwtkHcZ+++W8dEnj06uo1xkx0GsKFkrapexPCEszDpmN5QsUg403/FQ7te6vYHXFFa+XyJLHQ3mM+Xnx3EO1wFru8mUNkkEiYJE7gKLvP/+HY4JkhmLG3+jNBo3xt68N1i4CXzSXRZtRbqQUFrkTm4HZz9l2EV7MFeOcx8U+yA0bsO7ik1xiC4vLN8/L8c6OMRToVoqv8htHX5U8oC9VPr8AYv2aPZIgnQswrwSc/fsRetF4hL3XVT4i3tIk0kx9s7pAqw8ihfhXp1IlNfCjv22yCjJor22RXAgqYF2JwYOFOeEXB5OThvty4o3QpbQMc8Rk2tCFdm0tHT5whWIYUcoE3Cyddg2Uj+xR3jNA3j2vvdhHsnFCWyE+koT+b0HCqdC2XVhxrWEjkDYx3T7v3yLoyVuBUtn/awtOd9EucfN10q7KK7Q+6ScDtQNTCB1qMIHxALacxbE/6Oq6r8gKMtKvZcd2rdVYLDNslS83pCP8LQaSeBHvWnhbP7k+p/6qsygg+VOji6d1z/FulSMUygEN6AtwsRGnDwBsU5AYL8fi1C99T5Y0iiGVawOGw== X-Forefront-Antispam-Report: CIP:216.228.118.233;CTRY:US;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:mail.nvidia.com;PTR:dc7edge2.nvidia.com;CAT:NONE;SFS:(13230040)(376014)(82310400026)(36860700016)(1800799024)(7416014)(23010399003)(10067099003)(56012099006)(11063799006)(4143699003)(18002099003)(22082099003);DIR:OUT;SFP:1101; X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: eBjgD+aQuSD39KZLc2fZvdmAOMavwT3wm38oevmw/OP2LGEXvAsEshXdF7PBpfwAyJc3gWPKaJuxLDEtGo8WelYiBQQRgqStY/eNp+bi11sefpCDwly19U/rjeKhX2wQVzP878kxM0ZXvKNFsHTzeQOK6jvoOZMWi5LreqMxh7zmFKGNC4rEA6KmSLc99vUtDJ7YzRlMcW3aZU1q0wDo0b9Veo2gNrC3Ke6B1A1nfzB83AdnvyWA1KSdqnCXEaWDHzDSdd4bDJEgubWKDZNNHbgsfxHxQ4mgNG36sZnjntsolz1MfeNGlJlhiN1Ztr10FvurTVLG+2F4xFVeCf5rUViGw6OxniN/IvZICGK/31AInqEWWAVXUetyuXIA2MHuN76NIU4OvOesel+wGZfaR04RIvLPbt2CL9PlKW886lrM790TzYx7j3MN5uROUikG X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 30 Sep 2026 21:54:20.5165 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 45b8fb49-1de2-434b-4ab2-08df1f3d61ec X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=43083d15-7273-40c1-b7db-39efd9ccc17a;Ip=[216.228.118.233];Helo=[mail.nvidia.com] X-MS-Exchange-CrossTenant-AuthSource: SA2PEPF00003F66.namprd04.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: MW4PR12MB6949 On Wed, Sep 30, 2026 at 08:43:03PM +0200, Rafael J. Wysocki wrote: > From: "Rafael J. Wysocki" > > 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. > > 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. > > Signed-off-by: Rafael J. Wysocki Reviewed-by: Nicolin Chen