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emacs 27.2 From: Petr Machata To: "Ziyang Xuan (William)" CC: Jakub Kicinski , Petr Machata , , , , Subject: Re: [PATCH net v2] net: vlan: fix a UAF in vlan_dev_real_dev() In-Reply-To: Message-ID: <8735nstq62.fsf@nvidia.com> Date: Fri, 19 Nov 2021 11:07:01 +0100 MIME-Version: 1.0 Content-Type: text/plain X-Originating-IP: [172.20.187.5] X-ClientProxiedBy: HQMAIL111.nvidia.com (172.20.187.18) To HQMAIL107.nvidia.com (172.20.187.13) X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-Correlation-Id: 0087db48-3a65-4174-73d3-08d9ab445763 X-MS-TrafficTypeDiagnostic: SA0PR12MB4366: X-Microsoft-Antispam-PRVS: X-MS-Oob-TLC-OOBClassifiers: OLM:8882; X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; X-Microsoft-Antispam-Message-Info: 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 X-Forefront-Antispam-Report: CIP:216.228.112.34;CTRY:US;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:mail.nvidia.com;PTR:schybrid03.nvidia.com;CAT:NONE;SFS:(4636009)(46966006)(36840700001)(426003)(4744005)(2616005)(5660300002)(86362001)(336012)(54906003)(36906005)(6916009)(47076005)(70586007)(8936002)(36860700001)(4326008)(186003)(26005)(16526019)(2906002)(316002)(508600001)(36756003)(356005)(7636003)(70206006)(8676002)(82310400003);DIR:OUT;SFP:1101; X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 19 Nov 2021 10:07:06.0787 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 0087db48-3a65-4174-73d3-08d9ab445763 X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=43083d15-7273-40c1-b7db-39efd9ccc17a;Ip=[216.228.112.34];Helo=[mail.nvidia.com] X-MS-Exchange-CrossTenant-AuthSource: DM6NAM11FT014.eop-nam11.prod.protection.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: SA0PR12MB4366 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Ziyang Xuan (William) writes: > I need some time to test my some ideas. And anyone has good ideas, please > do not be stingy. Jakub Kicinski writes: > I think we should move the dev_hold() to ndo_init(), otherwise it's > hard to reason if destructor was invoked or not if > register_netdevice() errors out. That makes sense to me. We always put real_dev in the destructor, so we should always hold it in the constructor...