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Mon, 10 Feb 2025 14:47:12 +0000 Date: Mon, 10 Feb 2025 22:47:05 +0800 From: Philip Li To: Waiman Long CC: kernel test robot , , , "Paul E. McKenney" Subject: Re: net/8021q/vlan.c:241:46: warning: '%.4i' directive output may be truncated writing between 4 and 5 bytes into a region of size between 0 and 15 Message-ID: References: <202502101253.TDZbCYh6-lkp@intel.com> <3008ca8d-e599-437b-8f1e-0dbe86202f38@redhat.com> Content-Type: text/plain; charset="us-ascii" Content-Disposition: inline In-Reply-To: <3008ca8d-e599-437b-8f1e-0dbe86202f38@redhat.com> X-ClientProxiedBy: SG2PR04CA0172.apcprd04.prod.outlook.com (2603:1096:4::34) To DM4PR11MB5423.namprd11.prod.outlook.com (2603:10b6:5:39b::20) Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: DM4PR11MB5423:EE_|PH8PR11MB6732:EE_ X-MS-Office365-Filtering-Correlation-Id: f6b2dcee-3bc4-4183-9189-08dd49e1cda6 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|1800799024|376014|366016; X-Microsoft-Antispam-Message-Info: =?us-ascii?Q?L/fe7XX8DNbIbY6NDonUfegCyTPXBb5XLlYKX9fFHF5S/h87StxsQaqPIZus?= =?us-ascii?Q?sU0SgAQ+tMCZf7iCJdTxj2HWxPnxfaL3Nyt+ZZjcp3TDBqEOHEvFcIUNqPQy?= =?us-ascii?Q?ZUXnywUV0JKbA3hAVSMMMWwK4BwmW9oUZPLUq88mkwnJV2PHkJnPM0x+TGPf?= =?us-ascii?Q?ZYWz2Pjvz+syA5WgYhxPQlt7cLtLPvCxltGOdN2r3ylkWAjQrFT15MPuOSqZ?= =?us-ascii?Q?gY27+baWKeIg3Dcdt47bO6VH3ptCeThX2k8nJJYzvy/HxNDr2NqskoLE2emn?= =?us-ascii?Q?YBq4nWKgSruCGfWLmL7xuP1Chggmk+bfqw2szuOuxArHOA45Ote1GXfgJc35?= =?us-ascii?Q?MvXFjO6YeR0tREkRk1ujDIG+N/pwIvA+lyzGY46chplUHVgNezqNHdAqYHQT?= =?us-ascii?Q?xSWFda1mBjtBQ+qfho9VQu5yxk3AajdaAqFvz+kZVPa5IgsmRW/5FSpCIWS9?= =?us-ascii?Q?/+TNhaLqmn5N2rCa+d6SE8mU4yPjYojcQ6PuIJ6OKjmCbOnn+60pMAwqjyGk?= =?us-ascii?Q?nLBaOQFXIcv/KLoR8pa6ImOHhFeF6Hkyc5HnubuZRthGP8o5melY8y+1f3/a?= =?us-ascii?Q?pFE5SdExCBQsEAcQMWXsxT8YgJguYchu6PEkto0nItnJNRPjGtoyf2yjGYBp?= =?us-ascii?Q?7FEv7UUPTCpVSJbAytwcTDntj8tzPz6eIL2ogY6uTG4MMCmoIha0IFEL34Eo?= =?us-ascii?Q?6y4b3kT9ug/d4D2VL675qeP4XS6FBA2yvRK4nDuqaXHgDLTdukrK/yFc4Qak?= =?us-ascii?Q?xnkwDJN3XGlSiIgoaXyF8caMW23VV2SEwHQxRVoKfZ2x3izuyTm1OFNzDpDR?= =?us-ascii?Q?3VylKxtz51Cj4OFNuMZONHN9PBzjyPUbMGq5W4ND2mF1CDEM2Q1kT7V61RQ+?= =?us-ascii?Q?UapXkkTAqphpdRWrO2UhrizAmPGpXE9VDJDFuLdO1OqsoR8GeeF5Seqfj3pY?= =?us-ascii?Q?OpTxtI/iS26WANHShe7OerivOucf6aj3aMpRVZ7023oSBur3YgKgETYQZVTF?= =?us-ascii?Q?gxl/BSVzNmoKJUl9BX51P0xXqV2Vn35iJ1nz6TfjvpZsPlJFqOo+6LNM+ghw?= =?us-ascii?Q?RsQON4FogLjD6CW1U8WwwVGrQ4EKOBHMbewkOnDc6k1XelFFk5EIQ9ztW85I?= =?us-ascii?Q?bFC/rmNdrZ/XwIHjJ1H/wXq2fShH6AIQyOPRqWEaH9xzImyQk5FArsvm/WJ8?= =?us-ascii?Q?c+oT5maevTSCPxa/VD0hG4klGDkML0W7uLdKHT+ynnT8kCOgvF+87JbjRIri?= =?us-ascii?Q?3prjI1FFNI+kLfR6rz2YmrD65sa0HTqnLfH9mLI39BHFks5kdljjKcJ1qywC?= =?us-ascii?Q?56JR8XLF0TuxJADzsWMRh2qRd/JRZ1rJUROgGCzVj3mxEQ=3D=3D?= X-Forefront-Antispam-Report: CIP:255.255.255.255;CTRY:;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:DM4PR11MB5423.namprd11.prod.outlook.com;PTR:;CAT:NONE;SFS:(13230040)(1800799024)(376014)(366016);DIR:OUT;SFP:1101; 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> > | ^~ > > In function 'register_vlan_device', > > inlined from 'vlan_ioctl_handler' at net/8021q/vlan.c:628:9: > > net/8021q/vlan.c:253:42: note: directive argument in the range [0, 65535] > > 253 | snprintf(name, IFNAMSIZ, "%s.%i", real_dev->name, vlan_id); > > | ^~~~~~~ > > net/8021q/vlan.c:253:17: note: 'snprintf' output between 3 and 22 bytes into a destination of size 16 > > 253 | snprintf(name, IFNAMSIZ, "%s.%i", real_dev->name, vlan_id); > > | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ > > net/8021q/vlan.c: In function 'vlan_ioctl_handler': > > > > net/8021q/vlan.c:241:46: warning: '%.4i' directive output may be truncated writing between 4 and 5 bytes into a region of size between 0 and 15 [-Wformat-truncation=] > > 241 | snprintf(name, IFNAMSIZ, "%s.%.4i", real_dev->name, vlan_id); > > | ^~~~ > > In function 'register_vlan_device', > > inlined from 'vlan_ioctl_handler' at net/8021q/vlan.c:628:9: > > net/8021q/vlan.c:241:42: note: directive argument in the range [0, 65535] > > 241 | snprintf(name, IFNAMSIZ, "%s.%.4i", real_dev->name, vlan_id); > > | ^~~~~~~~~ > > net/8021q/vlan.c:241:17: note: 'snprintf' output between 6 and 22 bytes into a destination of size 16 > > 241 | snprintf(name, IFNAMSIZ, "%s.%.4i", real_dev->name, vlan_id); > > | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ > > > > > > vim +241 net/8021q/vlan.c > > Why me? I have never touched net/8021q/vlan.c and I don't believe commit > 925da92ba5cb ("rcu: Avoid unneeded function call in rcu_read_unlock()") has > anything to do with the snprintf format warnings. Sorry about this, this is a wrong report and we will fix the bug in the bot side asap. Sorry for any inconvenience. > > Regards, > Longman > >