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"Hongling Zeng" , , , , , , , , , , From: "Zi Yan" Subject: Re: [PATCH v2] mm: huge_memory: Fix kobject cleanup in thpsize_create error X-Mailer: aerc 0.21.0 References: <20260713054154.120915-1-zenghongling@kylinos.cn> In-Reply-To: <20260713054154.120915-1-zenghongling@kylinos.cn> X-ClientProxiedBy: BN9PR03CA0300.namprd03.prod.outlook.com (2603:10b6:408:f5::35) To IA0PR12MB8374.namprd12.prod.outlook.com (2603:10b6:208:40e::7) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: IA0PR12MB8374:EE_|SJ2PR12MB8689:EE_ X-MS-Office365-Filtering-Correlation-Id: 6235de20-cdbc-47c5-223e-08dee20cf0b2 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|7416014|376014|23010399003|1800799024|366016|18002099003|22082099003|921020|6133799003|56012099006|11063799006; X-Microsoft-Antispam-Message-Info: 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If the subsequent kobject_add() > fails, the kobject has still been initialized and must be cleaned up > via the reference count mechanism (kobject_put), not direct kfree(). > > Direct kfree() leaves the kobject's internal state (including the > reference count and kset membership) uncleaned, which can cause: > - Memory leaks of kobject internal structures > - Potential use-after-free if there are pending references > - Inconsistent state with the rest of the error handling code > > This fix matches the pattern used elsewhere in the kernel and in the > same function (err_put label) which correctly uses kobject_put(). > > Fixes: 3485b88390b0 ("mm: thp: introduce multi-size THP sysfs interface") > Signed-off-by: Hongling Zeng > Suggested-by: Baolin Wang > > --- > Change in v2: > - Use goto err_put instead of kobject_put() + goto err for consistency > - Add suggested > --- > mm/huge_memory.c | 6 ++---- > 1 file changed, 2 insertions(+), 4 deletions(-) > LGTM. Acked-by: Zi Yan --=20 Best Regards, Yan, Zi