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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id C917CC3A59D for ; Mon, 24 Oct 2022 06:54:17 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230121AbiJXGyP (ORCPT ); Mon, 24 Oct 2022 02:54:15 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:48668 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230217AbiJXGyG (ORCPT ); Mon, 24 Oct 2022 02:54:06 -0400 Received: from szxga02-in.huawei.com (szxga02-in.huawei.com [45.249.212.188]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 3CE2C5B73B for ; Sun, 23 Oct 2022 23:54:02 -0700 (PDT) Received: from dggpemm500022.china.huawei.com (unknown [172.30.72.55]) by szxga02-in.huawei.com (SkyGuard) with ESMTP id 4Mwm4s0W3rzHv6T; Mon, 24 Oct 2022 14:53:49 +0800 (CST) Received: from dggpemm100009.china.huawei.com (7.185.36.113) by dggpemm500022.china.huawei.com (7.185.36.162) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2375.31; Mon, 24 Oct 2022 14:53:59 +0800 Received: from huawei.com (10.175.113.32) by dggpemm100009.china.huawei.com (7.185.36.113) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2375.31; Mon, 24 Oct 2022 14:53:59 +0800 From: Liu Shixin To: Christoph Lameter , Pekka Enberg , "David Rientjes" , Joonsoo Kim , "Andrew Morton" , Vlastimil Babka , "Roman Gushchin" , Hyeonggon Yoo <42.hyeyoo@gmail.com> CC: , , Liu Shixin Subject: [PATCH 0/4] Refactor __kmem_cache_create() and fix memory leak Date: Mon, 24 Oct 2022 15:42:28 +0800 Message-ID: <20221024074232.151383-1-liushixin2@huawei.com> X-Mailer: git-send-email 2.25.1 MIME-Version: 1.0 Content-Transfer-Encoding: 7BIT Content-Type: text/plain; charset=US-ASCII X-Originating-IP: [10.175.113.32] X-ClientProxiedBy: dggems703-chm.china.huawei.com (10.3.19.180) To dggpemm100009.china.huawei.com (7.185.36.113) X-CFilter-Loop: Reflected Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org I found a memory leak of kobj->name in sysfs_slab_add() which is introduced by 80da026a8e5d ("mm/slub: fix slab double-free in case of duplicate sysfs filename"). Following the rules stated in the comment for kobject_init_and_add(): If this function returns an error, kobject_put() must be called to properly clean up the memory associated with the object. We should use kobject_put() to free kobject. But we can't simply add kobject_put() since it will free kmem_cache too. If we use kobject_put(), we need to skip other release functions. In this series, We refactor the code to separate sysfs_slab_add() and debugfs_slab_add() from __kmem_cache_create(), and then use kobject_put() to free kobject in sysfs_slab_add(). This can fix the memory leak of kobject->name. Liu Shixin (4): mm/slab_common: Move cache_name to create_cache() mm/slub: rename kmem_cache_release to slab_release in slub.c mm/slab_common: Separate sysfs_slab_add() and debugfs_slab_add() from __kmem_cache_create() mm/slab_common: Fix memory leak of kobj->name in sysfs_slab_add() include/linux/slub_def.h | 11 ++++++++ mm/slab_common.c | 42 ++++++++++++++++-------------- mm/slub.c | 56 +++++++++++----------------------------- 3 files changed, 48 insertions(+), 61 deletions(-) -- 2.25.1