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 X-Spam-Level: X-Spam-Status: No, score=-19.4 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 2A3FEC433F5 for ; Mon, 13 Sep 2021 22:41:39 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 13C6860EE5 for ; Mon, 13 Sep 2021 22:41:39 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1348708AbhIMWmx (ORCPT ); Mon, 13 Sep 2021 18:42:53 -0400 Received: from mail.kernel.org ([198.145.29.99]:51756 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1344391AbhIMWkz (ORCPT ); Mon, 13 Sep 2021 18:40:55 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id 36EFC6136F; Mon, 13 Sep 2021 22:36:05 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1631572566; bh=rjUzc31mYN/iwJJ7u2RwyAx48k5rjUdwS0eIsz5aehE=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=lAwlujzQ3M5dCkqIgPcHODV1MFhANcUTHargM9j8pROde7ckfU64y8pqVLvBpvOAz PNVVGS/C3Fsa+cEDRZ6rYrl1zegtFs2KkNxEuQ3SELgb2yIlgZZSQyhPhrAN1SmC6C y8xyDWxIDc1W8wGKmhV3MTXXMbJxIJei4Kysyx3JJZsoZt/pyfI0RpTuAnD5qC2QBa 95ni9ANMQUyZEWAHjmDuiv05Kpz3tXaNIZK+TPTHv29LjeGxeYIV+vSW9G2IEGxbpA j3cSKWWpJ4QVjJnAsTv1v1iMifvx1nYkLpNx4+B4ZDeT58jpYbzdep5XdS773iZ+pO 2CO5Zep8FeXpw== From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Nanyong Sun , Hulk Robot , Ryusuke Konishi , Andrew Morton , Linus Torvalds , Sasha Levin , linux-nilfs@vger.kernel.org Subject: [PATCH AUTOSEL 4.4 3/8] nilfs2: fix memory leak in nilfs_sysfs_create_device_group Date: Mon, 13 Sep 2021 18:35:56 -0400 Message-Id: <20210913223601.436675-3-sashal@kernel.org> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20210913223601.436675-1-sashal@kernel.org> References: <20210913223601.436675-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Nanyong Sun [ Upstream commit 5f5dec07aca7067216ed4c1342e464e7307a9197 ] Patch series "nilfs2: fix incorrect usage of kobject". This patchset from Nanyong Sun fixes memory leak issues and a NULL pointer dereference issue caused by incorrect usage of kboject in nilfs2 sysfs implementation. This patch (of 6): Reported by syzkaller: BUG: memory leak unreferenced object 0xffff888100ca8988 (size 8): comm "syz-executor.1", pid 1930, jiffies 4294745569 (age 18.052s) hex dump (first 8 bytes): 6c 6f 6f 70 31 00 ff ff loop1... backtrace: kstrdup+0x36/0x70 mm/util.c:60 kstrdup_const+0x35/0x60 mm/util.c:83 kvasprintf_const+0xf1/0x180 lib/kasprintf.c:48 kobject_set_name_vargs+0x56/0x150 lib/kobject.c:289 kobject_add_varg lib/kobject.c:384 [inline] kobject_init_and_add+0xc9/0x150 lib/kobject.c:473 nilfs_sysfs_create_device_group+0x150/0x7d0 fs/nilfs2/sysfs.c:986 init_nilfs+0xa21/0xea0 fs/nilfs2/the_nilfs.c:637 nilfs_fill_super fs/nilfs2/super.c:1046 [inline] nilfs_mount+0x7b4/0xe80 fs/nilfs2/super.c:1316 legacy_get_tree+0x105/0x210 fs/fs_context.c:592 vfs_get_tree+0x8e/0x2d0 fs/super.c:1498 do_new_mount fs/namespace.c:2905 [inline] path_mount+0xf9b/0x1990 fs/namespace.c:3235 do_mount+0xea/0x100 fs/namespace.c:3248 __do_sys_mount fs/namespace.c:3456 [inline] __se_sys_mount fs/namespace.c:3433 [inline] __x64_sys_mount+0x14b/0x1f0 fs/namespace.c:3433 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3b/0x90 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae If kobject_init_and_add return with error, then the cleanup of kobject is needed because memory may be allocated in kobject_init_and_add without freeing. And the place of cleanup_dev_kobject should use kobject_put to free the memory associated with the kobject. As the section "Kobject removal" of "Documentation/core-api/kobject.rst" says, kobject_del() just makes the kobject "invisible", but it is not cleaned up. And no more cleanup will do after cleanup_dev_kobject, so kobject_put is needed here. Link: https://lkml.kernel.org/r/1625651306-10829-1-git-send-email-konishi.ryusuke@gmail.com Link: https://lkml.kernel.org/r/1625651306-10829-2-git-send-email-konishi.ryusuke@gmail.com Reported-by: Hulk Robot Link: https://lkml.kernel.org/r/20210629022556.3985106-2-sunnanyong@huawei.com Signed-off-by: Nanyong Sun Signed-off-by: Ryusuke Konishi Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds Signed-off-by: Sasha Levin --- fs/nilfs2/sysfs.c | 6 ++---- 1 file changed, 2 insertions(+), 4 deletions(-) diff --git a/fs/nilfs2/sysfs.c b/fs/nilfs2/sysfs.c index c3b629eec294..69a8f302170e 100644 --- a/fs/nilfs2/sysfs.c +++ b/fs/nilfs2/sysfs.c @@ -1008,7 +1008,7 @@ int nilfs_sysfs_create_device_group(struct super_block *sb) err = kobject_init_and_add(&nilfs->ns_dev_kobj, &nilfs_dev_ktype, NULL, "%s", sb->s_id); if (err) - goto free_dev_subgroups; + goto cleanup_dev_kobject; err = nilfs_sysfs_create_mounted_snapshots_group(nilfs); if (err) @@ -1045,9 +1045,7 @@ int nilfs_sysfs_create_device_group(struct super_block *sb) nilfs_sysfs_delete_mounted_snapshots_group(nilfs); cleanup_dev_kobject: - kobject_del(&nilfs->ns_dev_kobj); - -free_dev_subgroups: + kobject_put(&nilfs->ns_dev_kobj); kfree(nilfs->ns_dev_subgroups); failed_create_device_group: -- 2.30.2 From mboxrd@z Thu Jan 1 00:00:00 1970 From: Sasha Levin Subject: [PATCH AUTOSEL 4.4 3/8] nilfs2: fix memory leak in nilfs_sysfs_create_device_group Date: Mon, 13 Sep 2021 18:35:56 -0400 Message-ID: <20210913223601.436675-3-sashal@kernel.org> References: <20210913223601.436675-1-sashal@kernel.org> Mime-Version: 1.0 Content-Transfer-Encoding: 8bit Return-path: DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1631572566; bh=rjUzc31mYN/iwJJ7u2RwyAx48k5rjUdwS0eIsz5aehE=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=lAwlujzQ3M5dCkqIgPcHODV1MFhANcUTHargM9j8pROde7ckfU64y8pqVLvBpvOAz PNVVGS/C3Fsa+cEDRZ6rYrl1zegtFs2KkNxEuQ3SELgb2yIlgZZSQyhPhrAN1SmC6C y8xyDWxIDc1W8wGKmhV3MTXXMbJxIJei4Kysyx3JJZsoZt/pyfI0RpTuAnD5qC2QBa 95ni9ANMQUyZEWAHjmDuiv05Kpz3tXaNIZK+TPTHv29LjeGxeYIV+vSW9G2IEGxbpA j3cSKWWpJ4QVjJnAsTv1v1iMifvx1nYkLpNx4+B4ZDeT58jpYbzdep5XdS773iZ+pO 2CO5Zep8FeXpw== In-Reply-To: <20210913223601.436675-1-sashal-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org> List-ID: Content-Type: text/plain; charset="us-ascii" To: linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, stable-u79uwXL29TY76Z2rM5mHXA@public.gmane.org Cc: Nanyong Sun , Hulk Robot , Ryusuke Konishi , Andrew Morton , Linus Torvalds , Sasha Levin , linux-nilfs-u79uwXL29TY76Z2rM5mHXA@public.gmane.org From: Nanyong Sun [ Upstream commit 5f5dec07aca7067216ed4c1342e464e7307a9197 ] Patch series "nilfs2: fix incorrect usage of kobject". This patchset from Nanyong Sun fixes memory leak issues and a NULL pointer dereference issue caused by incorrect usage of kboject in nilfs2 sysfs implementation. This patch (of 6): Reported by syzkaller: BUG: memory leak unreferenced object 0xffff888100ca8988 (size 8): comm "syz-executor.1", pid 1930, jiffies 4294745569 (age 18.052s) hex dump (first 8 bytes): 6c 6f 6f 70 31 00 ff ff loop1... backtrace: kstrdup+0x36/0x70 mm/util.c:60 kstrdup_const+0x35/0x60 mm/util.c:83 kvasprintf_const+0xf1/0x180 lib/kasprintf.c:48 kobject_set_name_vargs+0x56/0x150 lib/kobject.c:289 kobject_add_varg lib/kobject.c:384 [inline] kobject_init_and_add+0xc9/0x150 lib/kobject.c:473 nilfs_sysfs_create_device_group+0x150/0x7d0 fs/nilfs2/sysfs.c:986 init_nilfs+0xa21/0xea0 fs/nilfs2/the_nilfs.c:637 nilfs_fill_super fs/nilfs2/super.c:1046 [inline] nilfs_mount+0x7b4/0xe80 fs/nilfs2/super.c:1316 legacy_get_tree+0x105/0x210 fs/fs_context.c:592 vfs_get_tree+0x8e/0x2d0 fs/super.c:1498 do_new_mount fs/namespace.c:2905 [inline] path_mount+0xf9b/0x1990 fs/namespace.c:3235 do_mount+0xea/0x100 fs/namespace.c:3248 __do_sys_mount fs/namespace.c:3456 [inline] __se_sys_mount fs/namespace.c:3433 [inline] __x64_sys_mount+0x14b/0x1f0 fs/namespace.c:3433 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3b/0x90 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae If kobject_init_and_add return with error, then the cleanup of kobject is needed because memory may be allocated in kobject_init_and_add without freeing. And the place of cleanup_dev_kobject should use kobject_put to free the memory associated with the kobject. As the section "Kobject removal" of "Documentation/core-api/kobject.rst" says, kobject_del() just makes the kobject "invisible", but it is not cleaned up. And no more cleanup will do after cleanup_dev_kobject, so kobject_put is needed here. Link: https://lkml.kernel.org/r/1625651306-10829-1-git-send-email-konishi.ryusuke-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org Link: https://lkml.kernel.org/r/1625651306-10829-2-git-send-email-konishi.ryusuke-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org Reported-by: Hulk Robot Link: https://lkml.kernel.org/r/20210629022556.3985106-2-sunnanyong-hv44wF8Li93QT0dZR+AlfA@public.gmane.org Signed-off-by: Nanyong Sun Signed-off-by: Ryusuke Konishi Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds Signed-off-by: Sasha Levin --- fs/nilfs2/sysfs.c | 6 ++---- 1 file changed, 2 insertions(+), 4 deletions(-) diff --git a/fs/nilfs2/sysfs.c b/fs/nilfs2/sysfs.c index c3b629eec294..69a8f302170e 100644 --- a/fs/nilfs2/sysfs.c +++ b/fs/nilfs2/sysfs.c @@ -1008,7 +1008,7 @@ int nilfs_sysfs_create_device_group(struct super_block *sb) err = kobject_init_and_add(&nilfs->ns_dev_kobj, &nilfs_dev_ktype, NULL, "%s", sb->s_id); if (err) - goto free_dev_subgroups; + goto cleanup_dev_kobject; err = nilfs_sysfs_create_mounted_snapshots_group(nilfs); if (err) @@ -1045,9 +1045,7 @@ int nilfs_sysfs_create_device_group(struct super_block *sb) nilfs_sysfs_delete_mounted_snapshots_group(nilfs); cleanup_dev_kobject: - kobject_del(&nilfs->ns_dev_kobj); - -free_dev_subgroups: + kobject_put(&nilfs->ns_dev_kobj); kfree(nilfs->ns_dev_subgroups); failed_create_device_group: -- 2.30.2