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From: Andrew Morton <akpm@linux-foundation.org>
To: akpm@linux-foundation.org, konishi.ryusuke@gmail.com,
	linux-mm@kvack.org, mlsemon35@gmail.com,
	mm-commits@vger.kernel.org, paskripkin@gmail.com,
	torvalds@linux-foundation.org
Subject: [patch 11/24] nilfs2: fix memory leak in nilfs_sysfs_delete_device_group
Date: Thu, 24 Jun 2021 18:39:33 -0700	[thread overview]
Message-ID: <20210625013933.6EAm6MayP%akpm@linux-foundation.org> (raw)
In-Reply-To: <20210624183838.ac3161ca4a43989665ac8b2f@linux-foundation.org>

From: Pavel Skripkin <paskripkin@gmail.com>
Subject: nilfs2: fix memory leak in nilfs_sysfs_delete_device_group

My local syzbot instance hit memory leak in nilfs2.  The problem was in
missing kobject_put() in nilfs_sysfs_delete_device_group().

kobject_del() does not call kobject_cleanup() for passed kobject and it
leads to leaking duped kobject name if kobject_put() was not called.

Fail log:

BUG: memory leak
unreferenced object 0xffff8880596171e0 (size 8):
  comm "syz-executor379", pid 8381, jiffies 4294980258 (age 21.100s)
  hex dump (first 8 bytes):
    6c 6f 6f 70 30 00 00 00                          loop0...
  backtrace:
    [<ffffffff81a2c656>] kstrdup+0x36/0x70 mm/util.c:60
    [<ffffffff81a2c6e3>] kstrdup_const+0x53/0x80 mm/util.c:83
    [<ffffffff83ccc698>] kvasprintf_const+0x108/0x190 lib/kasprintf.c:48
    [<ffffffff83e99926>] kobject_set_name_vargs+0x56/0x150 lib/kobject.c:289
    [<ffffffff83e99fd9>] kobject_add_varg lib/kobject.c:384 [inline]
    [<ffffffff83e99fd9>] kobject_init_and_add+0xc9/0x160 lib/kobject.c:473
    [<ffffffff8304e840>] nilfs_sysfs_create_device_group+0x150/0x800 fs/nilfs2/sysfs.c:999
    [<ffffffff830159f6>] init_nilfs+0xe26/0x12b0 fs/nilfs2/the_nilfs.c:637

Link: https://lkml.kernel.org/r/20210612140559.20022-1-paskripkin@gmail.com
Fixes: da7141fb78db ("nilfs2: add /sys/fs/nilfs2/<device> group")
Signed-off-by: Pavel Skripkin <paskripkin@gmail.com>
Acked-by: Ryusuke Konishi <konishi.ryusuke@gmail.com>
Cc: Michael L. Semon <mlsemon35@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 fs/nilfs2/sysfs.c |    1 +
 1 file changed, 1 insertion(+)

--- a/fs/nilfs2/sysfs.c~nilfs2-fix-memory-leak-in-nilfs_sysfs_delete_device_group
+++ a/fs/nilfs2/sysfs.c
@@ -1053,6 +1053,7 @@ void nilfs_sysfs_delete_device_group(str
 	nilfs_sysfs_delete_superblock_group(nilfs);
 	nilfs_sysfs_delete_segctor_group(nilfs);
 	kobject_del(&nilfs->ns_dev_kobj);
+	kobject_put(&nilfs->ns_dev_kobj);
 	kfree(nilfs->ns_dev_subgroups);
 }
 
_

  parent reply	other threads:[~2021-06-25  1:39 UTC|newest]

Thread overview: 25+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-06-25  1:38 incoming Andrew Morton
2021-06-25  1:39 ` [patch 01/24] mm: page_vma_mapped_walk(): use page for pvmw->page Andrew Morton
2021-06-25  1:39 ` [patch 02/24] mm: page_vma_mapped_walk(): settle PageHuge on entry Andrew Morton
2021-06-25  1:39 ` [patch 03/24] mm: page_vma_mapped_walk(): use pmde for *pvmw->pmd Andrew Morton
2021-06-25  1:39 ` [patch 04/24] mm: page_vma_mapped_walk(): prettify PVMW_MIGRATION block Andrew Morton
2021-06-25  1:39 ` [patch 05/24] mm: page_vma_mapped_walk(): crossing page table boundary Andrew Morton
2021-06-25  1:39 ` [patch 06/24] mm: page_vma_mapped_walk(): add a level of indentation Andrew Morton
2021-06-25  1:39 ` [patch 07/24] mm: page_vma_mapped_walk(): use goto instead of while (1) Andrew Morton
2021-06-25  1:39 ` [patch 08/24] mm: page_vma_mapped_walk(): get vma_address_end() earlier Andrew Morton
2021-06-25  1:39 ` [patch 09/24] mm/thp: fix page_vma_mapped_walk() if THP mapped by ptes Andrew Morton
2021-06-25  1:39 ` [patch 10/24] mm/thp: another PVMW_SYNC fix in page_vma_mapped_walk() Andrew Morton
2021-06-25  1:39 ` Andrew Morton [this message]
2021-06-25  1:39 ` [patch 12/24] mm/vmalloc: add vmalloc_no_huge Andrew Morton
2021-06-25  1:39 ` [patch 13/24] KVM: s390: prepare for hugepage vmalloc Andrew Morton
2021-06-25  1:39 ` [patch 14/24] mm/vmalloc: unbreak kasan vmalloc support Andrew Morton
2021-06-25  1:39 ` [patch 15/24] kthread_worker: split code for canceling the delayed work timer Andrew Morton
2021-06-25  1:39 ` [patch 16/24] kthread: prevent deadlock when kthread_mod_delayed_work() races with kthread_cancel_delayed_work_sync() Andrew Morton
2021-06-25  1:39 ` [patch 17/24] mm, futex: fix shared futex pgoff on shmem huge page Andrew Morton
2021-06-25  1:39 ` [patch 18/24] mm/memory-failure: use a mutex to avoid memory_failure() races Andrew Morton
2021-06-25  1:39 ` [patch 19/24] mm,hwpoison: return -EHWPOISON to denote that the page has already been poisoned Andrew Morton
2021-06-25  1:40 ` [patch 20/24] mm/hwpoison: do not lock page again when me_huge_page() successfully recovers Andrew Morton
2021-06-25  1:40 ` [patch 21/24] mm/page_alloc: __alloc_pages_bulk(): do bounds check before accessing array Andrew Morton
2021-06-25  1:40 ` [patch 22/24] mm/page_alloc: do bulk array bounds check after checking populated elements Andrew Morton
2021-06-25  1:40 ` [patch 23/24] MAINTAINERS: fix Marek's identity again Andrew Morton
2021-06-25  1:40 ` [patch 24/24] mailmap: add Marek's other e-mail address and identity without diacritics Andrew Morton

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