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Pavel Skripkin 9436cdffaf nilfs2: fix memory leak in nilfs_sysfs_delete_device_group 
[ Upstream commit 8fd0c1b0647a6bda4067ee0cd61e8395954b6f28 ]

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:
     kstrdup+0x36/0x70 mm/util.c:60
     kstrdup_const+0x53/0x80 mm/util.c:83
     kvasprintf_const+0x108/0x190 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+0xc9/0x160 lib/kobject.c:473
     nilfs_sysfs_create_device_group+0x150/0x800 fs/nilfs2/sysfs.c:999
     init_nilfs+0xe26/0x12b0 fs/nilfs2/the_nilfs.c:637

Link: https://lkml.kernel.org/r/20210612140559.20022-1-paskripkin@gmail.com
Fixes: da7141fb78 ("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>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
2021-06-30 08:48:34 -04:00
..
alloc.c nilfs2: convert to SPDX license tags 2018-09-04 16:45:02 -07:00
alloc.h nilfs2: convert to SPDX license tags 2018-09-04 16:45:02 -07:00
bmap.c nilfs2: convert to SPDX license tags 2018-09-04 16:45:02 -07:00
bmap.h nilfs2: convert to SPDX license tags 2018-09-04 16:45:02 -07:00
btnode.c nilfs2: convert to SPDX license tags 2018-09-04 16:45:02 -07:00
btnode.h nilfs2: convert to SPDX license tags 2018-09-04 16:45:02 -07:00
btree.c nilfs2: convert to SPDX license tags 2018-09-04 16:45:02 -07:00
btree.h nilfs2: convert to SPDX license tags 2018-09-04 16:45:02 -07:00
cpfile.c nilfs2: convert to SPDX license tags 2018-09-04 16:45:02 -07:00
cpfile.h nilfs2: convert to SPDX license tags 2018-09-04 16:45:02 -07:00
dat.c nilfs2: convert to SPDX license tags 2018-09-04 16:45:02 -07:00
dat.h nilfs2: convert to SPDX license tags 2018-09-04 16:45:02 -07:00
dir.c nilfs2: convert to SPDX license tags 2018-09-04 16:45:02 -07:00
direct.c nilfs2: convert to SPDX license tags 2018-09-04 16:45:02 -07:00
direct.h nilfs2: convert to SPDX license tags 2018-09-04 16:45:02 -07:00
export.h
file.c nilfs2: convert to SPDX license tags 2018-09-04 16:45:02 -07:00
gcinode.c nilfs2: convert to SPDX license tags 2018-09-04 16:45:02 -07:00
ifile.c nilfs2: convert to SPDX license tags 2018-09-04 16:45:02 -07:00
ifile.h nilfs2: convert to SPDX license tags 2018-09-04 16:45:02 -07:00
inode.c nilfs2: convert to SPDX license tags 2018-09-04 16:45:02 -07:00
ioctl.c nilfs2: convert to SPDX license tags 2018-09-04 16:45:02 -07:00
Kconfig
Makefile
mdt.c nilfs2: convert to SPDX license tags 2018-09-04 16:45:02 -07:00
mdt.h nilfs2: convert to SPDX license tags 2018-09-04 16:45:02 -07:00
namei.c nilfs2: convert to SPDX license tags 2018-09-04 16:45:02 -07:00
nilfs.h nilfs2: convert to SPDX license tags 2018-09-04 16:45:02 -07:00
page.c nilfs2: convert to SPDX license tags 2018-09-04 16:45:02 -07:00
page.h nilfs2: convert to SPDX license tags 2018-09-04 16:45:02 -07:00
recovery.c nilfs2: convert to SPDX license tags 2018-09-04 16:45:02 -07:00
segbuf.c nilfs2: convert to SPDX license tags 2018-09-04 16:45:02 -07:00
segbuf.h nilfs2: convert to SPDX license tags 2018-09-04 16:45:02 -07:00
segment.c nilfs2: fix null pointer dereference at nilfs_segctor_do_construct() 2020-06-22 09:05:03 +02:00
segment.h nilfs2: convert to SPDX license tags 2018-09-04 16:45:02 -07:00
sufile.c nilfs2: convert to SPDX license tags 2018-09-04 16:45:02 -07:00
sufile.h nilfs2: convert to SPDX license tags 2018-09-04 16:45:02 -07:00
super.c nilfs2: convert to SPDX license tags 2018-09-04 16:45:02 -07:00
sysfs.c nilfs2: fix memory leak in nilfs_sysfs_delete_device_group 2021-06-30 08:48:34 -04:00
sysfs.h nilfs2: convert to SPDX license tags 2018-09-04 16:45:02 -07:00
the_nilfs.c nilfs2: convert to SPDX license tags 2018-09-04 16:45:02 -07:00
the_nilfs.h nilfs2: convert to SPDX license tags 2018-09-04 16:45:02 -07:00