memory leak in kobject_set_name

memory leak in kobject_set_name_vargs (4)
Status: upstream: reported C repro on 2020/11/20 16:15
Reported-by: syzbot+859119106243eb95085b@syzkaller.appspotmail.com
First crash: 155d, last: 3d00h

similar bugs (3):
Kernel	Title	Repro	Cause bisect	Count	Last	Reported	Patched	Status
upstream	memory leak in kobject_set_name_vargs	C		12	659d	692d	13/22	fixed on 2019/07/10 21:40
upstream	memory leak in kobject_set_name_vargs (3)	C		19	156d	211d	17/22	fixed on 2020/11/16 12:12
upstream	memory leak in kobject_set_name_vargs (2)	C	done	47	452d	637d	16/22	fixed on 2020/02/18 14:31

Sample crash report:

BUG: memory leak
unreferenced object 0xffff8881109914e0 (size 32):
  comm "syz-executor945", pid 8386, jiffies 4294942996 (age 12.480s)
  hex dump (first 32 bytes):
    6c 6f 6f 70 30 00 00 00 00 00 00 00 00 00 00 00  loop0...........
    00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
  backtrace:
    [<ffffffff81464f96>] kstrdup+0x36/0x70 mm/util.c:60
    [<ffffffff81465023>] kstrdup_const+0x53/0x80 mm/util.c:83
    [<ffffffff82234382>] kvasprintf_const+0xc2/0x110 lib/kasprintf.c:48
    [<ffffffff822f414b>] kobject_set_name_vargs+0x3b/0xe0 lib/kobject.c:289
    [<ffffffff822f45dd>] kobject_add_varg lib/kobject.c:384 [inline]
    [<ffffffff822f45dd>] kobject_init_and_add+0x6d/0xc0 lib/kobject.c:473
    [<ffffffff81d03c78>] nilfs_sysfs_create_device_group+0x98/0x3a0 fs/nilfs2/sysfs.c:999
    [<ffffffff81cec9e0>] init_nilfs+0x520/0x680 fs/nilfs2/the_nilfs.c:637
    [<ffffffff81cda11b>] nilfs_fill_super fs/nilfs2/super.c:1046 [inline]
    [<ffffffff81cda11b>] nilfs_mount+0x51b/0x890 fs/nilfs2/super.c:1316
    [<ffffffff815af28b>] legacy_get_tree+0x2b/0x90 fs/fs_context.c:592
    [<ffffffff8154cbf8>] vfs_get_tree+0x28/0x100 fs/super.c:1497
    [<ffffffff8158ccfe>] do_new_mount fs/namespace.c:2903 [inline]
    [<ffffffff8158ccfe>] path_mount+0xc3e/0x1120 fs/namespace.c:3233
    [<ffffffff8158d92e>] do_mount fs/namespace.c:3246 [inline]
    [<ffffffff8158d92e>] __do_sys_mount fs/namespace.c:3454 [inline]
    [<ffffffff8158d92e>] __se_sys_mount fs/namespace.c:3431 [inline]
    [<ffffffff8158d92e>] __x64_sys_mount+0x18e/0x1d0 fs/namespace.c:3431
    [<ffffffff842e0f6d>] do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
    [<ffffffff84400068>] entry_SYSCALL_64_after_hwframe+0x44/0xae

Crashes (122):
Manager	Time	Kernel	Commit	Syzkaller	Config	Log	Report	Syz repro	C repro	Title
ci-upstream-gce-leak	2021/04/12 21:09	upstream	d434405a	bfeda1b1	.config	log	report	syz	C	memory leak in kobject_set_name_vargs
ci-upstream-gce-leak	2021/04/12 01:50	upstream	7d900724	bfeda1b1	.config	log	report	syz	C	memory leak in kobject_set_name_vargs
ci-upstream-gce-leak	2021/04/01 18:03	upstream	d19cc4bf	6a81331a	.config	log	report	syz	C	memory leak in kobject_set_name_vargs
ci-upstream-gce-leak	2021/03/31 09:45	upstream	2bb25b3a	6a81331a	.config	log	report	syz	C	memory leak in kobject_set_name_vargs
ci-upstream-gce-leak	2021/02/21 21:32	upstream	55f62bc8	a659b3f1	.config	log	report	syz	C	memory leak in kobject_set_name_vargs
ci-upstream-gce-leak	2021/02/19 20:09	upstream	f40ddce8	f689d40a	.config	log	report	syz	C	memory leak in kobject_set_name_vargs
ci-upstream-gce-leak	2021/02/18 06:56	upstream	f40ddce8	14052202	.config	log	report	syz	C	memory leak in kobject_set_name_vargs
ci-upstream-gce-leak	2021/02/17 22:06	upstream	f40ddce8	14052202	.config	log	report	syz	C	memory leak in kobject_set_name_vargs
ci-upstream-gce-leak	2021/02/17 16:36	upstream	f40ddce8	052f8d9f	.config	log	report	syz	C	memory leak in kobject_set_name_vargs
ci-upstream-gce-leak	2021/02/15 21:58	upstream	f40ddce8	98682e5e	.config	log	report	syz	C	memory leak in kobject_set_name_vargs
ci-upstream-gce-leak	2021/02/15 14:44	upstream	f40ddce8	98682e5e	.config	log	report	syz	C	memory leak in kobject_set_name_vargs
ci-upstream-gce-leak	2021/02/15 13:59	upstream	f40ddce8	98682e5e	.config	log	report	syz	C	memory leak in kobject_set_name_vargs
ci-upstream-gce-leak	2021/02/14 19:30	upstream	358fecee	98682e5e	.config	log	report	syz	C	memory leak in kobject_set_name_vargs
ci-upstream-gce-leak	2021/02/14 03:57	upstream	ac30d8ce	98682e5e	.config	log	report	syz	C	memory leak in kobject_set_name_vargs
ci-upstream-gce-leak	2021/02/13 03:12	upstream	dcc0b490	98682e5e	.config	log	report	syz	C	memory leak in kobject_set_name_vargs
ci-upstream-gce-leak	2021/02/10 14:41	upstream	e0756cfc	2bd9619f	.config	log	report	syz	C	memory leak in kobject_set_name_vargs
ci-upstream-gce-leak	2021/02/08 19:31	upstream	92bf2261	2ce644fc	.config	log	report	syz	C	memory leak in kobject_set_name_vargs
ci-upstream-gce-leak	2021/02/07 13:34	upstream	825b5991	2ce644fc	.config	log	report	syz	C	memory leak in kobject_set_name_vargs
ci-upstream-gce-leak	2021/02/05 18:09	upstream	dd86e7fa	23a562df	.config	log	report	syz	C	memory leak in kobject_set_name_vargs
ci-upstream-gce-leak	2021/02/05 16:51	upstream	dd86e7fa	23a562df	.config	log	report	syz	C	memory leak in kobject_set_name_vargs
ci-upstream-gce-leak	2021/02/04 15:51	upstream	61556703	42b90a7c	.config	log	report	syz	C	memory leak in kobject_set_name_vargs
ci-upstream-gce-leak	2021/02/04 06:38	upstream	3afe9076	624dad51	.config	log	report	syz	C	memory leak in kobject_set_name_vargs
ci-upstream-gce-leak	2021/02/03 08:48	upstream	3aaf0a27	624dad51	.config	log	report	syz	C	memory leak in kobject_set_name_vargs
ci-upstream-gce-leak	2021/02/01 22:29	upstream	1048ba83	e6b95f32	.config	log	report	syz	C	memory leak in kobject_set_name_vargs
ci-upstream-gce-leak	2021/02/01 09:33	upstream	1048ba83	fc9fd31e	.config	log	report	syz	C	memory leak in kobject_set_name_vargs
ci-upstream-gce-leak	2021/01/31 16:58	upstream	6642d600	fc9fd31e	.config	log	report	syz	C	memory leak in kobject_set_name_vargs
ci-upstream-gce-leak	2021/01/31 01:56	upstream	8c947645	fc9fd31e	.config	log	report	syz	C	memory leak in kobject_set_name_vargs
ci-upstream-gce-leak	2021/01/30 10:21	upstream	0e9bcda5	fc9fd31e	.config	log	report	syz	C	memory leak in kobject_set_name_vargs
ci-upstream-gce-leak	2021/01/29 15:40	upstream	bec4c296	6593fd32	.config	log	report	syz	C	memory leak in kobject_set_name_vargs
ci-upstream-gce-leak	2021/01/28 22:26	upstream	e5ff2cb9	7df34f59	.config	log	report	syz	C	memory leak in kobject_set_name_vargs
ci-upstream-gce-leak	2021/01/27 17:32	upstream	2ab38c17	a0ebf917	.config	log	report	syz	C	memory leak in kobject_set_name_vargs
ci-upstream-gce-leak	2021/01/26 19:24	upstream	13391c60	55a7d4df	.config	log	report	syz	C	memory leak in kobject_set_name_vargs
ci-upstream-gce-leak	2021/01/26 07:27	upstream	f8ad8187	52e37319	.config	log	report	syz	C	memory leak in kobject_set_name_vargs
ci-upstream-gce-leak	2021/01/24 10:26	upstream	e1ae4b0b	52e37319	.config	log	report	syz	C	memory leak in kobject_set_name_vargs
ci-upstream-gce-leak	2021/01/22 13:15	upstream	9f29bd8b	d4f4eca5	.config	log	report	syz	C	memory leak in kobject_set_name_vargs
ci-upstream-gce-leak	2021/01/16 18:40	upstream	1d94330a	65a7a854	.config	log	report	syz	C
ci-upstream-gce-leak	2020/11/19 13:21	upstream	c2e7554e	0767f13f	.config	log	report	syz	C
ci-upstream-gce-leak	2020/11/16 16:07	upstream	09162bc3	1bf9a662	.config	log	report	syz	C
ci-upstream-gce-leak	2021/04/18 07:57	upstream	194cf482	7e2b734b	.config	log	report	syz		memory leak in kobject_set_name_vargs
ci-upstream-gce-leak	2021/04/12 09:28	upstream	7d900724	bfeda1b1	.config	log	report	syz		memory leak in kobject_set_name_vargs
ci-upstream-gce-leak	2021/04/08 16:07	upstream	454859c5	6a81331a	.config	log	report	syz		memory leak in kobject_set_name_vargs
ci-upstream-gce-leak	2021/04/03 07:10	upstream	d93a0d43	6a81331a	.config	log	report	syz		memory leak in kobject_set_name_vargs
ci-upstream-gce-leak	2021/04/01 01:16	upstream	5e46d1b7	6a81331a	.config	log	report	syz		memory leak in kobject_set_name_vargs
ci-upstream-gce-leak	2021/03/17 07:32	upstream	1df27313	fdb2bb2c	.config	log	report	syz		memory leak in kobject_set_name_vargs
ci-upstream-gce-leak	2021/03/15 01:40	upstream	75013c6c	cc1cff8f	.config	log	report	syz		memory leak in kobject_set_name_vargs
ci-upstream-gce-leak	2021/03/14 15:16	upstream	88fe4924	4a003785	.config	log	report	syz		memory leak in kobject_set_name_vargs