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
Fix commit: 8fd0c1b0647a nilfs2: fix memory leak in nilfs_sysfs_delete_device_group
Patched on: [ci-qemu-upstream ci-qemu-upstream-386 ci-qemu2-arm64 ci-qemu2-arm64-compat ci-qemu2-arm64-mte ci-qemu2-riscv64 ci-upstream-bpf-kasan-gce ci-upstream-bpf-next-kasan-gce ci-upstream-gce-leak ci-upstream-kasan-gce ci-upstream-kasan-gce-386 ci-upstream-kasan-gce-root ci-upstream-kasan-gce-selinux-root ci-upstream-kasan-gce-smack-root ci-upstream-kmsan-gce ci-upstream-kmsan-gce-386 ci-upstream-linux-next-kasan-gce-root ci-upstream-net-kasan-gce ci-upstream-net-this-kasan-gce ci2-upstream-kcsan-gce ci2-upstream-usb], missing on: [ci-qemu2-arm32]
First crash: 253d, last: 36d

similar bugs (3):
Kernel	Title	Repro	Cause bisect	Count	Last	Reported	Patched	Status
upstream	memory leak in kobject_set_name_vargs	C		12	757d	790d	13/22	fixed on 2019/07/10 21:40
upstream	memory leak in kobject_set_name_vargs (3)	C		19	254d	310d	17/22	fixed on 2020/11/16 12:12
upstream	memory leak in kobject_set_name_vargs (2)	C	done	47	551d	735d	16/22	fixed on 2020/02/18 14:31

Sample crash report:

BUG: memory leak
unreferenced object 0xffff888113569100 (size 32):
  comm "syz-executor213", pid 8412, jiffies 4294942411 (age 22.940s)
  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:
    [<ffffffff81472fa6>] kstrdup+0x36/0x70 mm/util.c:60
    [<ffffffff81473033>] kstrdup_const+0x53/0x80 mm/util.c:83
    [<ffffffff8225d122>] kvasprintf_const+0xc2/0x110 lib/kasprintf.c:48
    [<ffffffff8232474b>] kobject_set_name_vargs+0x3b/0xe0 lib/kobject.c:289
    [<ffffffff82324bdd>] kobject_add_varg lib/kobject.c:384 [inline]
    [<ffffffff82324bdd>] kobject_init_and_add+0x6d/0xc0 lib/kobject.c:473
    [<ffffffff81d23298>] nilfs_sysfs_create_device_group+0x98/0x3a0 fs/nilfs2/sysfs.c:999
    [<ffffffff81d0bfd0>] init_nilfs+0x520/0x680 fs/nilfs2/the_nilfs.c:637
    [<ffffffff81cf973b>] nilfs_fill_super fs/nilfs2/super.c:1046 [inline]
    [<ffffffff81cf973b>] nilfs_mount+0x51b/0x890 fs/nilfs2/super.c:1316
    [<ffffffff815c128b>] legacy_get_tree+0x2b/0x90 fs/fs_context.c:592
    [<ffffffff8155e468>] vfs_get_tree+0x28/0x100 fs/super.c:1498
    [<ffffffff8159ebee>] do_new_mount fs/namespace.c:2905 [inline]
    [<ffffffff8159ebee>] path_mount+0xc3e/0x1110 fs/namespace.c:3235
    [<ffffffff8159f80e>] do_mount fs/namespace.c:3248 [inline]
    [<ffffffff8159f80e>] __do_sys_mount fs/namespace.c:3456 [inline]
    [<ffffffff8159f80e>] __se_sys_mount fs/namespace.c:3433 [inline]
    [<ffffffff8159f80e>] __x64_sys_mount+0x18e/0x1d0 fs/namespace.c:3433
    [<ffffffff843540da>] do_syscall_64+0x3a/0xb0 arch/x86/entry/common.c:47
    [<ffffffff84400068>] entry_SYSCALL_64_after_hwframe+0x44/0xae

Crashes (169):
Manager	Time	Kernel	Commit	Syzkaller	Config	Log	Report	Syz repro	C repro	Title
ci-upstream-gce-leak	2021/06/08 12:15	upstream	614124bea77e	b718257f	.config	log	report	syz	C	memory leak in kobject_set_name_vargs
ci-upstream-gce-leak	2021/05/31 02:34	upstream	b90e90f40b4f	325a8dab	.config	log	report	syz	C	memory leak in kobject_set_name_vargs
ci-upstream-gce-leak	2021/05/22 09:46	upstream	45af60e7ced0	3c7fef33	.config	log	report	syz	C	memory leak in kobject_set_name_vargs
ci-upstream-gce-leak	2021/05/20 05:49	upstream	c3d0e3fd41b7	a343ba6b	.config	log	report	syz	C	memory leak in kobject_set_name_vargs
ci-upstream-gce-leak	2021/05/17 19:50	upstream	d07f6ca923ea	a2eb125d	.config	log	report	syz	C	memory leak in kobject_set_name_vargs
ci-upstream-gce-leak	2021/05/16 17:02	upstream	63d1cb53e26a	f54a5c09	.config	log	report	syz	C	memory leak in kobject_set_name_vargs
ci-upstream-gce-leak	2021/05/15 18:33	upstream	25a1298726e9	93f844de	.config	log	report	syz	C	memory leak in kobject_set_name_vargs
ci-upstream-gce-leak	2021/05/09 14:51	upstream	b741596468b0	bc5434be	.config	log	report	syz	C	memory leak in kobject_set_name_vargs
ci-upstream-gce-leak	2021/05/07 11:57	upstream	e48661230cc3	f6da8120	.config	log	report	syz	C	memory leak in kobject_set_name_vargs
ci-upstream-gce-leak	2021/05/06 21:03	upstream	322a3b843d7f	06585184	.config	log	report	syz	C	memory leak in kobject_set_name_vargs
ci-upstream-gce-leak	2021/05/06 20:19	upstream	322a3b843d7f	06585184	.config	log	report	syz	C	memory leak in kobject_set_name_vargs
ci-upstream-gce-leak	2021/05/05 15:45	upstream	d665ea6ea86c	06c27ff5	.config	log	report	syz	C	memory leak in kobject_set_name_vargs
ci-upstream-gce-leak	2021/05/05 14:24	upstream	d665ea6ea86c	06c27ff5	.config	log	report	syz	C	memory leak in kobject_set_name_vargs
ci-upstream-gce-leak	2021/05/03 16:51	upstream	9ccce092fc64	ad61f371	.config	log	report	syz	C	memory leak in kobject_set_name_vargs
ci-upstream-gce-leak	2021/05/02 20:16	upstream	17ae69aba89d	77e2b668	.config	log	report	syz	C	memory leak in kobject_set_name_vargs
ci-upstream-gce-leak	2021/05/02 05:57	upstream	e6f0bf09f066	77e2b668	.config	log	report	syz	C	memory leak in kobject_set_name_vargs
ci-upstream-gce-leak	2021/05/01 00:42	upstream	65ec0a7d2491	77e2b668	.config	log	report	syz	C	memory leak in kobject_set_name_vargs
ci-upstream-gce-leak	2021/04/12 21:09	upstream	d434405aaab7	bfeda1b1	.config	log	report	syz	C	memory leak in kobject_set_name_vargs
ci-upstream-gce-leak	2021/01/16 18:40	upstream	1d94330a437a	65a7a854	.config	log	report	syz	C
ci-upstream-gce-leak	2020/11/19 13:21	upstream	c2e7554e1b85	0767f13f	.config	log	report	syz	C
ci-upstream-gce-leak	2020/11/16 16:07	upstream	09162bc32c88	1bf9a662	.config	log	report	syz	C
ci-upstream-gce-leak	2021/06/21 23:28	upstream	13311e74253f	aba2b2fb	.config	log	report	syz		memory leak in kobject_set_name_vargs
ci-upstream-gce-leak	2021/06/20 07:13	upstream	9ed13a17e38e	aba2b2fb	.config	log	report	syz		memory leak in kobject_set_name_vargs
ci-upstream-gce-leak	2021/06/20 03:45	upstream	9ed13a17e38e	aba2b2fb	.config	log	report	syz		memory leak in kobject_set_name_vargs
ci-upstream-gce-leak	2021/06/18 12:43	upstream	fd0aa1a4567d	aba2b2fb	.config	log	report	syz		memory leak in kobject_set_name_vargs
ci-upstream-gce-leak	2021/06/17 20:54	upstream	70585216fe77	aba2b2fb	.config	log	report	syz		memory leak in kobject_set_name_vargs
ci-upstream-gce-leak	2021/06/16 17:31	upstream	94f0b2d4a1d0	c06f97ad	.config	log	report	syz		memory leak in kobject_set_name_vargs
ci-upstream-gce-leak	2021/06/14 02:53	upstream	e4e453434a19	1ba81399	.config	log	report	syz		memory leak in kobject_set_name_vargs
ci-upstream-gce-leak	2021/06/13 16:12	upstream	8ecfa36cd4db	1ba81399	.config	log	report	syz		memory leak in kobject_set_name_vargs
ci-upstream-gce-leak	2021/06/12 03:25	upstream	f21b807c3cf8	1ba81399	.config	log	report	syz		memory leak in kobject_set_name_vargs
ci-upstream-gce-leak	2021/06/11 05:41	upstream	f09eacca59d2	1ba81399	.config	log	report	syz		memory leak in kobject_set_name_vargs
ci-upstream-gce-leak	2021/06/08 03:43	upstream	614124bea77e	e59537be	.config	log	report	syz		memory leak in kobject_set_name_vargs
ci-upstream-gce-leak	2021/06/06 11:23	upstream	f5b6eb1e0182	500c2339	.config	log	report	syz		memory leak in kobject_set_name_vargs
ci-upstream-gce-leak	2021/06/06 08:15	upstream	9d32fa5d74b1	500c2339	.config	log	report	syz		memory leak in kobject_set_name_vargs
ci-upstream-gce-leak	2021/06/05 13:28	upstream	16f0596fc1d7	500c2339	.config	log	report	syz		memory leak in kobject_set_name_vargs
ci-upstream-gce-leak	2021/06/01 09:17	upstream	c2131f7e73c9	032639db	.config	log	report	syz		memory leak in kobject_set_name_vargs
ci-upstream-gce-leak	2021/05/31 00:02	upstream	b90e90f40b4f	325a8dab	.config	log	report	syz		memory leak in kobject_set_name_vargs
ci-upstream-gce-leak	2021/05/29 09:02	upstream	5ff2756afde0	858ea628	.config	log	report	syz		memory leak in kobject_set_name_vargs
ci-upstream-gce-leak	2021/05/26 17:27	upstream	ad9f25d33860	54f0bcf1	.config	log	report	syz		memory leak in kobject_set_name_vargs
ci-upstream-gce-leak	2021/05/25 18:27	upstream	a050a6d2b7e8	93d3a9f6	.config	log	report	syz		memory leak in kobject_set_name_vargs
ci-upstream-gce-leak	2021/05/23 20:54	upstream	4d7620341eda	3c7fef33	.config	log	report	syz		memory leak in kobject_set_name_vargs
ci-upstream-gce-leak	2021/05/22 16:41	upstream	45af60e7ced0	3c7fef33	.config	log	report	syz		memory leak in kobject_set_name_vargs
ci-upstream-gce-leak	2021/05/20 23:48	upstream	f01da525b3de	c560a65d	.config	log	report	syz		memory leak in kobject_set_name_vargs
ci-upstream-gce-leak	2021/05/20 22:49	upstream	f01da525b3de	c560a65d	.config	log	report	syz		memory leak in kobject_set_name_vargs
ci-upstream-gce-leak	2021/05/19 05:46	upstream	8ac91e6c6033	a343ba6b	.config	log	report	syz		memory leak in kobject_set_name_vargs
ci-upstream-gce-leak	2021/05/15 06:54	upstream	bd3c9cdb21a2	8bdd5343	.config	log	report	syz		memory leak in kobject_set_name_vargs
ci-upstream-gce-leak	2021/05/08 17:14	upstream	dd860052c99b	bc5434be	.config	log	report	syz		memory leak in kobject_set_name_vargs
ci-upstream-gce-leak	2021/05/05 19:18	upstream	d665ea6ea86c	06c27ff5	.config	log	report	syz		memory leak in kobject_set_name_vargs
ci-upstream-gce-leak	2021/05/01 04:50	upstream	65ec0a7d2491	77e2b668	.config	log	report	syz		memory leak in kobject_set_name_vargs
ci-upstream-gce-leak	2021/04/28 12:37	upstream	57fa2369ab17	805b5003	.config	log	report	syz		memory leak in kobject_set_name_vargs
ci-upstream-gce-leak	2021/04/25 17:41	upstream	2a1d7946fa53	36c88236	.config	log	report	syz		memory leak in kobject_set_name_vargs
ci-upstream-gce-leak	2021/04/18 07:57	upstream	194cf4825638	7e2b734b	.config	log	report	syz		memory leak in kobject_set_name_vargs
ci-upstream-gce-leak	2021/04/12 09:28	upstream	7d900724913c	bfeda1b1	.config	log	report	syz		memory leak in kobject_set_name_vargs