memory leak in create_pipe

memory leak in create_pipe_files
Status: upstream: reported C repro on 2020/07/15 08:39
Reported-by: syzbot+6a137efd811917e8b53c@syzkaller.appspotmail.com
First crash: 284d, last: 31d

Patch testing requests:
Created	Duration	User	Patch	Repo	Result
2021/04/10 23:39	16m	phil@philpotter.co.uk		https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master	OK
2020/09/23 17:56	13m	anant.thazhemadam@gmail.com		upstream	report log

Sample crash report:

BUG: memory leak
unreferenced object 0xffff88811141d500 (size 232):
  comm "kworker/u4:5", pid 8402, jiffies 4294943667 (age 12.510s)
  hex dump (first 32 bytes):
    00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
    60 ba 04 01 81 88 ff ff c0 39 54 0f 81 88 ff ff  `........9T.....
  backtrace:
    [<ffffffff8154ad9f>] kmem_cache_zalloc include/linux/slab.h:674 [inline]
    [<ffffffff8154ad9f>] __alloc_file+0x1f/0xf0 fs/file_table.c:101
    [<ffffffff8154b4d9>] alloc_empty_file+0x69/0x120 fs/file_table.c:150
    [<ffffffff8154b5c3>] alloc_file+0x33/0x1b0 fs/file_table.c:192
    [<ffffffff8154b7f2>] alloc_file_pseudo+0xb2/0x140 fs/file_table.c:232
    [<ffffffff81559ee8>] create_pipe_files+0x138/0x2e0 fs/pipe.c:911
    [<ffffffff8126cad3>] umd_setup+0x33/0x220 kernel/usermode_driver.c:104
    [<ffffffff812535d4>] call_usermodehelper_exec_async+0xb4/0x1b0 kernel/umh.c:101
    [<ffffffff8100227f>] ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294

BUG: memory leak
unreferenced object 0xffff8881101321f8 (size 24):
  comm "kworker/u4:5", pid 8402, jiffies 4294943667 (age 12.510s)
  hex dump (first 24 bytes):
    00 00 00 00 00 00 00 00 b0 0e 94 00 81 88 ff ff  ................
    00 00 00 00 00 00 00 00                          ........
  backtrace:
    [<ffffffff820e2ada>] kmem_cache_zalloc include/linux/slab.h:674 [inline]
    [<ffffffff820e2ada>] lsm_file_alloc security/security.c:569 [inline]
    [<ffffffff820e2ada>] security_file_alloc+0x2a/0xb0 security/security.c:1470
    [<ffffffff8154addd>] __alloc_file+0x5d/0xf0 fs/file_table.c:106
    [<ffffffff8154b4d9>] alloc_empty_file+0x69/0x120 fs/file_table.c:150
    [<ffffffff8154b5c3>] alloc_file+0x33/0x1b0 fs/file_table.c:192
    [<ffffffff8154b7f2>] alloc_file_pseudo+0xb2/0x140 fs/file_table.c:232
    [<ffffffff81559ee8>] create_pipe_files+0x138/0x2e0 fs/pipe.c:911
    [<ffffffff8126cad3>] umd_setup+0x33/0x220 kernel/usermode_driver.c:104
    [<ffffffff812535d4>] call_usermodehelper_exec_async+0xb4/0x1b0 kernel/umh.c:101
    [<ffffffff8100227f>] ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294

Crashes (30):
Manager	Time	Kernel	Commit	Syzkaller	Config	Log	Report	Syz repro	C repro	Title
ci-upstream-gce-leak	2021/03/21 13:02	upstream	812da4d3	17810eae	.config	log	report	syz	C	memory leak in create_pipe_files
ci-upstream-gce-leak	2021/03/18 03:10	upstream	6417f031	fdb2bb2c	.config	log	report	syz	C	memory leak in create_pipe_files
ci-upstream-gce-leak	2021/03/16 06:51	upstream	1a4431a5	fdb2bb2c	.config	log	report	syz	C	memory leak in create_pipe_files
ci-upstream-gce-leak	2021/03/13 11:16	upstream	f296bfd5	4a003785	.config	log	report	syz	C	memory leak in create_pipe_files
ci-upstream-gce-leak	2021/03/12 15:14	upstream	f78d76e7	429d8a6b	.config	log	report	syz	C	memory leak in create_pipe_files
ci-upstream-gce-leak	2021/03/02 02:18	upstream	7a7fd0de	183afb6c	.config	log	report	syz	C	memory leak in create_pipe_files
ci-upstream-gce-leak	2021/02/26 12:45	upstream	2c87f7a3	76f7fc95	.config	log	report	syz	C	memory leak in create_pipe_files
ci-upstream-gce-leak	2021/02/20 10:07	upstream	f40ddce8	f689d40a	.config	log	report	syz	C	memory leak in create_pipe_files
ci-upstream-gce-leak	2021/02/20 06:46	upstream	f40ddce8	f689d40a	.config	log	report	syz	C	memory leak in create_pipe_files
ci-upstream-gce-leak	2021/02/15 03:55	upstream	f40ddce8	98682e5e	.config	log	report	syz	C	memory leak in create_pipe_files
ci-upstream-gce-leak	2021/02/13 17:53	upstream	c6d8570e	98682e5e	.config	log	report	syz	C	memory leak in create_pipe_files
ci-upstream-gce-leak	2021/02/13 01:25	upstream	dcc0b490	98682e5e	.config	log	report	syz	C	memory leak in create_pipe_files
ci-upstream-gce-leak	2021/02/12 17:11	upstream	dcc0b490	a5f86b15	.config	log	report	syz	C	memory leak in create_pipe_files
ci-upstream-gce-leak	2021/02/12 03:51	upstream	291009f6	a5f86b15	.config	log	report	syz	C	memory leak in create_pipe_files
ci-upstream-gce-leak	2021/02/10 11:34	upstream	e0756cfc	2bd9619f	.config	log	report	syz	C	memory leak in create_pipe_files
ci-upstream-gce-leak	2021/02/09 10:34	upstream	e0756cfc	2bd9619f	.config	log	report	syz	C	memory leak in create_pipe_files
ci-upstream-gce-leak	2021/02/09 06:44	upstream	e0756cfc	2bd9619f	.config	log	report	syz	C	memory leak in create_pipe_files
ci-upstream-gce-leak	2021/02/08 13:51	upstream	92bf2261	2ce644fc	.config	log	report	syz	C	memory leak in create_pipe_files
ci-upstream-gce-leak	2021/02/08 09:32	upstream	b75dba7f	2ce644fc	.config	log	report	syz	C	memory leak in create_pipe_files
ci-upstream-gce-leak	2021/02/08 07:52	upstream	b75dba7f	2ce644fc	.config	log	report	syz	C	memory leak in create_pipe_files
ci-upstream-gce-leak	2021/02/07 03:08	upstream	964d069f	0655e081	.config	log	report	syz	C	memory leak in create_pipe_files
ci-upstream-gce-leak	2021/02/06 18:49	upstream	1e0d27fc	0655e081	.config	log	report	syz	C	memory leak in create_pipe_files
ci-upstream-gce-leak	2021/02/06 06:56	upstream	1e0d27fc	23a562df	.config	log	report	syz	C	memory leak in create_pipe_files
ci-upstream-gce-leak	2021/02/04 16:16	upstream	61556703	42b90a7c	.config	log	report	syz	C	memory leak in create_pipe_files
ci-upstream-gce-leak	2021/02/03 14:54	upstream	3aaf0a27	624dad51	.config	log	report	syz	C	memory leak in create_pipe_files
ci-upstream-gce-leak	2021/02/03 08:10	upstream	3aaf0a27	624dad51	.config	log	report	syz	C	memory leak in create_pipe_files
ci-upstream-gce-leak	2021/02/03 03:58	upstream	3aaf0a27	624dad51	.config	log	report	syz	C	memory leak in create_pipe_files
ci-upstream-gce-leak	2021/03/03 16:06	upstream	f69d02e3	e5b64d68	.config	log	report	syz		memory leak in create_pipe_files
ci-upstream-gce-leak	2021/02/21 15:56	upstream	e767b353	3e5ed8b4	.config	log	report	syz		memory leak in create_pipe_files
ci-upstream-gce-leak	2020/07/11 08:37	upstream	a581387e	18d18b59	.config	log	report	syz