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Date:   Thu, 26 Oct 2017 09:35:44 -0700
From:   syzbot 
        <bot+ea75c0ffcd353d32515f064aaebefc5279e6161e@...kaller.appspotmail.com>
To:     jiangshanlai@...il.com, linux-kernel@...r.kernel.org,
        syzkaller-bugs@...glegroups.com, tj@...nel.org
Subject: KASAN: use-after-free Read in get_work_pool

Hello,

syzkaller hit the following crash on  
ad9a19d003703ae06a6e8efc64cf26a939d9e84d
git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next.git/master
compiler: gcc (GCC) 7.1.1 20170620
.config is attached
Raw console output is attached.

syzkaller reproducer is attached. See https://goo.gl/kgGztJ
for information about syzkaller reproducers


BUG: KASAN: use-after-free in __read_once_size include/linux/compiler.h:276  
[inline]
BUG: KASAN: use-after-free in atomic64_read  
arch/x86/include/asm/atomic64_64.h:21 [inline]
BUG: KASAN: use-after-free in atomic_long_read  
include/asm-generic/atomic-long.h:44 [inline]
BUG: KASAN: use-after-free in get_work_pool+0x1c2/0x1e0  
kernel/workqueue.c:709
Read of size 8 at addr ffff8801cc58c378 by task syz-executor5/21326

CPU: 1 PID: 21326 Comm: syz-executor5 Not tainted 4.13.0+ #43
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS  
Google 01/01/2011
Call Trace:
  __dump_stack lib/dump_stack.c:16 [inline]
  dump_stack+0x194/0x257 lib/dump_stack.c:52
  print_address_description+0x73/0x250 mm/kasan/report.c:252
  kasan_report_error mm/kasan/report.c:351 [inline]
  kasan_report+0x24e/0x340 mm/kasan/report.c:409
  __asan_report_load8_noabort+0x14/0x20 mm/kasan/report.c:430
  __read_once_size include/linux/compiler.h:276 [inline]
  atomic64_read arch/x86/include/asm/atomic64_64.h:21 [inline]
  atomic_long_read include/asm-generic/atomic-long.h:44 [inline]
  get_work_pool+0x1c2/0x1e0 kernel/workqueue.c:709
  __queue_work+0x235/0x1150 kernel/workqueue.c:1401
  queue_work_on+0x16a/0x1c0 kernel/workqueue.c:1486
  queue_work include/linux/workqueue.h:489 [inline]
  strp_check_rcv+0x25/0x30 net/strparser/strparser.c:553
  kcm_attach net/kcm/kcmsock.c:1439 [inline]
  kcm_attach_ioctl net/kcm/kcmsock.c:1460 [inline]
  kcm_ioctl+0x826/0x1610 net/kcm/kcmsock.c:1695
  sock_do_ioctl+0x65/0xb0 net/socket.c:961
  sock_ioctl+0x2c2/0x440 net/socket.c:1058
  vfs_ioctl fs/ioctl.c:45 [inline]
  do_vfs_ioctl+0x1b1/0x1530 fs/ioctl.c:685
  SYSC_ioctl fs/ioctl.c:700 [inline]
  SyS_ioctl+0x8f/0xc0 fs/ioctl.c:691
  entry_SYSCALL_64_fastpath+0x1f/0xbe
RIP: 0033:0x451e59
RSP: 002b:00007f95185c3c08 EFLAGS: 00000216 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 0000000000718160 RCX: 0000000000451e59
RDX: 00000000209b9000 RSI: 00000000000089e0 RDI: 000000000000000a
RBP: 0000000000000082 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000216 R12: 00000000004bb657
R13: 00000000ffffffff R14: 0000000000000002 R15: 0000000000000001

Allocated by task 21326:
  save_stack_trace+0x16/0x20 arch/x86/kernel/stacktrace.c:59
  save_stack+0x43/0xd0 mm/kasan/kasan.c:447
  set_track mm/kasan/kasan.c:459 [inline]
  kasan_kmalloc+0xad/0xe0 mm/kasan/kasan.c:551
  kasan_slab_alloc+0x12/0x20 mm/kasan/kasan.c:489
  kmem_cache_alloc+0x12e/0x760 mm/slab.c:3561
  kmem_cache_zalloc include/linux/slab.h:656 [inline]
  kcm_attach net/kcm/kcmsock.c:1394 [inline]
  kcm_attach_ioctl net/kcm/kcmsock.c:1460 [inline]
  kcm_ioctl+0x2d1/0x1610 net/kcm/kcmsock.c:1695
  sock_do_ioctl+0x65/0xb0 net/socket.c:961
  sock_ioctl+0x2c2/0x440 net/socket.c:1058
  vfs_ioctl fs/ioctl.c:45 [inline]
  do_vfs_ioctl+0x1b1/0x1530 fs/ioctl.c:685
  SYSC_ioctl fs/ioctl.c:700 [inline]
  SyS_ioctl+0x8f/0xc0 fs/ioctl.c:691
  entry_SYSCALL_64_fastpath+0x1f/0xbe

Freed by task 21329:
  save_stack_trace+0x16/0x20 arch/x86/kernel/stacktrace.c:59
  save_stack+0x43/0xd0 mm/kasan/kasan.c:447
  set_track mm/kasan/kasan.c:459 [inline]
  kasan_slab_free+0x71/0xc0 mm/kasan/kasan.c:524
  __cache_free mm/slab.c:3503 [inline]
  kmem_cache_free+0x77/0x280 mm/slab.c:3763
  kcm_unattach+0xe50/0x1510 net/kcm/kcmsock.c:1563
  kcm_unattach_ioctl net/kcm/kcmsock.c:1608 [inline]
  kcm_ioctl+0xdf0/0x1610 net/kcm/kcmsock.c:1705
  sock_do_ioctl+0x65/0xb0 net/socket.c:961
  sock_ioctl+0x2c2/0x440 net/socket.c:1058
  vfs_ioctl fs/ioctl.c:45 [inline]
  do_vfs_ioctl+0x1b1/0x1530 fs/ioctl.c:685
  SYSC_ioctl fs/ioctl.c:700 [inline]
  SyS_ioctl+0x8f/0xc0 fs/ioctl.c:691
  entry_SYSCALL_64_fastpath+0x1f/0xbe

The buggy address belongs to the object at ffff8801cc58c240
  which belongs to the cache kcm_psock_cache of size 664
The buggy address is located 312 bytes inside of
  664-byte region [ffff8801cc58c240, ffff8801cc58c4d8)
The buggy address belongs to the page:
page:ffffea0007316300 count:1 mapcount:0 mapping:ffff8801cc58c240 index:0x0  
compound_mapcount: 0
flags: 0x200000000008100(slab|head)
raw: 0200000000008100 ffff8801cc58c240 0000000000000000 0000000100000009
raw: ffffea000732f520 ffffea0007314ca0 ffff8801d2866e40 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
  ffff8801cc58c200: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb
  ffff8801cc58c280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
> ffff8801cc58c300: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                                                 ^
  ffff8801cc58c380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
  ffff8801cc58c400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================


---
This bug is generated by a dumb bot. It may contain errors.
See https://goo.gl/tpsmEJ for details.
Direct all questions to syzkaller@...glegroups.com.

syzbot will keep track of this bug report.
Once a fix for this bug is committed, please reply to this email with:
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To mark this as a duplicate of another syzbot report, please reply with:
#syz dup: exact-subject-of-another-report
If it's a one-off invalid bug report, please reply with:
#syz invalid
Note: if the crash happens again, it will cause creation of a new bug  
report.

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