Message-ID: <000000000000c2e17f0580b3387c@google.com>
Date:   Wed, 30 Jan 2019 13:02:03 -0800
From:   syzbot <syzbot+fb065bc06d3d4054be6f@...kaller.appspotmail.com>
To:     isdn@...ux-pingi.de, linux-kernel@...r.kernel.org,
        netdev@...r.kernel.org, syzkaller-bugs@...glegroups.com
Subject: KASAN: use-after-free Read in __wake_up_common_lock

Hello,

syzbot found the following crash on:

HEAD commit:    62967898789d Merge git://git.kernel.org/pub/scm/linux/kern..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=10f0bf08c00000
kernel config:  https://syzkaller.appspot.com/x/.config?x=4fceea9e2d99ac20
dashboard link: https://syzkaller.appspot.com/bug?extid=fb065bc06d3d4054be6f
compiler:       gcc (GCC) 9.0.0 20181231 (experimental)

Unfortunately, I don't have any reproducer for this crash yet.

IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+fb065bc06d3d4054be6f@...kaller.appspotmail.com

QAT: Invalid ioctl
==================================================================
BUG: KASAN: use-after-free in debug_spin_lock_before  
kernel/locking/spinlock_debug.c:83 [inline]
BUG: KASAN: use-after-free in do_raw_spin_lock+0x303/0x360  
kernel/locking/spinlock_debug.c:112
Read of size 4 at addr ffff88808738e92c by task syz-executor1/8644

CPU: 1 PID: 8644 Comm: syz-executor1 Not tainted 5.0.0-rc4+ #50
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS  
Google 01/01/2011
Call Trace:
  <IRQ>
  __dump_stack lib/dump_stack.c:77 [inline]
  dump_stack+0x1db/0x2d0 lib/dump_stack.c:113
  print_address_description.cold+0x7c/0x20d mm/kasan/report.c:187
  kasan_report.cold+0x1b/0x40 mm/kasan/report.c:317
  __asan_report_load4_noabort+0x14/0x20 mm/kasan/generic_report.c:134
  debug_spin_lock_before kernel/locking/spinlock_debug.c:83 [inline]
  do_raw_spin_lock+0x303/0x360 kernel/locking/spinlock_debug.c:112
  __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:117 [inline]
  _raw_spin_lock_irqsave+0x9d/0xcd kernel/locking/spinlock.c:152
  __wake_up_common_lock+0x19b/0x390 kernel/sched/wait.c:120
  __wake_up+0xe/0x10 kernel/sched/wait.c:145
  dev_expire_timer+0x14b/0x570 drivers/isdn/mISDN/timerdev.c:174
  call_timer_fn+0x254/0x900 kernel/time/timer.c:1325
  expire_timers kernel/time/timer.c:1362 [inline]
  __run_timers+0x6fc/0xd50 kernel/time/timer.c:1681
IPVS: ftp: loaded support on port[0] = 21
  run_timer_softirq+0x52/0xb0 kernel/time/timer.c:1694
  __do_softirq+0x30b/0xb11 kernel/softirq.c:292
  invoke_softirq kernel/softirq.c:373 [inline]
  irq_exit+0x180/0x1d0 kernel/softirq.c:413
  exiting_irq arch/x86/include/asm/apic.h:536 [inline]
  smp_apic_timer_interrupt+0x1b7/0x760 arch/x86/kernel/apic/apic.c:1062
  apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:807
  </IRQ>
RIP: 0010:arch_local_irq_restore arch/x86/include/asm/paravirt.h:766  
[inline]
RIP: 0010:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:160  
[inline]
RIP: 0010:_raw_spin_unlock_irqrestore+0x95/0xe0  
kernel/locking/spinlock.c:184
Code: 48 c7 c0 30 82 92 89 48 ba 00 00 00 00 00 fc ff df 48 c1 e8 03 80 3c  
10 00 75 39 48 83 3d 12 d0 9d 01 00 74 24 48 89 df 57 9d <0f> 1f 44 00 00  
bf 01 00 00 00 e8 dc 75 63 f9 65 8b 05 95 3b 0d 78
RSP: 0018:ffff888050a7f360 EFLAGS: 00000282 ORIG_RAX: ffffffffffffff13
RAX: 1ffffffff1325046 RBX: 0000000000000282 RCX: 0000000000000000
RDX: dffffc0000000000 RSI: 0000000000000001 RDI: 0000000000000282
RBP: ffff888050a7f370 R08: ffff888088b9e000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: ffffffff8b72b128
R13: ffff888088b9e000 R14: 00000000000d7480 R15: ffffffff8b72b128
  __debug_object_init+0x1c0/0x12d0 lib/debugobjects.c:418
  debug_object_init+0x16/0x20 lib/debugobjects.c:431
  __init_work+0x50/0x60 kernel/workqueue.c:504
  call_usermodehelper_setup+0x133/0x410 kernel/umh.c:389
  call_modprobe kernel/kmod.c:94 [inline]
  __request_module+0x4f5/0xeea kernel/kmod.c:171
  crypto_larval_lookup crypto/api.c:237 [inline]
  crypto_alg_mod_lookup+0x54e/0x6d0 crypto/api.c:280
QAT: Invalid ioctl
  crypto_find_alg crypto/api.c:504 [inline]
  crypto_alloc_tfm+0xd9/0x2f0 crypto/api.c:537
  crypto_alloc_skcipher+0x2d/0x40 crypto/skcipher.c:945
  cryptd_alloc_skcipher+0x121/0x270 crypto/cryptd.c:1226
IPVS: ftp: loaded support on port[0] = 21
  simd_skcipher_init+0x6c/0x1c0 crypto/simd.c:119
  crypto_skcipher_init_tfm+0x299/0x8c0 crypto/skcipher.c:862
  crypto_create_tfm+0xec/0x310 crypto/api.c:471
  crypto_alloc_tfm+0x104/0x2f0 crypto/api.c:543
  crypto_alloc_skcipher+0x2d/0x40 crypto/skcipher.c:945
QAT: Invalid ioctl
  skcipher_bind+0x26/0x30 crypto/algif_skcipher.c:310
  alg_bind+0x25d/0x570 crypto/af_alg.c:183
  __sys_bind+0x30b/0x420 net/socket.c:1483
  __do_sys_bind net/socket.c:1494 [inline]
  __se_sys_bind net/socket.c:1492 [inline]
  __x64_sys_bind+0x73/0xb0 net/socket.c:1492
  do_syscall_64+0x1a3/0x800 arch/x86/entry/common.c:290
  entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x458089
Code: 6d b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7  
48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff  
ff 0f 83 3b b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007f7508d5ac78 EFLAGS: 00000246 ORIG_RAX: 0000000000000031
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000458089
RDX: 0000000000000058 RSI: 0000000020000340 RDI: 000000000000000a
RBP: 000000000073bf00 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f7508d5b6d4
R13: 00000000004be0ca R14: 00000000004ce420 R15: 00000000ffffffff

Allocated by task 8647:
  save_stack+0x45/0xd0 mm/kasan/common.c:73
  set_track mm/kasan/common.c:85 [inline]
  __kasan_kmalloc mm/kasan/common.c:496 [inline]
  __kasan_kmalloc.constprop.0+0xcf/0xe0 mm/kasan/common.c:469
  kasan_kmalloc+0x9/0x10 mm/kasan/common.c:504
  kmem_cache_alloc_trace+0x151/0x760 mm/slab.c:3609
  kmalloc include/linux/slab.h:545 [inline]
  mISDN_open+0x104/0x3f0 drivers/isdn/mISDN/timerdev.c:59
  misc_open+0x398/0x4c0 drivers/char/misc.c:141
  chrdev_open+0x270/0x7c0 fs/char_dev.c:417
  do_dentry_open+0x48a/0x1210 fs/open.c:771
  vfs_open+0xa0/0xd0 fs/open.c:880
  do_last fs/namei.c:3418 [inline]
  path_openat+0x144f/0x5650 fs/namei.c:3534
  do_filp_open+0x26f/0x370 fs/namei.c:3564
  do_sys_open+0x59a/0x7c0 fs/open.c:1063
  __do_sys_openat fs/open.c:1090 [inline]
  __se_sys_openat fs/open.c:1084 [inline]
  __x64_sys_openat+0x9d/0x100 fs/open.c:1084
  do_syscall_64+0x1a3/0x800 arch/x86/entry/common.c:290
  entry_SYSCALL_64_after_hwframe+0x49/0xbe

Freed by task 8649:
  save_stack+0x45/0xd0 mm/kasan/common.c:73
  set_track mm/kasan/common.c:85 [inline]
  __kasan_slab_free+0x102/0x150 mm/kasan/common.c:458
  kasan_slab_free+0xe/0x10 mm/kasan/common.c:466
  __cache_free mm/slab.c:3487 [inline]
  kfree+0xcf/0x230 mm/slab.c:3806
  mISDN_close+0x39b/0x530 drivers/isdn/mISDN/timerdev.c:97
  __fput+0x3c5/0xb10 fs/file_table.c:278
  ____fput+0x16/0x20 fs/file_table.c:309
  task_work_run+0x1f4/0x2b0 kernel/task_work.c:113
  tracehook_notify_resume include/linux/tracehook.h:188 [inline]
  exit_to_usermode_loop+0x32a/0x3b0 arch/x86/entry/common.c:166
  prepare_exit_to_usermode arch/x86/entry/common.c:197 [inline]
  syscall_return_slowpath arch/x86/entry/common.c:268 [inline]
  do_syscall_64+0x696/0x800 arch/x86/entry/common.c:293
  entry_SYSCALL_64_after_hwframe+0x49/0xbe

The buggy address belongs to the object at ffff88808738e900
  which belongs to the cache kmalloc-192 of size 192
The buggy address is located 44 bytes inside of
  192-byte region [ffff88808738e900, ffff88808738e9c0)
The buggy address belongs to the page:
page:ffffea00021ce380 count:1 mapcount:0 mapping:ffff88812c3f0040 index:0x0
flags: 0x1fffc0000000200(slab)
raw: 01fffc0000000200 ffffea0002927088 ffffea000298ecc8 ffff88812c3f0040
raw: 0000000000000000 ffff88808738e000 0000000100000010 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
  ffff88808738e800: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  ffff88808738e880: 00 00 fc fc fc fc fc fc fc fc fc fc fc fc fc fc
> ffff88808738e900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                   ^
  ffff88808738e980: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
  ffff88808738ea00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
==================================================================


---
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