Date:   Tue, 06 Mar 2018 00:30:01 -0800
From:   syzbot <syzbot+09e05aba06723a94d43d@...kaller.appspotmail.com>
To:     arve@...roid.com, devel@...verdev.osuosl.org,
        gregkh@...uxfoundation.org, linux-kernel@...r.kernel.org,
        maco@...roid.com, syzkaller-bugs@...glegroups.com,
        tkjos@...roid.com
Subject: KASAN: use-after-free Read in __list_del_entry_valid (3)

Hello,

syzbot hit the following crash on upstream commit
094b58e1040a44f991d7ab628035e69c4d6b79c9 (Mon Mar 5 19:57:06 2018 +0000)
Merge tag 'linux-kselftest-4.16-rc5' of  
git://git.kernel.org/pub/scm/linux/kernel/git/shuah/linux-kselftest

Unfortunately, I don't have any reproducer for this crash yet.
Raw console output is attached.
compiler: gcc (GCC) 7.1.1 20170620
.config is attached.
user-space arch: i386

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Reported-by: syzbot+09e05aba06723a94d43d@...kaller.appspotmail.com
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binder: release 6174:6185 transaction 4 in, still active
binder: send failed reply for transaction 4 to 6174:6185
binder: 6194:6198 ERROR: BC_REGISTER_LOOPER called without request
==================================================================
binder: 6198 RLIMIT_NICE not set
BUG: KASAN: use-after-free in __list_del_entry_valid+0x144/0x150  
lib/list_debug.c:54
Read of size 8 at addr ffff8801daede810 by task kworker/1:1/24

CPU: 1 PID: 24 Comm: kworker/1:1 Not tainted 4.16.0-rc4+ #252
binder: BINDER_SET_CONTEXT_MGR already set
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS  
Google 01/01/2011
Workqueue: events binder_deferred_func
Call Trace:
  __dump_stack lib/dump_stack.c:17 [inline]
  dump_stack+0x194/0x24d lib/dump_stack.c:53
binder: 6194:6206 got new transaction with bad transaction stack,  
transaction 9 has target 6194:0
  print_address_description+0x73/0x250 mm/kasan/report.c:256
  kasan_report_error mm/kasan/report.c:354 [inline]
  kasan_report+0x23c/0x360 mm/kasan/report.c:412
  __asan_report_load8_noabort+0x14/0x20 mm/kasan/report.c:433
  __list_del_entry_valid+0x144/0x150 lib/list_debug.c:54
  __list_del_entry include/linux/list.h:117 [inline]
  list_del_init include/linux/list.h:159 [inline]
  binder_dequeue_work_head_ilocked drivers/android/binder.c:893 [inline]
  binder_dequeue_work_head drivers/android/binder.c:913 [inline]
  binder_release_work+0x163/0x490 drivers/android/binder.c:4191
binder: 6194:6206 transaction failed 29201/-71, size 0-0 line 2875
binder: 6191:6205 ioctl 40046207 0 returned -16
  binder_thread_release+0x4d0/0x720 drivers/android/binder.c:4396
  binder_deferred_release drivers/android/binder.c:4939 [inline]
  binder_deferred_func+0x4f4/0x1340 drivers/android/binder.c:5022
binder: BINDER_SET_CONTEXT_MGR already set
binder: 6200:6207 ioctl 40046207 0 returned -16
binder: 6191:6208 ERROR: BC_REGISTER_LOOPER called without request
  process_one_work+0xc47/0x1bb0 kernel/workqueue.c:2113
binder: 6208 RLIMIT_NICE not set
binder: 6200:6212 ERROR: BC_REGISTER_LOOPER called without request
binder: 6212 RLIMIT_NICE not set
binder: 6191:6213 got new transaction with bad transaction stack,  
transaction 11 has target 6194:0
  worker_thread+0x223/0x1990 kernel/workqueue.c:2247
binder: 6191:6213 transaction failed 29201/-71, size 0-0 line 2875
binder: 6198 RLIMIT_NICE not set
binder: release 6200:6207 transaction 14 out, still active
binder: undelivered TRANSACTION_COMPLETE
  kthread+0x33c/0x400 kernel/kthread.c:238
  ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:406

Allocated by task 6185:
  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:552
  kmem_cache_alloc_trace+0x136/0x740 mm/slab.c:3607
  kmalloc include/linux/slab.h:512 [inline]
  kzalloc include/linux/slab.h:701 [inline]
  binder_transaction+0x13c1/0x81c0 drivers/android/binder.c:2900
  binder_thread_write+0xb50/0x3840 drivers/android/binder.c:3513
  binder_ioctl_write_read.isra.38+0x261/0xcb0 drivers/android/binder.c:4451
  binder_ioctl+0xb72/0x1417 drivers/android/binder.c:4591
  C_SYSC_ioctl fs/compat_ioctl.c:1461 [inline]
  compat_SyS_ioctl+0x151/0x2a30 fs/compat_ioctl.c:1407
  do_syscall_32_irqs_on arch/x86/entry/common.c:330 [inline]
  do_fast_syscall_32+0x3ec/0xf9f arch/x86/entry/common.c:392
  entry_SYSENTER_compat+0x70/0x7f arch/x86/entry/entry_64_compat.S:139

Freed by task 24:
  save_stack+0x43/0xd0 mm/kasan/kasan.c:447
  set_track mm/kasan/kasan.c:459 [inline]
  __kasan_slab_free+0x11a/0x170 mm/kasan/kasan.c:520
  kasan_slab_free+0xe/0x10 mm/kasan/kasan.c:527
  __cache_free mm/slab.c:3485 [inline]
  kfree+0xd9/0x260 mm/slab.c:3800
  binder_free_transaction+0x6a/0x90 drivers/android/binder.c:1966
  binder_send_failed_reply+0x1c9/0x380 drivers/android/binder.c:2005
  binder_thread_release+0x4bb/0x720 drivers/android/binder.c:4395
  binder_deferred_release drivers/android/binder.c:4939 [inline]
  binder_deferred_func+0x4f4/0x1340 drivers/android/binder.c:5022
  process_one_work+0xc47/0x1bb0 kernel/workqueue.c:2113
  worker_thread+0x223/0x1990 kernel/workqueue.c:2247
  kthread+0x33c/0x400 kernel/kthread.c:238
  ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:406

The buggy address belongs to the object at ffff8801daede800
  which belongs to the cache kmalloc-192 of size 192
The buggy address is located 16 bytes inside of
  192-byte region [ffff8801daede800, ffff8801daede8c0)
The buggy address belongs to the page:
page:ffffea00076bb780 count:1 mapcount:0 mapping:ffff8801daede000 index:0x0
flags: 0x2fffc0000000100(slab)
raw: 02fffc0000000100 ffff8801daede000 0000000000000000 0000000100000010
raw: ffffea0006e746e0 ffffea0006f0b620 ffff8801dac00040 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
  ffff8801daede700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
  ffff8801daede780: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
> ffff8801daede800: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                          ^
  ffff8801daede880: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
  ffff8801daede900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================


---
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