KASAN: use-after-free Read in usbhid_close

* KASAN: use-after-free Read in usbhid_close
@ 2019-09-03 12:08 syzbot
  2019-09-03 12:12 ` Andrey Konovalov
  0 siblings, 1 reply; 2+ messages in thread
From: syzbot @ 2019-09-03 12:08 UTC (permalink / raw)
  To: andreyknvl, benjamin.tissoires, jikos, linux-input, linux-kernel,
	linux-usb, syzkaller-bugs

Hello,

syzbot found the following crash on:

HEAD commit:    eea39f24 usb-fuzzer: main usb gadget fuzzer driver
git tree:       https://github.com/google/kasan.git usb-fuzzer
console output: https://syzkaller.appspot.com/x/log.txt?x=140a786c600000
kernel config:  https://syzkaller.appspot.com/x/.config?x=d0c62209eedfd54e
dashboard link: https://syzkaller.appspot.com/bug?extid=90b997df76897a013829
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+90b997df76897a013829@syzkaller.appspotmail.com

==================================================================
BUG: KASAN: use-after-free in __lock_acquire+0x302a/0x3b50  
kernel/locking/lockdep.c:3753
Read of size 8 at addr ffff8881d34368a0 by task syz-executor.3/10760

CPU: 0 PID: 10760 Comm: syz-executor.3 Not tainted 5.3.0-rc5+ #28
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS  
Google 01/01/2011
Call Trace:
  __dump_stack lib/dump_stack.c:77 [inline]
  dump_stack+0xca/0x13e lib/dump_stack.c:113
  print_address_description+0x6a/0x32c mm/kasan/report.c:351
  __kasan_report.cold+0x1a/0x33 mm/kasan/report.c:482
  kasan_report+0xe/0x12 mm/kasan/common.c:612
  __lock_acquire+0x302a/0x3b50 kernel/locking/lockdep.c:3753
  lock_acquire+0x127/0x320 kernel/locking/lockdep.c:4412
  __raw_spin_lock_irq include/linux/spinlock_api_smp.h:128 [inline]
  _raw_spin_lock_irq+0x2d/0x40 kernel/locking/spinlock.c:167
  spin_lock_irq include/linux/spinlock.h:363 [inline]
  usbhid_close+0x51/0x210 drivers/hid/usbhid/hid-core.c:740
  hid_hw_close+0xa8/0xd0 drivers/hid/hid-core.c:2046
  drop_ref.part.0+0x32/0xe0 drivers/hid/hidraw.c:337
  drop_ref drivers/hid/hidraw.c:360 [inline]
  hidraw_release+0x34f/0x440 drivers/hid/hidraw.c:356
  __fput+0x2d7/0x840 fs/file_table.c:280
  task_work_run+0x13f/0x1c0 kernel/task_work.c:113
  tracehook_notify_resume include/linux/tracehook.h:188 [inline]
  exit_to_usermode_loop+0x1d2/0x200 arch/x86/entry/common.c:163
  prepare_exit_to_usermode arch/x86/entry/common.c:194 [inline]
  syscall_return_slowpath arch/x86/entry/common.c:274 [inline]
  do_syscall_64+0x45f/0x580 arch/x86/entry/common.c:299
  entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x413561
Code: 75 14 b8 03 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 04 1b 00 00 c3 48  
83 ec 08 e8 0a fc ff ff 48 89 04 24 b8 03 00 00 00 0f 05 <48> 8b 3c 24 48  
89 c2 e8 53 fc ff ff 48 89 d0 48 83 c4 08 48 3d 01
RSP: 002b:00007ffc873b3300 EFLAGS: 00000293 ORIG_RAX: 0000000000000003
RAX: 0000000000000000 RBX: 0000000000000006 RCX: 0000000000413561
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000005
RBP: 0000000000000001 R08: 0000000055395a94 R09: 0000000055395a98
R10: 00007ffc873b33e0 R11: 0000000000000293 R12: 000000000075bfc8
R13: 0000000000096f96 R14: 0000000000762460 R15: ffffffffffffffff

The buggy address belongs to the page:
page:ffffea00074d0d80 refcount:0 mapcount:0 mapping:0000000000000000  
index:0x0
flags: 0x200000000000000()
raw: 0200000000000000 0000000000000000 dead000000000122 0000000000000000
raw: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
  ffff8881d3436780: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
  ffff8881d3436800: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
> ffff8881d3436880: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
                                ^
  ffff8881d3436900: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
  ffff8881d3436980: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
==================================================================

---
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