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Date:   Tue, 19 Feb 2019 22:45:03 -0800
From:   syzbot <syzbot+899a33dc0fa0dbaf06a6@...kaller.appspotmail.com>
To:     johan.hedberg@...il.com, linux-bluetooth@...r.kernel.org,
        linux-kernel@...r.kernel.org, marcel@...tmann.org,
        syzkaller-bugs@...glegroups.com
Subject: KASAN: use-after-free Read in h5_reset_rx

Hello,

syzbot found the following crash on:

HEAD commit:    7a92eb7cc1dc Add linux-next specific files for 20190215
git tree:       linux-next
console output: https://syzkaller.appspot.com/x/log.txt?x=10b2f400c00000
kernel config:  https://syzkaller.appspot.com/x/.config?x=b16fd68f18a50133
dashboard link: https://syzkaller.appspot.com/bug?extid=899a33dc0fa0dbaf06a6
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+899a33dc0fa0dbaf06a6@...kaller.appspotmail.com

Bluetooth: Invalid header checksum
==================================================================
BUG: KASAN: use-after-free in h5_reset_rx+0xe0/0x100  
drivers/bluetooth/hci_h5.c:544
Read of size 8 at addr ffff88809117be18 by task kworker/u4:4/880

CPU: 1 PID: 880 Comm: kworker/u4:4 Not tainted 5.0.0-rc6-next-20190215 #36
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS  
Google 01/01/2011
Workqueue: events_unbound flush_to_ldisc
Call Trace:
  __dump_stack lib/dump_stack.c:77 [inline]
  dump_stack+0x172/0x1f0 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_load8_noabort+0x14/0x20 mm/kasan/generic_report.c:132
  h5_reset_rx+0xe0/0x100 drivers/bluetooth/hci_h5.c:544
  h5_rx_3wire_hdr+0x2f5/0x3c0 drivers/bluetooth/hci_h5.c:455
  h5_recv+0x30a/0x4c0 drivers/bluetooth/hci_h5.c:578
  hci_uart_tty_receive+0x22b/0x530 drivers/bluetooth/hci_ldisc.c:607
  tty_ldisc_receive_buf+0x164/0x1c0 drivers/tty/tty_buffer.c:465
  tty_port_default_receive_buf+0x7d/0xb0 drivers/tty/tty_port.c:38
  receive_buf drivers/tty/tty_buffer.c:481 [inline]
  flush_to_ldisc+0x228/0x390 drivers/tty/tty_buffer.c:533
  process_one_work+0x98e/0x1790 kernel/workqueue.c:2267
  worker_thread+0x98/0xe40 kernel/workqueue.c:2413
  kthread+0x357/0x430 kernel/kthread.c:253
  ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:352

Allocated by task 6242:
  save_stack+0x45/0xd0 mm/kasan/common.c:75
  set_track mm/kasan/common.c:87 [inline]
  __kasan_kmalloc mm/kasan/common.c:497 [inline]
  __kasan_kmalloc.constprop.0+0xcf/0xe0 mm/kasan/common.c:470
  kasan_kmalloc+0x9/0x10 mm/kasan/common.c:511
  kmem_cache_alloc_trace+0x151/0x760 mm/slab.c:3615
  kmalloc include/linux/slab.h:548 [inline]
  kzalloc include/linux/slab.h:743 [inline]
  h5_open+0x4e4/0x5f0 drivers/bluetooth/hci_h5.c:222
  hci_uart_set_proto drivers/bluetooth/hci_ldisc.c:686 [inline]
  hci_uart_tty_ioctl+0x2d4/0xa70 drivers/bluetooth/hci_ldisc.c:748
  tty_ioctl+0xac9/0x14d0 drivers/tty/tty_io.c:2664
  vfs_ioctl fs/ioctl.c:46 [inline]
  file_ioctl fs/ioctl.c:509 [inline]
  do_vfs_ioctl+0xd6e/0x1390 fs/ioctl.c:696
  ksys_ioctl+0xab/0xd0 fs/ioctl.c:713
  __do_sys_ioctl fs/ioctl.c:720 [inline]
  __se_sys_ioctl fs/ioctl.c:718 [inline]
  __x64_sys_ioctl+0x73/0xb0 fs/ioctl.c:718
  do_syscall_64+0x103/0x610 arch/x86/entry/common.c:290
  entry_SYSCALL_64_after_hwframe+0x49/0xbe

Freed by task 6242:
  save_stack+0x45/0xd0 mm/kasan/common.c:75
  set_track mm/kasan/common.c:87 [inline]
  __kasan_slab_free+0x102/0x150 mm/kasan/common.c:459
  kasan_slab_free+0xe/0x10 mm/kasan/common.c:467
  __cache_free mm/slab.c:3491 [inline]
  kfree+0xcf/0x230 mm/slab.c:3816
  h5_close+0x11a/0x150 drivers/bluetooth/hci_h5.c:266
  hci_uart_set_proto drivers/bluetooth/hci_ldisc.c:696 [inline]
  hci_uart_tty_ioctl+0x839/0xa70 drivers/bluetooth/hci_ldisc.c:748
  tty_ioctl+0xac9/0x14d0 drivers/tty/tty_io.c:2664
  vfs_ioctl fs/ioctl.c:46 [inline]
  file_ioctl fs/ioctl.c:509 [inline]
  do_vfs_ioctl+0xd6e/0x1390 fs/ioctl.c:696
  ksys_ioctl+0xab/0xd0 fs/ioctl.c:713
  __do_sys_ioctl fs/ioctl.c:720 [inline]
  __se_sys_ioctl fs/ioctl.c:718 [inline]
  __x64_sys_ioctl+0x73/0xb0 fs/ioctl.c:718
  do_syscall_64+0x103/0x610 arch/x86/entry/common.c:290
  entry_SYSCALL_64_after_hwframe+0x49/0xbe

The buggy address belongs to the object at ffff88809117bb40
  which belongs to the cache kmalloc-1k of size 1024
The buggy address is located 728 bytes inside of
  1024-byte region [ffff88809117bb40, ffff88809117bf40)
The buggy address belongs to the page:
page:ffffea0002445e80 count:1 mapcount:0 mapping:ffff88812c3f0ac0 index:0x0  
compound_mapcount: 0
flags: 0x1fffc0000010200(slab|head)
raw: 01fffc0000010200 ffffea000226a888 ffffea000097a788 ffff88812c3f0ac0
raw: 0000000000000000 ffff88809117a040 0000000100000007 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
  ffff88809117bd00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
  ffff88809117bd80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
> ffff88809117be00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                             ^
  ffff88809117be80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
  ffff88809117bf00: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
==================================================================


---
This bug is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at syzkaller@...glegroups.com.

syzbot will keep track of this bug report. See:
https://goo.gl/tpsmEJ#bug-status-tracking for how to communicate with  
syzbot.

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