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* KASAN: use-after-free Write in hci_sock_release
@ 2018-10-23 14:38 syzbot
  2019-01-04  9:27 ` syzbot
  2019-03-22 12:04 ` syzbot
  0 siblings, 2 replies; 6+ messages in thread
From: syzbot @ 2018-10-23 14:38 UTC (permalink / raw)
  To: davem, johan.hedberg, linux-bluetooth, linux-kernel, marcel,
	netdev, syzkaller-bugs

Hello,

syzbot found the following crash on:

HEAD commit:    8c60c36d0b8c Add linux-next specific files for 20181019
git tree:       linux-next
console output: https://syzkaller.appspot.com/x/log.txt?x=163a6499400000
kernel config:  https://syzkaller.appspot.com/x/.config?x=8b6d7c4c81535e89
dashboard link: https://syzkaller.appspot.com/bug?extid=b364ed862aa07c74bc62
compiler:       gcc (GCC) 8.0.1 20180413 (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+b364ed862aa07c74bc62@syzkaller.appspotmail.com

F2FS-fs (loop5): Can't find valid F2FS filesystem in 1th superblock
F2FS-fs (loop5): Magic Mismatch, valid(0xf2f52010) - read(0x0)
F2FS-fs (loop5): Can't find valid F2FS filesystem in 2th superblock
==================================================================
BUG: KASAN: use-after-free in atomic_dec  
include/asm-generic/atomic-instrumented.h:127 [inline]
BUG: KASAN: use-after-free in hci_sock_release+0x14f/0x3b0  
net/bluetooth/hci_sock.c:873
Write of size 4 at addr ffff880182f492a0 by task syz-executor0/7470

CPU: 1 PID: 7470 Comm: syz-executor0 Not tainted 4.19.0-rc8-next-20181019+  
#98
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+0x244/0x39d lib/dump_stack.c:113
  print_address_description.cold.7+0x9/0x1ff mm/kasan/report.c:256
  kasan_report_error mm/kasan/report.c:354 [inline]
  kasan_report.cold.8+0x242/0x309 mm/kasan/report.c:412
  check_memory_region_inline mm/kasan/kasan.c:260 [inline]
  check_memory_region+0x13e/0x1b0 mm/kasan/kasan.c:267
  kasan_check_write+0x14/0x20 mm/kasan/kasan.c:278
  atomic_dec include/asm-generic/atomic-instrumented.h:127 [inline]
  hci_sock_release+0x14f/0x3b0 net/bluetooth/hci_sock.c:873
  __sock_release+0xd7/0x250 net/socket.c:580
  sock_close+0x19/0x20 net/socket.c:1142
  __fput+0x3bc/0xa70 fs/file_table.c:279
  ____fput+0x15/0x20 fs/file_table.c:312
  task_work_run+0x1e8/0x2a0 kernel/task_work.c:113
  tracehook_notify_resume include/linux/tracehook.h:188 [inline]
  exit_to_usermode_loop+0x318/0x380 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+0x6be/0x820 arch/x86/entry/common.c:293
  entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x457569
Code: fd b3 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 cb b3 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007fb9b189cc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000031
RAX: 0000000000000000 RBX: 0000000000000003 RCX: 0000000000457569
RDX: 000000000000000c RSI: 0000000020000240 RDI: 0000000000000006
RBP: 000000000072bfa0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007fb9b189d6d4
R13: 00000000004bd6a4 R14: 00000000004cbf20 R15: 00000000ffffffff

Allocated by task 7468:
  save_stack+0x43/0xd0 mm/kasan/kasan.c:448
  set_track mm/kasan/kasan.c:460 [inline]
  kasan_kmalloc+0xc7/0xe0 mm/kasan/kasan.c:553
  kmem_cache_alloc_trace+0x152/0x750 mm/slab.c:3620
  kmalloc include/linux/slab.h:546 [inline]
  kzalloc include/linux/slab.h:741 [inline]
  hci_alloc_dev+0x228/0x21a0 net/bluetooth/hci_core.c:3116
  __vhci_create_device+0x102/0x580 drivers/bluetooth/hci_vhci.c:114
  vhci_create_device drivers/bluetooth/hci_vhci.c:163 [inline]
  vhci_get_user drivers/bluetooth/hci_vhci.c:219 [inline]
  vhci_write+0x2de/0x470 drivers/bluetooth/hci_vhci.c:299
  call_write_iter include/linux/fs.h:1844 [inline]
  new_sync_write fs/read_write.c:474 [inline]
  __vfs_write+0x6b8/0x9f0 fs/read_write.c:487
  vfs_write+0x1fc/0x560 fs/read_write.c:549
  ksys_write+0x101/0x260 fs/read_write.c:598
  __do_sys_write fs/read_write.c:610 [inline]
  __se_sys_write fs/read_write.c:607 [inline]
  __x64_sys_write+0x73/0xb0 fs/read_write.c:607
  do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290
  entry_SYSCALL_64_after_hwframe+0x49/0xbe

Freed by task 7467:
  save_stack+0x43/0xd0 mm/kasan/kasan.c:448
  set_track mm/kasan/kasan.c:460 [inline]
  __kasan_slab_free+0x102/0x150 mm/kasan/kasan.c:521
  kasan_slab_free+0xe/0x10 mm/kasan/kasan.c:528
  __cache_free mm/slab.c:3498 [inline]
  kfree+0xcf/0x230 mm/slab.c:3817
  bt_host_release+0x19/0x30 net/bluetooth/hci_sysfs.c:86
  device_release+0x7e/0x210 drivers/base/core.c:891
  kobject_cleanup lib/kobject.c:662 [inline]
  kobject_release lib/kobject.c:691 [inline]
  kref_put include/linux/kref.h:70 [inline]
  kobject_put.cold.9+0x287/0x2e4 lib/kobject.c:708
  put_device+0x20/0x30 drivers/base/core.c:2024
  hci_free_dev+0x19/0x20 net/bluetooth/hci_core.c:3208
  vhci_release+0x7e/0xf0 drivers/bluetooth/hci_vhci.c:355
  __fput+0x3bc/0xa70 fs/file_table.c:279
  ____fput+0x15/0x20 fs/file_table.c:312
  task_work_run+0x1e8/0x2a0 kernel/task_work.c:113
  tracehook_notify_resume include/linux/tracehook.h:188 [inline]
  exit_to_usermode_loop+0x318/0x380 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+0x6be/0x820 arch/x86/entry/common.c:293
  entry_SYSCALL_64_after_hwframe+0x49/0xbe

The buggy address belongs to the object at ffff880182f48240
  which belongs to the cache kmalloc-8k of size 8192
The buggy address is located 4192 bytes inside of
  8192-byte region [ffff880182f48240, ffff880182f4a240)
The buggy address belongs to the page:
page:ffffea00060bd200 count:1 mapcount:0 mapping:ffff8801da802080 index:0x0  
compound_mapcount: 0
flags: 0x2fffc0000010200(slab|head)
raw: 02fffc0000010200 ffffea000610f708 ffff8801da801b48 ffff8801da802080
raw: 0000000000000000 ffff880182f48240 0000000100000001 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
  ffff880182f49180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
  ffff880182f49200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
> ffff880182f49280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                ^
  ffff880182f49300: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
  ffff880182f49380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
audit: type=1800 audit(1540276897.489:32): pid=7430 uid=0 auid=4294967295  
ses=4294967295 subj==unconfined op=collect_data cause=failed(directio)  
comm="syz-executor5" name="file0" dev="sda1" ino=16559 res=0
syz-executor5 (7430) used greatest stack depth: 14640 bytes left


---
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@googlegroups.com.

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

^ permalink raw reply	[flat|nested] 6+ messages in thread

* Re: KASAN: use-after-free Write in hci_sock_release
  2018-10-23 14:38 KASAN: use-after-free Write in hci_sock_release syzbot
@ 2019-01-04  9:27 ` syzbot
  2019-03-22 12:04 ` syzbot
  1 sibling, 0 replies; 6+ messages in thread
From: syzbot @ 2019-01-04  9:27 UTC (permalink / raw)
  To: davem, johan.hedberg, linux-bluetooth, linux-kernel, marcel,
	netdev, syzkaller-bugs

syzbot has found a reproducer for the following crash on:

HEAD commit:    645ff1e8e704 Merge branch 'for-linus' of git://git.kernel...
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=1303e2bb400000
kernel config:  https://syzkaller.appspot.com/x/.config?x=7308e68273924137
dashboard link: https://syzkaller.appspot.com/bug?extid=b364ed862aa07c74bc62
compiler:       gcc (GCC) 9.0.0 20181231 (experimental)
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=152532bb400000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=13f73320c00000

IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+b364ed862aa07c74bc62@syzkaller.appspotmail.com

==================================================================
BUG: KASAN: use-after-free in atomic_dec  
include/asm-generic/atomic-instrumented.h:127 [inline]
BUG: KASAN: use-after-free in hci_sock_release+0x154/0x3c0  
net/bluetooth/hci_sock.c:873
Write of size 4 at addr ffff888098651620 by task syz-executor472/8899

CPU: 1 PID: 8899 Comm: syz-executor472 Not tainted 4.20.0+ #8
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+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
  check_memory_region_inline mm/kasan/generic.c:185 [inline]
  check_memory_region+0x123/0x190 mm/kasan/generic.c:191
  kasan_check_write+0x14/0x20 mm/kasan/common.c:106
  atomic_dec include/asm-generic/atomic-instrumented.h:127 [inline]
  hci_sock_release+0x154/0x3c0 net/bluetooth/hci_sock.c:873
  __sock_release+0xd3/0x250 net/socket.c:579
  sock_close+0x1b/0x30 net/socket.c:1141
  __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
RIP: 0033:0x446419
Code: e8 0c e8 ff ff 48 83 c4 18 c3 0f 1f 80 00 00 00 00 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 7b 08 fc ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007ff91cfd4da8 EFLAGS: 00000246 ORIG_RAX: 0000000000000003
RAX: 0000000000000000 RBX: 00000000006dbc28 RCX: 0000000000446419
RDX: 0000000000446419 RSI: 0000000000446419 RDI: 0000000000000004
RBP: 00000000006dbc20 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000006dbc2c
R13: 6368762f7665642f R14: 00007ff91cfd59c0 R15: 00000000006dbd2c

Allocated by task 8889:
  save_stack+0x45/0xd0 mm/kasan/common.c:73
  set_track mm/kasan/common.c:85 [inline]
  kasan_kmalloc mm/kasan/common.c:482 [inline]
  kasan_kmalloc+0xcf/0xe0 mm/kasan/common.c:455
  kmem_cache_alloc_trace+0x151/0x760 mm/slab.c:3607
  kmalloc include/linux/slab.h:545 [inline]
  kzalloc include/linux/slab.h:740 [inline]
  hci_alloc_dev+0x148/0x21a0 net/bluetooth/hci_core.c:3116
  __vhci_create_device+0x101/0x5a0 drivers/bluetooth/hci_vhci.c:114
  vhci_create_device drivers/bluetooth/hci_vhci.c:163 [inline]
  vhci_get_user drivers/bluetooth/hci_vhci.c:219 [inline]
  vhci_write+0x2d0/0x470 drivers/bluetooth/hci_vhci.c:299
  call_write_iter include/linux/fs.h:1862 [inline]
  new_sync_write fs/read_write.c:474 [inline]
  __vfs_write+0x764/0xb40 fs/read_write.c:487
  vfs_write+0x20c/0x580 fs/read_write.c:549
  ksys_write+0x105/0x260 fs/read_write.c:598
  __do_sys_write fs/read_write.c:610 [inline]
  __se_sys_write fs/read_write.c:607 [inline]
  __x64_sys_write+0x73/0xb0 fs/read_write.c:607
  do_syscall_64+0x1a3/0x800 arch/x86/entry/common.c:290
  entry_SYSCALL_64_after_hwframe+0x49/0xbe

Freed by task 8888:
  save_stack+0x45/0xd0 mm/kasan/common.c:73
kobject: 'rfkill320' (00000000e0cb8fff): fill_kobj_path: path  
= '/devices/virtual/bluetooth/hci4/rfkill320'
  set_track mm/kasan/common.c:85 [inline]
  __kasan_slab_free+0x102/0x150 mm/kasan/common.c:444
  kasan_slab_free+0xe/0x10 mm/kasan/common.c:452
  __cache_free mm/slab.c:3485 [inline]
  kfree+0xcf/0x230 mm/slab.c:3804
  bt_host_release+0x19/0x30 net/bluetooth/hci_sysfs.c:86
  device_release+0x7d/0x210 drivers/base/core.c:919
  kobject_cleanup lib/kobject.c:662 [inline]
  kobject_release lib/kobject.c:691 [inline]
  kref_put include/linux/kref.h:67 [inline]
  kobject_put.cold+0x28f/0x2ec lib/kobject.c:708
  put_device+0x20/0x30 drivers/base/core.c:2060
  hci_free_dev+0x19/0x20 net/bluetooth/hci_core.c:3208
  vhci_release+0x7e/0xf0 drivers/bluetooth/hci_vhci.c:355
kobject: 'rfkill313' (00000000d3ffb8c5): kobject_uevent_env
  __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
kobject: 'rfkill313' (00000000d3ffb8c5): fill_kobj_path: path  
= '/devices/virtual/bluetooth/hci2/rfkill313'
  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 ffff8880986505c0
  which belongs to the cache kmalloc-8k of size 8192
The buggy address is located 4192 bytes inside of
  8192-byte region [ffff8880986505c0, ffff8880986525c0)
The buggy address belongs to the page:
kobject: 'rfkill313' (00000000d3ffb8c5): kobject_cleanup, parent            
(null)
page:ffffea0002619400 count:1 mapcount:0 mapping:ffff88812c3f2080 index:0x0  
compound_mapcount: 0
flags: 0x1fffc0000010200(slab|head)
raw: 01fffc0000010200 ffffea0002616508 ffffea0002302f08 ffff88812c3f2080
raw: 0000000000000000 ffff8880986505c0 0000000100000001 0000000000000000
kobject: 'rfkill313' (00000000d3ffb8c5): calling ktype release
page dumped because: kasan: bad access detected

Memory state around the buggy address:
  ffff888098651500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
  ffff888098651580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
kobject: 'rfkill313': free name
> ffff888098651600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                ^
  ffff888098651680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
  ffff888098651700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================


^ permalink raw reply	[flat|nested] 6+ messages in thread

* Re: KASAN: use-after-free Write in hci_sock_release
  2018-10-23 14:38 KASAN: use-after-free Write in hci_sock_release syzbot
  2019-01-04  9:27 ` syzbot
@ 2019-03-22 12:04 ` syzbot
  2019-03-22 12:16   ` Dmitry Vyukov
  1 sibling, 1 reply; 6+ messages in thread
From: syzbot @ 2019-03-22 12:04 UTC (permalink / raw)
  To: davem, johan.hedberg, linux-bluetooth, linux-kbuild,
	linux-kernel, marcel, mmarek, netdev, syzkaller-bugs, torvalds

syzbot has bisected this bug to:

commit c470abd4fde40ea6a0846a2beab642a578c0b8cd
Author: Linus Torvalds <torvalds@linux-foundation.org>
Date:   Sun Feb 19 22:34:00 2017 +0000

     Linux 4.10

bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=1664c6df200000
start commit:   c470abd4 Linux 4.10
git tree:       upstream
kernel config:  https://syzkaller.appspot.com/x/.config?x=7308e68273924137
dashboard link: https://syzkaller.appspot.com/bug?extid=b364ed862aa07c74bc62
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=152532bb400000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=13f73320c00000

Reported-by: syzbot+b364ed862aa07c74bc62@syzkaller.appspotmail.com
Fixes: c470abd4fde4 ("Linux 4.10")

For information about bisection process see: https://goo.gl/tpsmEJ#bisection

^ permalink raw reply	[flat|nested] 6+ messages in thread

* Re: KASAN: use-after-free Write in hci_sock_release
  2019-03-22 12:04 ` syzbot
@ 2019-03-22 12:16   ` Dmitry Vyukov
  2019-03-23 20:25     ` Cong Wang
  0 siblings, 1 reply; 6+ messages in thread
From: Dmitry Vyukov @ 2019-03-22 12:16 UTC (permalink / raw)
  To: syzbot
  Cc: David Miller, Johan Hedberg, linux-bluetooth,
	open list:KERNEL BUILD + fi...,
	LKML, Marcel Holtmann, Michal Marek, netdev, syzkaller-bugs,
	Linus Torvalds

On Fri, Mar 22, 2019 at 1:04 PM syzbot
<syzbot+b364ed862aa07c74bc62@syzkaller.appspotmail.com> wrote:
>
> syzbot has bisected this bug to:
>
> commit c470abd4fde40ea6a0846a2beab642a578c0b8cd
> Author: Linus Torvalds <torvalds@linux-foundation.org>
> Date:   Sun Feb 19 22:34:00 2017 +0000
>
>      Linux 4.10
>
> bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=1664c6df200000
> start commit:   c470abd4 Linux 4.10
> git tree:       upstream
> kernel config:  https://syzkaller.appspot.com/x/.config?x=7308e68273924137
> dashboard link: https://syzkaller.appspot.com/bug?extid=b364ed862aa07c74bc62
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=152532bb400000
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=13f73320c00000
>
> Reported-by: syzbot+b364ed862aa07c74bc62@syzkaller.appspotmail.com
> Fixes: c470abd4fde4 ("Linux 4.10")
>
> For information about bisection process see: https://goo.gl/tpsmEJ#bisection

The same story of HCI being broken before v4.10, so this is bisected
to the release.

^ permalink raw reply	[flat|nested] 6+ messages in thread

* Re: KASAN: use-after-free Write in hci_sock_release
  2019-03-22 12:16   ` Dmitry Vyukov
@ 2019-03-23 20:25     ` Cong Wang
  2019-03-25  8:04       ` Dmitry Vyukov
  0 siblings, 1 reply; 6+ messages in thread
From: Cong Wang @ 2019-03-23 20:25 UTC (permalink / raw)
  To: Dmitry Vyukov
  Cc: syzbot, David Miller, Johan Hedberg, linux-bluetooth,
	open list:KERNEL BUILD + fi...,
	LKML, Marcel Holtmann, Michal Marek, netdev, syzkaller-bugs,
	Linus Torvalds

On Fri, Mar 22, 2019 at 5:19 AM Dmitry Vyukov <dvyukov@google.com> wrote:
>
> On Fri, Mar 22, 2019 at 1:04 PM syzbot
> <syzbot+b364ed862aa07c74bc62@syzkaller.appspotmail.com> wrote:
> >
> > syzbot has bisected this bug to:
> >
> > commit c470abd4fde40ea6a0846a2beab642a578c0b8cd
> > Author: Linus Torvalds <torvalds@linux-foundation.org>
> > Date:   Sun Feb 19 22:34:00 2017 +0000
> >
> >      Linux 4.10
> >
> > bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=1664c6df200000
> > start commit:   c470abd4 Linux 4.10
> > git tree:       upstream
> > kernel config:  https://syzkaller.appspot.com/x/.config?x=7308e68273924137
> > dashboard link: https://syzkaller.appspot.com/bug?extid=b364ed862aa07c74bc62
> > syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=152532bb400000
> > C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=13f73320c00000
> >
> > Reported-by: syzbot+b364ed862aa07c74bc62@syzkaller.appspotmail.com
> > Fixes: c470abd4fde4 ("Linux 4.10")
> >
> > For information about bisection process see: https://goo.gl/tpsmEJ#bisection
>
> The same story of HCI being broken before v4.10, so this is bisected
> to the release.

Does syzbot test the latest upstream? Isn't this supposed to be fixed by

commit e20a2e9c42c9e4002d9e338d74e7819e88d77162
Author: Myungho Jung <mhjungk@gmail.com>
Date:   Sat Feb 2 16:56:36 2019 -0800

    Bluetooth: Fix decrementing reference count twice in releasing socket

?

^ permalink raw reply	[flat|nested] 6+ messages in thread

* Re: KASAN: use-after-free Write in hci_sock_release
  2019-03-23 20:25     ` Cong Wang
@ 2019-03-25  8:04       ` Dmitry Vyukov
  0 siblings, 0 replies; 6+ messages in thread
From: Dmitry Vyukov @ 2019-03-25  8:04 UTC (permalink / raw)
  To: Cong Wang
  Cc: syzbot, David Miller, Johan Hedberg, linux-bluetooth,
	open list:KERNEL BUILD + fi...,
	LKML, Marcel Holtmann, Michal Marek, netdev, syzkaller-bugs,
	Linus Torvalds

On Sat, Mar 23, 2019 at 9:25 PM Cong Wang <xiyou.wangcong@gmail.com> wrote:
>
> On Fri, Mar 22, 2019 at 5:19 AM Dmitry Vyukov <dvyukov@google.com> wrote:
> >
> > On Fri, Mar 22, 2019 at 1:04 PM syzbot
> > <syzbot+b364ed862aa07c74bc62@syzkaller.appspotmail.com> wrote:
> > >
> > > syzbot has bisected this bug to:
> > >
> > > commit c470abd4fde40ea6a0846a2beab642a578c0b8cd
> > > Author: Linus Torvalds <torvalds@linux-foundation.org>
> > > Date:   Sun Feb 19 22:34:00 2017 +0000
> > >
> > >      Linux 4.10
> > >
> > > bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=1664c6df200000
> > > start commit:   c470abd4 Linux 4.10
> > > git tree:       upstream
> > > kernel config:  https://syzkaller.appspot.com/x/.config?x=7308e68273924137
> > > dashboard link: https://syzkaller.appspot.com/bug?extid=b364ed862aa07c74bc62
> > > syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=152532bb400000
> > > C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=13f73320c00000
> > >
> > > Reported-by: syzbot+b364ed862aa07c74bc62@syzkaller.appspotmail.com
> > > Fixes: c470abd4fde4 ("Linux 4.10")
> > >
> > > For information about bisection process see: https://goo.gl/tpsmEJ#bisection
> >
> > The same story of HCI being broken before v4.10, so this is bisected
> > to the release.
>
> Does syzbot test the latest upstream?

Yes, it does.

> Isn't this supposed to be fixed by
>
> commit e20a2e9c42c9e4002d9e338d74e7819e88d77162
> Author: Myungho Jung <mhjungk@gmail.com>
> Date:   Sat Feb 2 16:56:36 2019 -0800
>
>     Bluetooth: Fix decrementing reference count twice in releasing socket
>
> ?

I and syzbot have no idea. You may know better. Is it? If yes, please
tell syzbot about the fix.

^ permalink raw reply	[flat|nested] 6+ messages in thread

end of thread, back to index

Thread overview: 6+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2018-10-23 14:38 KASAN: use-after-free Write in hci_sock_release syzbot
2019-01-04  9:27 ` syzbot
2019-03-22 12:04 ` syzbot
2019-03-22 12:16   ` Dmitry Vyukov
2019-03-23 20:25     ` Cong Wang
2019-03-25  8:04       ` Dmitry Vyukov

Linux-Bluetooth Archive on lore.kernel.org

Archives are clonable:
	git clone --mirror https://lore.kernel.org/linux-bluetooth/0 linux-bluetooth/git/0.git

	# If you have public-inbox 1.1+ installed, you may
	# initialize and index your mirror using the following commands:
	public-inbox-init -V2 linux-bluetooth linux-bluetooth/ https://lore.kernel.org/linux-bluetooth \
		linux-bluetooth@vger.kernel.org linux-bluetooth@archiver.kernel.org
	public-inbox-index linux-bluetooth


Newsgroup available over NNTP:
	nntp://nntp.lore.kernel.org/org.kernel.vger.linux-bluetooth


AGPL code for this site: git clone https://public-inbox.org/ public-inbox