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SubjectKASAN: use-after-free Write in hci_sock_bind (2)

syzbot found the following crash on:

HEAD commit: f8788d86 Linux 5.6-rc3
git tree: upstream
console output:
kernel config:
dashboard link:
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:

BUG: KASAN: use-after-free in atomic_inc include/asm-generic/atomic-instrumented.h:239 [inline]
BUG: KASAN: use-after-free in hci_sock_bind+0x642/0x12d0 net/bluetooth/hci_sock.c:1250
Write of size 4 at addr ffff888040ed9078 by task syz-executor.2/21693

CPU: 1 PID: 21693 Comm: syz-executor.2 Not tainted 5.6.0-rc3-syzkaller #0
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+0x197/0x210 lib/dump_stack.c:118
print_address_description.constprop.0.cold+0xd4/0x30b mm/kasan/report.c:374
__kasan_report.cold+0x1b/0x32 mm/kasan/report.c:506
kasan_report+0x12/0x20 mm/kasan/common.c:641
check_memory_region_inline mm/kasan/generic.c:185 [inline]
check_memory_region+0x134/0x1a0 mm/kasan/generic.c:192
__kasan_check_write+0x14/0x20 mm/kasan/common.c:101
atomic_inc include/asm-generic/atomic-instrumented.h:239 [inline]
hci_sock_bind+0x642/0x12d0 net/bluetooth/hci_sock.c:1250
__sys_bind+0x239/0x290 net/socket.c:1662
__do_sys_bind net/socket.c:1673 [inline]
__se_sys_bind net/socket.c:1671 [inline]
__x64_sys_bind+0x73/0xb0 net/socket.c:1671
do_syscall_64+0xfa/0x790 arch/x86/entry/common.c:294
RIP: 0033:0x45c449
Code: ad b6 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 7b b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007fef96e6bc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000031
RAX: ffffffffffffffda RBX: 00007fef96e6c6d4 RCX: 000000000045c449
RDX: 0000000000000006 RSI: 00000000200007c0 RDI: 0000000000000006
RBP: 000000000076bf20 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 000000000000002c R14: 00000000004c28c9 R15: 000000000076bf2c

Allocated by task 21692:
save_stack+0x23/0x90 mm/kasan/common.c:72
set_track mm/kasan/common.c:80 [inline]
__kasan_kmalloc mm/kasan/common.c:515 [inline]
__kasan_kmalloc.constprop.0+0xcf/0xe0 mm/kasan/common.c:488
kasan_kmalloc+0x9/0x10 mm/kasan/common.c:529
kmem_cache_alloc_trace+0x158/0x790 mm/slab.c:3551
kmalloc include/linux/slab.h:555 [inline]
kzalloc include/linux/slab.h:669 [inline]
hci_alloc_dev+0x43/0x1e20 net/bluetooth/hci_core.c:3249
__vhci_create_device+0x101/0x5d0 drivers/bluetooth/hci_vhci.c:99
vhci_create_device drivers/bluetooth/hci_vhci.c:148 [inline]
vhci_get_user drivers/bluetooth/hci_vhci.c:205 [inline]
vhci_write+0x2d0/0x470 drivers/bluetooth/hci_vhci.c:285
call_write_iter include/linux/fs.h:1901 [inline]
new_sync_write+0x4d3/0x770 fs/read_write.c:483
__vfs_write+0xe1/0x110 fs/read_write.c:496
vfs_write+0x268/0x5d0 fs/read_write.c:558
ksys_write+0x14f/0x290 fs/read_write.c:611
__do_sys_write fs/read_write.c:623 [inline]
__se_sys_write fs/read_write.c:620 [inline]
__x64_sys_write+0x73/0xb0 fs/read_write.c:620
do_syscall_64+0xfa/0x790 arch/x86/entry/common.c:294

Freed by task 21688:
save_stack+0x23/0x90 mm/kasan/common.c:72
set_track mm/kasan/common.c:80 [inline]
kasan_set_free_info mm/kasan/common.c:337 [inline]
__kasan_slab_free+0x102/0x150 mm/kasan/common.c:476
kasan_slab_free+0xe/0x10 mm/kasan/common.c:485
__cache_free mm/slab.c:3426 [inline]
kfree+0x10a/0x2c0 mm/slab.c:3757
bt_host_release+0x19/0x30 net/bluetooth/hci_sysfs.c:86
device_release+0x7a/0x210 drivers/base/core.c:1358
kobject_cleanup lib/kobject.c:693 [inline]
kobject_release lib/kobject.c:722 [inline]
kref_put include/linux/kref.h:65 [inline]
kobject_put+0x1ff/0x2e0 lib/kobject.c:739
put_device+0x20/0x30 drivers/base/core.c:2586
hci_free_dev+0x19/0x20 net/bluetooth/hci_core.c:3345
vhci_release+0x7e/0xf0 drivers/bluetooth/hci_vhci.c:341
__fput+0x2ff/0x890 fs/file_table.c:280
____fput+0x16/0x20 fs/file_table.c:313
task_work_run+0x145/0x1c0 kernel/task_work.c:113
tracehook_notify_resume include/linux/tracehook.h:188 [inline]
exit_to_usermode_loop+0x316/0x380 arch/x86/entry/common.c:164
prepare_exit_to_usermode arch/x86/entry/common.c:195 [inline]
syscall_return_slowpath arch/x86/entry/common.c:278 [inline]
do_syscall_64+0x676/0x790 arch/x86/entry/common.c:304

The buggy address belongs to the object at ffff888040ed8000
which belongs to the cache kmalloc-8k of size 8192
The buggy address is located 4216 bytes inside of
8192-byte region [ffff888040ed8000, ffff888040eda000)
The buggy address belongs to the page:
page:ffffea000103b600 refcount:1 mapcount:0 mapping:ffff8880aa4021c0 index:0x0 compound_mapcount: 0
flags: 0xfffe0000010200(slab|head)
raw: 00fffe0000010200 ffffea0000fe6b08 ffffea0000fb5408 ffff8880aa4021c0
raw: 0000000000000000 ffff888040ed8000 0000000100000001 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
ffff888040ed8f00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff888040ed8f80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff888040ed9000: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff888040ed9080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff888040ed9100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb

This bug is generated by a bot. It may contain errors.
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