==================================================================
BUG: KASAN: slab-use-after-free in hci_conn_hash_flush+0x1f9/0x230
Read of size 8 at addr ffff888042862000 by task syz-executor.4/7240
CPU: 0 PID: 7240 Comm: syz-executor.4 Not tainted 6.3.0-rc3-next-20230324 #1
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014
Call Trace:
dump_stack_lvl+0x91/0xf0
print_report+0xcc/0x620
kasan_report+0xc0/0xf0
hci_conn_hash_flush+0x1f9/0x230
hci_dev_close_sync+0x57f/0xff0
hci_unregister_dev+0x15e/0x410
vhci_release+0x80/0x100
__fput+0x263/0xa40
task_work_run+0x174/0x280
do_exit+0xad8/0x2720
do_group_exit+0xd4/0x2a0
get_signal+0x263c/0x26c0
arch_do_signal_or_restart+0x79/0x590
exit_to_user_mode_prepare+0xeb/0x180
syscall_exit_to_user_mode+0x1d/0x50
do_syscall_64+0x4c/0x90
entry_SYSCALL_64_after_hwframe+0x72/0xdc
RIP: 0033:0x7f1069bedb19
Code: Unable to access opcode bytes at 0x7f1069bedaef.
RSP: 002b:00007f1067163218 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: fffffffffffffe00 RBX: 00007f1069d00f68 RCX: 00007f1069bedb19
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007f1069d00f68
RBP: 00007f1069d00f60 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f1069d00f6c
R13: 00007ffc982f3baf R14: 00007f1067163300 R15: 0000000000022000
Allocated by task 7015:
kasan_save_stack+0x22/0x50
kasan_set_track+0x25/0x30
__kasan_kmalloc+0x7f/0x90
hci_conn_add+0xa3/0x1470
hci_connect_sco+0x422/0x9d0
sco_sock_connect+0x358/0xa60
__sys_connect_file+0x159/0x1a0
__sys_connect+0x169/0x1a0
__x64_sys_connect+0x73/0xb0
do_syscall_64+0x3f/0x90
entry_SYSCALL_64_after_hwframe+0x72/0xdc
Freed by task 7240:
kasan_save_stack+0x22/0x50
kasan_set_track+0x25/0x30
kasan_save_free_info+0x2e/0x50
__kasan_slab_free+0x10a/0x190
__kmem_cache_free+0xd1/0x2f0
device_release+0xa6/0x240
kobject_put+0x177/0x270
put_device+0x1f/0x30
hci_conn_del+0x28f/0x940
hci_conn_del+0x6cf/0x940
hci_conn_hash_flush+0x195/0x230
hci_dev_close_sync+0x57f/0xff0
hci_unregister_dev+0x15e/0x410
vhci_release+0x80/0x100
__fput+0x263/0xa40
task_work_run+0x174/0x280
do_exit+0xad8/0x2720
do_group_exit+0xd4/0x2a0
get_signal+0x263c/0x26c0
arch_do_signal_or_restart+0x79/0x590
exit_to_user_mode_prepare+0xeb/0x180
syscall_exit_to_user_mode+0x1d/0x50
do_syscall_64+0x4c/0x90
entry_SYSCALL_64_after_hwframe+0x72/0xdc
The buggy address belongs to the object at ffff888042862000
which belongs to the cache kmalloc-4k of size 4096
The buggy address is located 0 bytes inside of
freed 4096-byte region [ffff888042862000, ffff888042863000)
The buggy address belongs to the physical page:
page:0000000004976f4d refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff888042866000 pfn:0x42860
head:0000000004976f4d order:3 entire_mapcount:0 nr_pages_mapped:0 pincount:0
flags: 0x100000000010200(slab|head|node=0|zone=1)
page_type: 0xffffffff()
raw: 0100000000010200 ffff888008442140 ffff888008440a08 ffffea00003e1e10
raw: ffff888042866000 0000000000040003 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected
Memory state around the buggy address:
ffff888042861f00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
ffff888042861f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff888042862000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff888042862080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff888042862100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
general protection fault, probably for non-canonical address 0xe0ecdc4a80000389: 0000 [#1] PREEMPT SMP KASAN NOPTI
KASAN: maybe wild-memory-access in range [0x0767025400001c48-0x0767025400001c4f]
CPU: 0 PID: 7240 Comm: syz-executor.4 Tainted: G B 6.3.0-rc3-next-20230324 #1
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014
RIP: 0010:hci_conn_cleanup+0x1c5/0x780
Code: fc ff df 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 ef 04 00 00 48 89 da 49 89 5c 24 08 48 b8 00 00 00 00 00 fc ff df 48 c1 ea 03 <80> 3c 02 00 0f 85 ab 04 00 00 48 b8 22 01 00 00 00 00 ad de 4c 89
RSP: 0018:ffff8880446678e8 EFLAGS: 00010212
RAX: dffffc0000000000 RBX: 0767025400001c48 RCX: ffffffff83d86003
RDX: 00ece04a80000389 RSI: 0000000000000008 RDI: ffff888016c8d508
RBP: ffff888042862000 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000001 R12: ffff888016c8d500
R13: ffff888042862240 R14: dffffc0000000000 R15: ffff888018f50000
FS: 0000000000000000(0000) GS:ffff88806ce00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00005611b842cbe8 CR3: 000000000f51c000 CR4: 0000000000350ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
hci_conn_del+0x28f/0x940
hci_conn_hash_flush+0x195/0x230
hci_dev_close_sync+0x57f/0xff0
hci_unregister_dev+0x15e/0x410
vhci_release+0x80/0x100
__fput+0x263/0xa40
task_work_run+0x174/0x280
do_exit+0xad8/0x2720
do_group_exit+0xd4/0x2a0
get_signal+0x263c/0x26c0
arch_do_signal_or_restart+0x79/0x590
exit_to_user_mode_prepare+0xeb/0x180
syscall_exit_to_user_mode+0x1d/0x50
do_syscall_64+0x4c/0x90
entry_SYSCALL_64_after_hwframe+0x72/0xdc
RIP: 0033:0x7f1069bedb19
Code: Unable to access opcode bytes at 0x7f1069bedaef.
RSP: 002b:00007f1067163218 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: fffffffffffffe00 RBX: 00007f1069d00f68 RCX: 00007f1069bedb19
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007f1069d00f68
RBP: 00007f1069d00f60 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f1069d00f6c
R13: 00007ffc982f3baf R14: 00007f1067163300 R15: 0000000000022000
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:hci_conn_cleanup+0x1c5/0x780
Code: fc ff df 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 ef 04 00 00 48 89 da 49 89 5c 24 08 48 b8 00 00 00 00 00 fc ff df 48 c1 ea 03 <80> 3c 02 00 0f 85 ab 04 00 00 48 b8 22 01 00 00 00 00 ad de 4c 89
RSP: 0018:ffff8880446678e8 EFLAGS: 00010212
RAX: dffffc0000000000 RBX: 0767025400001c48 RCX: ffffffff83d86003
RDX: 00ece04a80000389 RSI: 0000000000000008 RDI: ffff888016c8d508
RBP: ffff888042862000 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000001 R12: ffff888016c8d500
R13: ffff888042862240 R14: dffffc0000000000 R15: ffff888018f50000
FS: 0000000000000000(0000) GS:ffff88806ce00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00005611b842cbe8 CR3: 000000000f51c000 CR4: 0000000000350ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Fixing recursive fault but reboot is needed!
BUG: scheduling while atomic: syz-executor.4/7240/0x00000000
INFO: lockdep is turned off.
Modules linked in:
CPU: 0 PID: 7240 Comm: syz-executor.4 Tainted: G B D 6.3.0-rc3-next-20230324 #1
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014
Call Trace:
dump_stack_lvl+0xc1/0xf0
__schedule_bug+0xb9/0x100
__schedule+0x1df9/0x2a00
do_task_dead+0xd5/0x100
make_task_dead+0x36e/0x3b0
rewind_stack_and_make_dead+0x17/0x20
RIP: 0033:0x7f1069bedb19
Code: Unable to access opcode bytes at 0x7f1069bedaef.
RSP: 002b:00007f1067163218 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: fffffffffffffe00 RBX: 00007f1069d00f68 RCX: 00007f1069bedb19
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007f1069d00f68
RBP: 00007f1069d00f60 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f1069d00f6c
R13: 00007ffc982f3baf R14: 00007f1067163300 R15: 0000000000022000
----------------
Code disassembly (best guess), 2 bytes skipped:
0: df 48 89 fisttps -0x77(%rax)
3: fa cli
4: 48 c1 ea 03 shr $0x3,%rdx
8: 80 3c 02 00 cmpb $0x0,(%rdx,%rax,1)
c: 0f 85 ef 04 00 00 jne 0x501
12: 48 89 da mov %rbx,%rdx
15: 49 89 5c 24 08 mov %rbx,0x8(%r12)
1a: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax
21: fc ff df
24: 48 c1 ea 03 shr $0x3,%rdx
* 28: 80 3c 02 00 cmpb $0x0,(%rdx,%rax,1) <-- trapping instruction
2c: 0f 85 ab 04 00 00 jne 0x4dd
32: 48 b8 22 01 00 00 00 movabs $0xdead000000000122,%rax
39: 00 ad de
3c: 4c rex.WR
3d: 89 .byte 0x89