==================================================================
BUG: KASAN: slab-use-after-free in hci_conn_hash_flush+0x1f9/0x230
Read of size 8 at addr ffff88800a3a2000 by task syz-executor.1/10372
CPU: 1 PID: 10372 Comm: syz-executor.1 Not tainted 6.3.0-rc4-next-20230331 #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_rfkill_set_block+0x17b/0x1c0
rfkill_set_block+0x1fd/0x540
rfkill_fop_write+0x2b7/0x540
vfs_write+0x2d8/0xdc0
ksys_write+0x1f4/0x260
do_syscall_64+0x3f/0x90
entry_SYSCALL_64_after_hwframe+0x72/0xdc
RIP: 0033:0x7f65df590b19
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f65dcac4188 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f65df6a40e0 RCX: 00007f65df590b19
RDX: 0000000000000008 RSI: 0000000020000080 RDI: 0000000000000006
RBP: 00007f65df5eaf6d R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffe0a4602ef R14: 00007f65dcac4300 R15: 0000000000022000
Allocated by task 4032:
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 10372:
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_rfkill_set_block+0x17b/0x1c0
rfkill_set_block+0x1fd/0x540
rfkill_fop_write+0x2b7/0x540
vfs_write+0x2d8/0xdc0
ksys_write+0x1f4/0x260
do_syscall_64+0x3f/0x90
entry_SYSCALL_64_after_hwframe+0x72/0xdc
The buggy address belongs to the object at ffff88800a3a2000
which belongs to the cache kmalloc-4k of size 4096
The buggy address is located 0 bytes inside of
freed 4096-byte region [ffff88800a3a2000, ffff88800a3a3000)
The buggy address belongs to the physical page:
page:000000005960d405 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff88800a3a6000 pfn:0xa3a0
head:000000005960d405 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 ffffea0001137810 ffffea000027d410
raw: ffff88800a3a6000 0000000000040003 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected
Memory state around the buggy address:
ffff88800a3a1f00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
ffff88800a3a1f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff88800a3a2000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff88800a3a2080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff88800a3a2100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
general protection fault, probably for non-canonical address 0xe0c21c4f00000510: 0000 [#1] PREEMPT SMP KASAN NOPTI
KASAN: maybe wild-memory-access in range [0x0611027800002880-0x0611027800002887]
CPU: 0 PID: 10372 Comm: syz-executor.1 Tainted: G B 6.3.0-rc4-next-20230331 #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:ffff88804176fab0 EFLAGS: 00010213
RAX: dffffc0000000000 RBX: 0611027800002884 RCX: ffffffff83d94453
RDX: 00c2204f00000510 RSI: 0000000000000008 RDI: ffff88804396a208
RBP: ffff88800a3a2000 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000001 R12: ffff88804396a200
R13: ffff88800a3a2240 R14: dffffc0000000000 R15: ffff88800feb8000
FS: 00007f65dcac4700(0000) GS:ffff88806ce00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b2ea23000 CR3: 000000000c814000 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_rfkill_set_block+0x17b/0x1c0
rfkill_set_block+0x1fd/0x540
rfkill_fop_write+0x2b7/0x540
vfs_write+0x2d8/0xdc0
ksys_write+0x1f4/0x260
do_syscall_64+0x3f/0x90
entry_SYSCALL_64_after_hwframe+0x72/0xdc
RIP: 0033:0x7f65df590b19
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f65dcac4188 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f65df6a40e0 RCX: 00007f65df590b19
RDX: 0000000000000008 RSI: 0000000020000080 RDI: 0000000000000006
RBP: 00007f65df5eaf6d R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffe0a4602ef R14: 00007f65dcac4300 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:ffff88804176fab0 EFLAGS: 00010213
RAX: dffffc0000000000 RBX: 0611027800002884 RCX: ffffffff83d94453
RDX: 00c2204f00000510 RSI: 0000000000000008 RDI: ffff88804396a208
RBP: ffff88800a3a2000 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000001 R12: ffff88804396a200
R13: ffff88800a3a2240 R14: dffffc0000000000 R15: ffff88800feb8000
FS: 00007f65dcac4700(0000) GS:ffff88806ce00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b2ea23000 CR3: 000000000c814000 CR4: 0000000000350ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
----------------
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