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BUG: KASAN: slab-use-after-free in sco_chan_del+0xe6/0x440
Write of size 4 at addr ffff888009770010 by task syz-executor.2/23449

CPU: 0 PID: 23449 Comm: syz-executor.2 Not tainted 6.5.0-rc6-next-20230818 #1
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014
Call Trace:
 <TASK>
 dump_stack_lvl+0x91/0xf0
 print_report+0xcc/0x620
 kasan_report+0xbe/0xf0
 kasan_check_range+0x39/0x1b0
 sco_chan_del+0xe6/0x440
 __sco_sock_close+0x21e/0x770
 sco_sock_release+0xa1/0x400
 __sock_release+0xb3/0x270
 sock_close+0x1c/0x30
 __fput+0x400/0xa70
 task_work_run+0x174/0x280
 get_signal+0x1d3/0x2720
 arch_do_signal_or_restart+0x81/0x790
 exit_to_user_mode_prepare+0xeb/0x180
 syscall_exit_to_user_mode+0x1d/0x50
 do_syscall_64+0x4c/0x90
 entry_SYSCALL_64_after_hwframe+0x6e/0xd8
RIP: 0033:0x7f62228e4b19
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:00007f621fe5a188 EFLAGS: 00000246 ORIG_RAX: 000000000000002a
RAX: fffffffffffffffc RBX: 00007f62229f7f60 RCX: 00007f62228e4b19
RDX: 0000000000000008 RSI: 0000000020000040 RDI: 0000000000000004
RBP: 00007f622293ef6d R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fff67e14a4f R14: 00007f621fe5a300 R15: 0000000000022000
 </TASK>

Allocated by task 23449:
 kasan_save_stack+0x22/0x50
 kasan_set_track+0x25/0x30
 __kasan_kmalloc+0x7f/0x90
 hci_conn_add+0xab/0x16c0
 hci_connect_sco+0x3e2/0x1090
 sco_sock_connect+0x2c2/0x9e0
 __sys_connect_file+0x165/0x1b0
 __sys_connect+0x169/0x1a0
 __x64_sys_connect+0x73/0xb0
 do_syscall_64+0x3f/0x90
 entry_SYSCALL_64_after_hwframe+0x6e/0xd8

Freed by task 22247:
 kasan_save_stack+0x22/0x50
 kasan_set_track+0x25/0x30
 kasan_save_free_info+0x2b/0x50
 __kasan_slab_free+0x10a/0x190
 __kmem_cache_free+0xe1/0x330
 device_release+0xa6/0x240
 kobject_put+0x177/0x270
 put_device+0x1f/0x30
 hci_conn_unlink+0x515/0x720
 hci_conn_del+0x4b/0xc40
 hci_abort_conn_sync+0xad3/0xdf0
 abort_conn_sync+0x18f/0x3b0
 hci_cmd_sync_work+0x14a/0x2a0
 process_one_work+0x7c8/0x1450
 worker_thread+0x80e/0x1190
 kthread+0x33f/0x440
 ret_from_fork+0x48/0x80
 ret_from_fork_asm+0x1b/0x30

Last potentially related work creation:
 kasan_save_stack+0x22/0x50
 __kasan_record_aux_stack+0x8e/0xa0
 __queue_work+0x5e6/0x1380
 queue_work_on+0xb6/0xc0
 rcu_core+0x8e1/0x28f0
 __do_softirq+0x1b7/0x7d4

Second to last potentially related work creation:
 kasan_save_stack+0x22/0x50
 __kasan_record_aux_stack+0x8e/0xa0
 __call_rcu_common.constprop.0+0x6a/0xbd0
 deactivate_locked_super+0x147/0x170
 deactivate_super+0xb1/0xd0
 cleanup_mnt+0x2ae/0x3d0
 mntput_no_expire+0x9c7/0xb60
 mntput+0x6b/0x90
 free_ipc+0x184/0x2d0
 process_one_work+0x7c8/0x1450
 worker_thread+0x80e/0x1190
 kthread+0x33f/0x440
 ret_from_fork+0x48/0x80
 ret_from_fork_asm+0x1b/0x30

The buggy address belongs to the object at ffff888009770000
 which belongs to the cache kmalloc-4k of size 4096
The buggy address is located 16 bytes inside of
 freed 4096-byte region [ffff888009770000, ffff888009771000)

The buggy address belongs to the physical page:
page:00000000933e13f0 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x9770
head:00000000933e13f0 order:3 entire_mapcount:0 nr_pages_mapped:0 pincount:0
flags: 0x100000000000840(slab|head|node=0|zone=1)
page_type: 0xffffffff()
raw: 0100000000000840 ffff888008442140 ffffea0000fd0000 dead000000000002
raw: 0000000000000000 0000000080040004 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff88800976ff00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff88800976ff80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff888009770000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                         ^
 ffff888009770080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff888009770100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
Bluetooth: hci1: command 0x0405 tx timeout
Bluetooth: hci1: command 0x0405 tx timeout