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BUG: KASAN: slab-use-after-free in hci_conn_drop+0x34/0x2a0
Write of size 4 at addr ffff88810de68010 by task kworker/u11:1/5221

CPU: 1 UID: 0 PID: 5221 Comm: kworker/u11:1 Tainted: G             L      syzkaller #0 PREEMPT(full) 
Tainted: [L]=SOFTLOCKUP
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
Workqueue: hci2 hci_cmd_sync_work
Call Trace:
 <TASK>
 dump_stack_lvl+0xe8/0x150
 print_report+0xba/0x230
 kasan_report+0x117/0x150
 kasan_check_range+0x264/0x2c0
 hci_conn_drop+0x34/0x2a0
 hci_cmd_sync_work+0x262/0x400
 process_scheduled_works+0xaec/0x17a0
 worker_thread+0x89f/0xd90
 kthread+0x726/0x8b0
 ret_from_fork+0x51b/0xa40
 ret_from_fork_asm+0x1a/0x30
 </TASK>

Allocated by task 5221:
 kasan_save_track+0x3e/0x80
 __kasan_kmalloc+0x93/0xb0
 __kmalloc_cache_noprof+0x3d1/0x6e0
 __hci_conn_add+0x3c5/0x1b30
 le_conn_complete_evt+0x706/0x1430
 hci_le_conn_complete_evt+0x187/0x470
 hci_event_packet+0x7af/0x12c0
 hci_rx_work+0x3ee/0x1030
 process_scheduled_works+0xaec/0x17a0
 worker_thread+0x89f/0xd90
 kthread+0x726/0x8b0
 ret_from_fork+0x51b/0xa40
 ret_from_fork_asm+0x1a/0x30

Freed by task 23172:
 kasan_save_track+0x3e/0x80
 kasan_save_free_info+0x46/0x50
 __kasan_slab_free+0x5c/0x80
 kfree+0x1be/0x650
 device_release+0x9e/0x1d0
 kobject_put+0x228/0x560
 hci_conn_del+0xc36/0x1230
 hci_disconn_complete_evt+0x64e/0x950
 hci_event_packet+0x805/0x12c0
 hci_rx_work+0x3ee/0x1030
 process_scheduled_works+0xaec/0x17a0
 worker_thread+0x89f/0xd90
 kthread+0x726/0x8b0
 ret_from_fork+0x51b/0xa40
 ret_from_fork_asm+0x1a/0x30

The buggy address belongs to the object at ffff88810de68000
 which belongs to the cache kmalloc-8k of size 8192
The buggy address is located 16 bytes inside of
 freed 8192-byte region [ffff88810de68000, ffff88810de6a000)

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x10de68
head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
flags: 0x17ff00000000040(head|node=0|zone=2|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 017ff00000000040 ffff888100042280 ffffea000418a400 dead000000000004
raw: 0000000000000000 0000000000020002 00000000f5000000 0000000000000000
head: 017ff00000000040 ffff888100042280 ffffea000418a400 dead000000000004
head: 0000000000000000 0000000000020002 00000000f5000000 0000000000000000
head: 017ff00000000003 ffffea0004379a01 00000000ffffffff 00000000ffffffff
head: ffffffffffffffff 0000000000000000 00000000ffffffff 0000000000000008
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 3, migratetype Unmovable, gfp_mask 0x1d20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_HARDWALL), pid 28089, tgid 28086 (syz.8.9152), ts 796278280555, free_ts 794142657148
 post_alloc_hook+0x231/0x280
 get_page_from_freelist+0x24dc/0x2580
 __alloc_frozen_pages_noprof+0x18d/0x380
 alloc_pages_mpol+0x232/0x4a0
 allocate_slab+0x86/0x3a0
 ___slab_alloc+0xd82/0x1760
 __slab_alloc+0x65/0x100
 __kmalloc_cache_noprof+0x40d/0x6e0
 landlock_init_hierarchy_log+0x9e/0x5f0
 landlock_merge_ruleset+0x666/0x900
 __se_sys_landlock_restrict_self+0x28b/0x750
 do_syscall_64+0xe2/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
page last free pid 28015 tgid 28013 stack trace:
 __free_frozen_pages+0xbb9/0xd10
 __put_partials+0x146/0x170
 __slab_free+0x294/0x320
 qlist_free_all+0x97/0x100
 kasan_quarantine_reduce+0x148/0x160
 __kasan_slab_alloc+0x22/0x80
 __kmalloc_noprof+0x3c2/0x7e0
 tomoyo_realpath_from_path+0xe3/0x5d0
 tomoyo_path_number_perm+0x246/0x630
 security_file_ioctl+0xc3/0x2a0
 __se_sys_ioctl+0x47/0x170
 do_syscall_64+0xe2/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Memory state around the buggy address:
 ffff88810de67f00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff88810de67f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff88810de68000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                         ^
 ffff88810de68080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff88810de68100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
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