==================================================================
BUG: KASAN: slab-use-after-free in hci_send_acl+0x48/0xe70 net/bluetooth/hci_core.c:3285
Read of size 8 at addr ffff88801f41d118 by task kworker/0:3/4810

CPU: 0 PID: 4810 Comm: kworker/0:3 Not tainted 6.8.0-rc3-next-20240209-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/25/2024
Workqueue: events l2cap_info_timeout
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x241/0x360 lib/dump_stack.c:114
 print_address_description mm/kasan/report.c:377 [inline]
 print_report+0x169/0x550 mm/kasan/report.c:488
 kasan_report+0x143/0x180 mm/kasan/report.c:601
 hci_send_acl+0x48/0xe70 net/bluetooth/hci_core.c:3285
 l2cap_send_conn_req net/bluetooth/l2cap_core.c:1203 [inline]
 l2cap_start_connection+0x247/0x390 net/bluetooth/l2cap_core.c:1358
 l2cap_conn_start+0xc0b/0x1140 net/bluetooth/l2cap_core.c:1500
 process_one_work kernel/workqueue.c:3143 [inline]
 process_scheduled_works+0x9d7/0x1730 kernel/workqueue.c:3223
 worker_thread+0x86d/0xd70 kernel/workqueue.c:3304
 kthread+0x2f0/0x390 kernel/kthread.c:388
 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:242
 </TASK>

Allocated by task 3765:
 kasan_save_stack mm/kasan/common.c:47 [inline]
 kasan_save_track+0x3f/0x80 mm/kasan/common.c:68
 poison_kmalloc_redzone mm/kasan/common.c:370 [inline]
 __kasan_kmalloc+0x98/0xb0 mm/kasan/common.c:387
 kasan_kmalloc include/linux/kasan.h:211 [inline]
 kmalloc_trace+0x1d9/0x360 mm/slub.c:4013
 kmalloc include/linux/slab.h:590 [inline]
 kzalloc include/linux/slab.h:711 [inline]
 hci_chan_create+0xc8/0x310 net/bluetooth/hci_conn.c:2732
 l2cap_conn_add+0x69/0x9c0 net/bluetooth/l2cap_core.c:6833
 l2cap_chan_connect+0x61f/0xeb0 net/bluetooth/l2cap_core.c:7039
 l2cap_sock_connect+0x5c9/0x800 net/bluetooth/l2cap_sock.c:256
 kernel_connect+0x10b/0x160 net/socket.c:3625
 rfcomm_session_create net/bluetooth/rfcomm/core.c:811 [inline]
 __rfcomm_dlc_open net/bluetooth/rfcomm/core.c:388 [inline]
 rfcomm_dlc_open+0x7cc/0x1270 net/bluetooth/rfcomm/core.c:431
 rfcomm_sock_connect+0x305/0x610 net/bluetooth/rfcomm/sock.c:409
 __sys_connect_file net/socket.c:2048 [inline]
 __sys_connect+0x2df/0x310 net/socket.c:2065
 __do_sys_connect net/socket.c:2075 [inline]
 __se_sys_connect net/socket.c:2072 [inline]
 __x64_sys_connect+0x7a/0x90 net/socket.c:2072
 do_syscall_64+0xfb/0x240
 entry_SYSCALL_64_after_hwframe+0x6d/0x75

Freed by task 52:
 kasan_save_stack mm/kasan/common.c:47 [inline]
 kasan_save_track+0x3f/0x80 mm/kasan/common.c:68
 kasan_save_free_info+0x40/0x50 mm/kasan/generic.c:586
 poison_slab_object+0xa6/0xe0 mm/kasan/common.c:240
 __kasan_slab_free+0x37/0x60 mm/kasan/common.c:256
 kasan_slab_free include/linux/kasan.h:184 [inline]
 slab_free_hook mm/slub.c:2122 [inline]
 slab_free mm/slub.c:4296 [inline]
 kfree+0x14a/0x380 mm/slub.c:4406
 hci_chan_list_flush net/bluetooth/hci_conn.c:2772 [inline]
 hci_conn_cleanup net/bluetooth/hci_conn.c:151 [inline]
 hci_conn_del+0x4bc/0xc70 net/bluetooth/hci_conn.c:1126
 hci_abort_conn_sync+0x583/0xde0 net/bluetooth/hci_sync.c:5361
 hci_cmd_sync_work+0x22b/0x400 net/bluetooth/hci_sync.c:306
 process_one_work kernel/workqueue.c:3143 [inline]
 process_scheduled_works+0x9d7/0x1730 kernel/workqueue.c:3223
 worker_thread+0x86d/0xd70 kernel/workqueue.c:3304
 kthread+0x2f0/0x390 kernel/kthread.c:388
 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:242

The buggy address belongs to the object at ffff88801f41d100
 which belongs to the cache kmalloc-128 of size 128
The buggy address is located 24 bytes inside of
 freed 128-byte region [ffff88801f41d100, ffff88801f41d180)

The buggy address belongs to the physical page:
page:ffffea00007d0740 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1f41d
anon flags: 0xfff80000000800(slab|node=0|zone=1|lastcpupid=0xfff)
page_type: 0xffffffff()
raw: 00fff80000000800 ffff888014c418c0 ffffea00008c3a00 dead000000000005
raw: 0000000000000000 0000000000100010 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 0, migratetype Unmovable, gfp_mask 0x112cc0(GFP_USER|__GFP_NOWARN|__GFP_NORETRY), pid 14997, tgid 14997 (udevadm), ts 884846358347, free_ts 884810586603
 set_page_owner include/linux/page_owner.h:31 [inline]
 post_alloc_hook+0x1ea/0x210 mm/page_alloc.c:1539
 prep_new_page mm/page_alloc.c:1546 [inline]
 get_page_from_freelist+0x34eb/0x3680 mm/page_alloc.c:3353
 __alloc_pages+0x256/0x6a0 mm/page_alloc.c:4609
 __alloc_pages_node include/linux/gfp.h:238 [inline]
 alloc_pages_node include/linux/gfp.h:261 [inline]
 alloc_slab_page+0x5f/0x160 mm/slub.c:2191
 allocate_slab mm/slub.c:2354 [inline]
 new_slab+0x84/0x2f0 mm/slub.c:2407
 ___slab_alloc+0xc73/0x1260 mm/slub.c:3541
 __slab_alloc mm/slub.c:3626 [inline]
 __slab_alloc_node mm/slub.c:3679 [inline]
 slab_alloc_node mm/slub.c:3851 [inline]
 kmalloc_trace+0x267/0x360 mm/slub.c:4008
 kmalloc include/linux/slab.h:590 [inline]
 kzalloc include/linux/slab.h:711 [inline]
 kernfs_get_open_node fs/kernfs/file.c:525 [inline]
 kernfs_fop_open+0x800/0xcd0 fs/kernfs/file.c:693
 do_dentry_open+0x907/0x15a0 fs/open.c:953
 do_open fs/namei.c:3639 [inline]
 path_openat+0x2860/0x3240 fs/namei.c:3796
 do_filp_open+0x235/0x490 fs/namei.c:3823
 do_sys_openat2+0x13e/0x1d0 fs/open.c:1404
 do_sys_open fs/open.c:1419 [inline]
 __do_sys_openat fs/open.c:1435 [inline]
 __se_sys_openat fs/open.c:1430 [inline]
 __x64_sys_openat+0x247/0x2a0 fs/open.c:1430
 do_syscall_64+0xfb/0x240
 entry_SYSCALL_64_after_hwframe+0x6d/0x75
page last free pid 13368 tgid 13368 stack trace:
 reset_page_owner include/linux/page_owner.h:24 [inline]
 free_pages_prepare mm/page_alloc.c:1140 [inline]
 free_unref_page_prepare+0x968/0xa90 mm/page_alloc.c:2388
 free_unref_page+0x37/0x3f0 mm/page_alloc.c:2528
 vfree+0x186/0x2e0 mm/vmalloc.c:3252
 delayed_vfree_work+0x56/0x80 mm/vmalloc.c:3173
 process_one_work kernel/workqueue.c:3143 [inline]
 process_scheduled_works+0x9d7/0x1730 kernel/workqueue.c:3223
 worker_thread+0x86d/0xd70 kernel/workqueue.c:3304
 kthread+0x2f0/0x390 kernel/kthread.c:388
 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:242

Memory state around the buggy address:
 ffff88801f41d000: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff88801f41d080: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff88801f41d100: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                            ^
 ffff88801f41d180: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff88801f41d200: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
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