IPVS: ftp: loaded support on port[0] = 21
==================================================================
BUG: KASAN: use-after-free in hci_chan_del+0x33/0x130 net/bluetooth/hci_conn.c:1728
Read of size 8 at addr ffff8880a7b83218 by task syz-executor901/6815

CPU: 1 PID: 6815 Comm: syz-executor901 Not tainted 5.8.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x1f0/0x31e lib/dump_stack.c:118
 print_address_description+0x66/0x5a0 mm/kasan/report.c:383
 __kasan_report mm/kasan/report.c:513 [inline]
 kasan_report+0x132/0x1d0 mm/kasan/report.c:530
 hci_chan_del+0x33/0x130 net/bluetooth/hci_conn.c:1728
 l2cap_conn_del+0x4c2/0x650 net/bluetooth/l2cap_core.c:1900
 hci_disconn_cfm include/net/bluetooth/hci_core.h:1438 [inline]
 hci_conn_hash_flush+0x127/0x200 net/bluetooth/hci_conn.c:1557
 hci_dev_do_close+0xb7b/0x1040 net/bluetooth/hci_core.c:1770
 hci_unregister_dev+0x185/0x1590 net/bluetooth/hci_core.c:3790
 vhci_release+0x73/0xc0 drivers/bluetooth/hci_vhci.c:340
 __fput+0x2f0/0x750 fs/file_table.c:281
 task_work_run+0x137/0x1c0 kernel/task_work.c:135
 exit_task_work include/linux/task_work.h:25 [inline]
 do_exit+0x5f3/0x1f20 kernel/exit.c:806
 do_group_exit+0x161/0x2d0 kernel/exit.c:903
 __do_sys_exit_group+0x13/0x20 kernel/exit.c:914
 __se_sys_exit_group+0x10/0x10 kernel/exit.c:912
 __x64_sys_exit_group+0x37/0x40 kernel/exit.c:912
 do_syscall_64+0x31/0x70 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x445028
Code: Bad RIP value.
RSP: 002b:00007fff7752e7e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 0000000000000001 RCX: 0000000000445028
RDX: 0000000000000001 RSI: 000000000000003c RDI: 0000000000000001
RBP: 00000000004cce10 R08: 00000000000000e7 R09: ffffffffffffffd0
R10: 00007f9b532be9d0 R11: 0000000000000246 R12: 0000000000000001
R13: 00000000006e0200 R14: 000000000248f850 R15: 0000000000000001

Allocated by task 6840:
 save_stack mm/kasan/common.c:48 [inline]
 set_track mm/kasan/common.c:56 [inline]
 __kasan_kmalloc+0x103/0x140 mm/kasan/common.c:494
 kmem_cache_alloc_trace+0x234/0x300 mm/slab.c:3551
 kmalloc include/linux/slab.h:555 [inline]
 kzalloc include/linux/slab.h:669 [inline]
 hci_chan_create+0x9a/0x270 net/bluetooth/hci_conn.c:1713
 l2cap_conn_add+0x66/0xb00 net/bluetooth/l2cap_core.c:7698
 l2cap_connect_cfm+0xdb/0x12b0 net/bluetooth/l2cap_core.c:8098
 hci_connect_cfm include/net/bluetooth/hci_core.h:1423 [inline]
 le_conn_complete_evt+0x88d/0x1380 net/bluetooth/hci_event.c:5190
 hci_le_conn_complete_evt net/bluetooth/hci_event.c:5215 [inline]
 hci_le_meta_evt net/bluetooth/hci_event.c:5915 [inline]
 hci_event_packet+0x16e3/0x17e10 net/bluetooth/hci_event.c:6192
 hci_rx_work+0x246/0xa20 net/bluetooth/hci_core.c:4889
 process_one_work+0x789/0xfc0 kernel/workqueue.c:2269
 worker_thread+0xaa4/0x1460 kernel/workqueue.c:2415
 kthread+0x37e/0x3a0 drivers/block/aoe/aoecmd.c:1234
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294

Freed by task 6840:
 save_stack mm/kasan/common.c:48 [inline]
 set_track mm/kasan/common.c:56 [inline]
 kasan_set_free_info mm/kasan/common.c:316 [inline]
 __kasan_slab_free+0x114/0x170 mm/kasan/common.c:455
 __cache_free mm/slab.c:3426 [inline]
 kfree+0x10a/0x220 mm/slab.c:3757
 hci_disconn_loglink_complete_evt net/bluetooth/hci_event.c:5018 [inline]
 hci_event_packet+0x2018/0x17e10 net/bluetooth/hci_event.c:6213
 hci_rx_work+0x246/0xa20 net/bluetooth/hci_core.c:4889
 process_one_work+0x789/0xfc0 kernel/workqueue.c:2269
 worker_thread+0xaa4/0x1460 kernel/workqueue.c:2415
 kthread+0x37e/0x3a0 drivers/block/aoe/aoecmd.c:1234
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294

The buggy address belongs to the object at ffff8880a7b83200
 which belongs to the cache kmalloc-128 of size 128
The buggy address is located 24 bytes inside of
 128-byte region [ffff8880a7b83200, ffff8880a7b83280)
The buggy address belongs to the page:
page:ffffea00029ee0c0 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff8880a7b83b00
flags: 0xfffe0000000200(slab)
raw: 00fffe0000000200 ffffea00028bdcc8 ffffea000285be88 ffff8880aa400700
raw: ffff8880a7b83b00 ffff8880a7b83000 0000000100000003 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8880a7b83100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff8880a7b83180: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff8880a7b83200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                            ^
 ffff8880a7b83280: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff8880a7b83300: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================