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BUG: KASAN: use-after-free in hci_chan_del+0x14f/0x190 net/bluetooth/hci_conn.c:1728
Read of size 8 at addr ffff88809ea28818 by task syz-executor.3/6893

CPU: 1 PID: 6893 Comm: syz-executor.3 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+0x18f/0x20d lib/dump_stack.c:118
 print_address_description.constprop.0.cold+0xae/0x497 mm/kasan/report.c:383
 __kasan_report mm/kasan/report.c:513 [inline]
 kasan_report.cold+0x1f/0x37 mm/kasan/report.c:530
 hci_chan_del+0x14f/0x190 net/bluetooth/hci_conn.c:1728
 l2cap_conn_del+0x61b/0x9e0 net/bluetooth/l2cap_core.c:1900
 l2cap_disconn_cfm net/bluetooth/l2cap_core.c:8160 [inline]
 l2cap_disconn_cfm+0x85/0xa0 net/bluetooth/l2cap_core.c:8153
 hci_disconn_cfm include/net/bluetooth/hci_core.h:1438 [inline]
 hci_conn_hash_flush+0x114/0x220 net/bluetooth/hci_conn.c:1557
 hci_dev_do_close+0x5c6/0x1080 net/bluetooth/hci_core.c:1770
 hci_unregister_dev+0x1bd/0xe30 net/bluetooth/hci_core.c:3790
 vhci_release+0x70/0xe0 drivers/bluetooth/hci_vhci.c:340
 __fput+0x285/0x920 fs/file_table.c:281
 task_work_run+0xdd/0x190 kernel/task_work.c:135
 exit_task_work include/linux/task_work.h:25 [inline]
 do_exit+0xb7d/0x29f0 kernel/exit.c:806
 do_group_exit+0x125/0x310 kernel/exit.c:903
 __do_sys_exit_group kernel/exit.c:914 [inline]
 __se_sys_exit_group kernel/exit.c:912 [inline]
 __x64_sys_exit_group+0x3a/0x50 kernel/exit.c:912
 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x45ce69
Code: Bad RIP value.
RSP: 002b:00007ffee3627aa8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000045ce69
RDX: 00000000004168c1 RSI: 00000000016a85f0 RDI: 0000000000000043
RBP: 00000000004c2b1b R08: 000000000000000b R09: 0000000000000000
R10: 0000000001f2b940 R11: 0000000000000246 R12: 0000000000000006
R13: 00007ffee3627bf0 R14: 0000000000154a53 R15: 00007ffee3627c00

Allocated by task 3902:
 kasan_save_stack+0x1b/0x40 mm/kasan/common.c:48
 kasan_set_track mm/kasan/common.c:56 [inline]
 __kasan_kmalloc.constprop.0+0xbf/0xd0 mm/kasan/common.c:461
 kmem_cache_alloc_trace+0x16e/0x2c0 mm/slab.c:3550
 kmalloc include/linux/slab.h:554 [inline]
 kernfs_get_open_node fs/kernfs/file.c:571 [inline]
 kernfs_fop_open+0x957/0xd40 fs/kernfs/file.c:717
 do_dentry_open+0x501/0x1290 fs/open.c:823
 do_open fs/namei.c:3243 [inline]
 path_openat+0x1b9a/0x2730 fs/namei.c:3360
 do_filp_open+0x17e/0x3c0 fs/namei.c:3387
 do_sys_openat2+0x16d/0x420 fs/open.c:1174
 do_sys_open fs/open.c:1190 [inline]
 __do_sys_open fs/open.c:1198 [inline]
 __se_sys_open fs/open.c:1194 [inline]
 __x64_sys_open+0x119/0x1c0 fs/open.c:1194
 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

The buggy address belongs to the object at ffff88809ea28800
 which belongs to the cache kmalloc-128 of size 128
The buggy address is located 24 bytes inside of
 128-byte region [ffff88809ea28800, ffff88809ea28880)
The buggy address belongs to the page:
page:0000000051a3198b refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff88809ea28d00 pfn:0x9ea28
flags: 0xfffe0000000200(slab)
raw: 00fffe0000000200 ffffea0002504648 ffffea000251c788 ffff8880aa040400
raw: ffff88809ea28d00 ffff88809ea28000 000000010000000a 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff88809ea28700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff88809ea28780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff88809ea28800: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                            ^
 ffff88809ea28880: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff88809ea28900: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
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