IPVS: ftp: loaded support on port[0] = 21
==================================================================
BUG: KASAN: use-after-free in hci_chan_del+0x14f/0x190 net/bluetooth/hci_conn.c:1728
Read of size 8 at addr ffff8880a6e02518 by task syz-executor336/6843
CPU: 0 PID: 6843 Comm: syz-executor336 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]
__ia32_sys_exit_group+0x3a/0x50 kernel/exit.c:912
do_syscall_32_irqs_on arch/x86/entry/common.c:84 [inline]
__do_fast_syscall_32+0x57/0x80 arch/x86/entry/common.c:126
do_fast_syscall_32+0x2f/0x70 arch/x86/entry/common.c:149
entry_SYSENTER_compat_after_hwframe+0x4d/0x5c
RIP: 0023:0xf7f3c549
Code: Bad RIP value.
RSP: 002b:00000000ffde827c EFLAGS: 00000292 ORIG_RAX: 00000000000000fc
RAX: ffffffffffffffda RBX: 0000000000000001 RCX: 00000000080fd318
RDX: 0000000000000000 RSI: 00000000080e32e0 RDI: 00000000080fd320
RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
Allocated by task 1544:
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]
kzalloc include/linux/slab.h:666 [inline]
hci_chan_create+0x9b/0x330 net/bluetooth/hci_conn.c:1713
l2cap_conn_add.part.0+0x1e/0xe10 net/bluetooth/l2cap_core.c:7698
l2cap_conn_add net/bluetooth/l2cap_core.c:8140 [inline]
l2cap_connect_cfm+0x23b/0x1090 net/bluetooth/l2cap_core.c:8098
hci_connect_cfm include/net/bluetooth/hci_core.h:1423 [inline]
le_conn_complete_evt+0x1153/0x1740 net/bluetooth/hci_event.c:5190
hci_le_conn_complete_evt net/bluetooth/hci_event.c:5215 [inline]
hci_le_meta_evt+0x745/0x3ff0 net/bluetooth/hci_event.c:5915
hci_event_packet+0x2e25/0x87a8 net/bluetooth/hci_event.c:6192
hci_rx_work+0x22e/0xb50 net/bluetooth/hci_core.c:4889
process_one_work+0x94c/0x1670 kernel/workqueue.c:2269
worker_thread+0x64c/0x1120 kernel/workqueue.c:2415
kthread+0x3b5/0x4a0 kernel/kthread.c:292
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294
Freed by task 6846:
kasan_save_stack+0x1b/0x40 mm/kasan/common.c:48
kasan_set_track+0x1c/0x30 mm/kasan/common.c:56
kasan_set_free_info+0x1b/0x30 mm/kasan/generic.c:355
__kasan_slab_free+0xd8/0x120 mm/kasan/common.c:422
__cache_free mm/slab.c:3418 [inline]
kfree+0x103/0x2c0 mm/slab.c:3756
hci_disconn_loglink_complete_evt net/bluetooth/hci_event.c:5018 [inline]
hci_event_packet+0x3e33/0x87a8 net/bluetooth/hci_event.c:6213
hci_rx_work+0x22e/0xb50 net/bluetooth/hci_core.c:4889
process_one_work+0x94c/0x1670 kernel/workqueue.c:2269
worker_thread+0x64c/0x1120 kernel/workqueue.c:2415
kthread+0x3b5/0x4a0 kernel/kthread.c:292
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294
The buggy address belongs to the object at ffff8880a6e02500
which belongs to the cache kmalloc-128 of size 128
The buggy address is located 24 bytes inside of
128-byte region [ffff8880a6e02500, ffff8880a6e02580)
The buggy address belongs to the page:
page:00000000cfe807a5 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff8880a6e02900 pfn:0xa6e02
flags: 0xfffe0000000200(slab)
raw: 00fffe0000000200 ffffea0002a10cc8 ffffea0002a5ad08 ffff8880aa040400
raw: ffff8880a6e02900 ffff8880a6e02000 000000010000000c 0000000000000000
page dumped because: kasan: bad access detected
Memory state around the buggy address:
ffff8880a6e02400: 00 00 00 00 00 00 00 00 00 00 00 00 00 fc fc fc
ffff8880a6e02480: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff8880a6e02500: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff8880a6e02580: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
ffff8880a6e02600: 00 00 00 00 00 00 00 00 00 00 00 00 00 fc fc fc
==================================================================