IPVS: ftp: loaded support on port[0] = 21 ================================================================== BUG: KASAN: use-after-free in hci_chan_del+0x14f/0x190 net/bluetooth/hci_conn.c:1707 Read of size 8 at addr ffff88809e507a18 by task syz-executor003/6822 CPU: 1 PID: 6822 Comm: syz-executor003 Not tainted 5.8.0-rc7-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/0x436 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:1707 l2cap_conn_del+0x61b/0x9e0 net/bluetooth/l2cap_core.c:1900 l2cap_disconn_cfm net/bluetooth/l2cap_core.c:8159 [inline] l2cap_disconn_cfm+0x85/0xa0 net/bluetooth/l2cap_core.c:8152 hci_disconn_cfm include/net/bluetooth/hci_core.h:1355 [inline] hci_conn_hash_flush+0x114/0x220 net/bluetooth/hci_conn.c:1536 hci_dev_do_close+0x5c6/0x1080 net/bluetooth/hci_core.c:1761 hci_unregister_dev+0x1a3/0xe20 net/bluetooth/hci_core.c:3606 vhci_release+0x70/0xe0 drivers/bluetooth/hci_vhci.c:340 __fput+0x33c/0x880 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+0xb72/0x2a40 kernel/exit.c:805 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+0x60/0xe0 arch/x86/entry/common.c:384 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x444fe8 Code: Bad RIP value. RSP: 002b:00007ffe7ecfe498 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 RAX: ffffffffffffffda RBX: 0000000000000001 RCX: 0000000000444fe8 RDX: 0000000000000001 RSI: 000000000000003c RDI: 0000000000000001 RBP: 00000000004ccdd0 R08: 00000000000000e7 R09: ffffffffffffffd0 R10: 00007ff8654309d0 R11: 0000000000000246 R12: 0000000000000001 R13: 00000000006e0200 R14: 0000000000000000 R15: 0000000000000000 Allocated by task 6843: save_stack+0x1b/0x40 mm/kasan/common.c:48 set_track mm/kasan/common.c:56 [inline] __kasan_kmalloc.constprop.0+0xc2/0xd0 mm/kasan/common.c:494 kmem_cache_alloc_trace+0x14f/0x2d0 mm/slab.c:3551 kmalloc include/linux/slab.h:555 [inline] kzalloc include/linux/slab.h:669 [inline] hci_chan_create+0x9b/0x330 net/bluetooth/hci_conn.c:1692 l2cap_conn_add.part.0+0x1e/0xe10 net/bluetooth/l2cap_core.c:7699 l2cap_conn_add net/bluetooth/l2cap_core.c:8139 [inline] l2cap_connect_cfm+0x23b/0x1090 net/bluetooth/l2cap_core.c:8097 hci_connect_cfm include/net/bluetooth/hci_core.h:1340 [inline] hci_remote_features_evt net/bluetooth/hci_event.c:3210 [inline] hci_event_packet+0x3e01/0x86f5 net/bluetooth/hci_event.c:6061 hci_rx_work+0x22e/0xb10 net/bluetooth/hci_core.c:4705 process_one_work+0x94c/0x1670 kernel/workqueue.c:2269 worker_thread+0x64c/0x1120 kernel/workqueue.c:2415 kthread+0x3b5/0x4a0 kernel/kthread.c:291 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:293 Freed by task 6843: save_stack+0x1b/0x40 mm/kasan/common.c:48 set_track mm/kasan/common.c:56 [inline] kasan_set_free_info mm/kasan/common.c:316 [inline] __kasan_slab_free+0xf5/0x140 mm/kasan/common.c:455 __cache_free mm/slab.c:3426 [inline] kfree+0x103/0x2c0 mm/slab.c:3757 hci_disconn_loglink_complete_evt net/bluetooth/hci_event.c:4999 [inline] hci_event_packet+0x319a/0x86f5 net/bluetooth/hci_event.c:6188 hci_rx_work+0x22e/0xb10 net/bluetooth/hci_core.c:4705 process_one_work+0x94c/0x1670 kernel/workqueue.c:2269 worker_thread+0x64c/0x1120 kernel/workqueue.c:2415 kthread+0x3b5/0x4a0 kernel/kthread.c:291 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:293 The buggy address belongs to the object at ffff88809e507a00 which belongs to the cache kmalloc-128 of size 128 The buggy address is located 24 bytes inside of 128-byte region [ffff88809e507a00, ffff88809e507a80) The buggy address belongs to the page: page:ffffea00027941c0 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff88809e507700 flags: 0xfffe0000000200(slab) raw: 00fffe0000000200 ffffea0002845008 ffffea000248f0c8 ffff8880aa000700 raw: ffff88809e507700 ffff88809e507000 0000000100000008 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff88809e507900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88809e507980: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff88809e507a00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88809e507a80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88809e507b00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ==================================================================