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 ffff8880a7f29918 by task syz-executor816/6828 CPU: 1 PID: 6828 Comm: syz-executor816 Not tainted 5.8.0-rc7-next-20200731-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: 0033:0x445058 Code: Bad RIP value. RSP: 002b:00007fff7c028748 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 RAX: ffffffffffffffda RBX: 0000000000000001 RCX: 0000000000445058 RDX: 0000000000000001 RSI: 000000000000003c RDI: 0000000000000001 RBP: 00000000004cce30 R08: 00000000000000e7 R09: ffffffffffffffd0 R10: 00007f290ba65700 R11: 0000000000000246 R12: 0000000000000001 R13: 00000000006e0200 R14: 0000000000000000 R15: 0000000000000000 Allocated by task 1545: 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:5187 hci_le_conn_complete_evt net/bluetooth/hci_event.c:5212 [inline] hci_le_meta_evt+0xe55/0x3fd0 net/bluetooth/hci_event.c:5903 hci_event_packet+0x2e25/0x87a8 net/bluetooth/hci_event.c:6180 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 6853: 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:5015 [inline] hci_event_packet+0x3e33/0x87a8 net/bluetooth/hci_event.c:6201 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 ffff8880a7f29900 which belongs to the cache kmalloc-128 of size 128 The buggy address is located 24 bytes inside of 128-byte region [ffff8880a7f29900, ffff8880a7f29980) The buggy address belongs to the page: page:000000008d4feb74 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff8880a7f29f00 pfn:0xa7f29 flags: 0xfffe0000000200(slab) raw: 00fffe0000000200 ffffea00024e54c8 ffffea0002922588 ffff8880aa000400 raw: ffff8880a7f29f00 ffff8880a7f29000 0000000100000008 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8880a7f29800: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8880a7f29880: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff8880a7f29900: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8880a7f29980: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff8880a7f29a00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================