batman_adv: batadv0: Interface deactivated: batadv_slave_0
batman_adv: batadv0: Removing interface: batadv_slave_0
==================================================================
BUG: KASAN: use-after-free in __queue_work+0xa97/0xea0 kernel/workqueue.c:1385
Read of size 4 at addr ffff8881e20bf440 by task syz-executor.3/21154

batman_adv: batadv0: Interface deactivated: batadv_slave_1
CPU: 1 PID: 21154 Comm: syz-executor.3 Not tainted 4.14.217-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:17 [inline]
 dump_stack+0x14b/0x1e7 lib/dump_stack.c:58
batman_adv: batadv0: Removing interface: batadv_slave_1
 print_address_description.cold.6+0x9/0x1ca mm/kasan/report.c:252
 kasan_report_error mm/kasan/report.c:351 [inline]
 kasan_report.cold.7+0x11a/0x2d3 mm/kasan/report.c:409
 __asan_report_load4_noabort+0x14/0x20 mm/kasan/report.c:429
 __queue_work+0xa97/0xea0 kernel/workqueue.c:1385
 queue_work_on+0x140/0x180 kernel/workqueue.c:1490
 queue_work include/linux/workqueue.h:491 [inline]
 req_run+0x2b2/0x590 net/bluetooth/hci_request.c:77
 hci_req_run_skb net/bluetooth/hci_request.c:89 [inline]
 __hci_req_sync+0x297/0x7d0 net/bluetooth/hci_request.c:214
 hci_req_sync+0x70/0xb0 net/bluetooth/hci_request.c:285
 hci_dev_cmd+0x47f/0x670 net/bluetooth/hci_core.c:1865
 hci_sock_ioctl+0x2f0/0x600 net/bluetooth/hci_sock.c:1040
 sock_do_ioctl+0x62/0xa0 net/socket.c:974
 sock_ioctl+0x251/0x430 net/socket.c:1071
 vfs_ioctl fs/ioctl.c:46 [inline]
 file_ioctl fs/ioctl.c:500 [inline]
 do_vfs_ioctl+0x180/0xfb0 fs/ioctl.c:684
 SYSC_ioctl fs/ioctl.c:701 [inline]
 SyS_ioctl+0x74/0x80 fs/ioctl.c:692
 do_syscall_64+0x1c7/0x5b0 arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x46/0xbb
RIP: 0033:0x45cc79
RSP: 002b:00007fc670efbc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 000000000001d300 RCX: 000000000045cc79
RDX: 0000000020000000 RSI: 00000000400448de RDI: 0000000000000004
RBP: 000000000078c080 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000078c04c
R13: 00007ffca583f20f R14: 00007fc670efc9c0 R15: 000000000078c04c

Allocated by task 3096:
 save_stack_trace+0x16/0x20 arch/x86/kernel/stacktrace.c:59
 save_stack mm/kasan/kasan.c:447 [inline]
 set_track mm/kasan/kasan.c:459 [inline]
 kasan_kmalloc.part.1+0x62/0xf0 mm/kasan/kasan.c:551
 kasan_kmalloc+0xaf/0xc0 mm/kasan/kasan.c:536
 __do_kmalloc mm/slab.c:3720 [inline]
 __kmalloc+0x15d/0x410 mm/slab.c:3729
 kmalloc include/linux/slab.h:493 [inline]
 kzalloc include/linux/slab.h:661 [inline]
 __alloc_workqueue_key+0xf8/0xc80 kernel/workqueue.c:4003
 hci_register_dev+0x182/0x750 net/bluetooth/hci_core.c:3099
 __vhci_create_device+0x269/0x4f0 drivers/bluetooth/hci_vhci.c:139
 vhci_create_device drivers/bluetooth/hci_vhci.c:163 [inline]
 vhci_open_timeout+0x34/0x50 drivers/bluetooth/hci_vhci.c:319
 process_one_work+0x74f/0x1620 kernel/workqueue.c:2116
 worker_thread+0xcc/0xed0 kernel/workqueue.c:2250
 kthread+0x338/0x400 kernel/kthread.c:232
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:404

Freed by task 21172:
 save_stack_trace+0x16/0x20 arch/x86/kernel/stacktrace.c:59
 save_stack mm/kasan/kasan.c:447 [inline]
 set_track mm/kasan/kasan.c:459 [inline]
 kasan_slab_free+0xab/0x190 mm/kasan/kasan.c:524
 __cache_free mm/slab.c:3496 [inline]
 kfree+0xcc/0x270 mm/slab.c:3815
 rcu_free_wq+0x99/0xf0 kernel/workqueue.c:3279
 __rcu_reclaim kernel/rcu/rcu.h:195 [inline]
 rcu_do_batch kernel/rcu/tree.c:2699 [inline]
 invoke_rcu_callbacks kernel/rcu/tree.c:2962 [inline]
 __rcu_process_callbacks kernel/rcu/tree.c:2929 [inline]
 rcu_process_callbacks+0x7a5/0x11e0 kernel/rcu/tree.c:2946
 __do_softirq+0x246/0x9b5 kernel/softirq.c:288

The buggy address belongs to the object at ffff8881e20bf2c0
 which belongs to the cache kmalloc-512 of size 512
The buggy address is located 384 bytes inside of
 512-byte region [ffff8881e20bf2c0, ffff8881e20bf4c0)
The buggy address belongs to the page:
page:ffffea0007882fc0 count:1 mapcount:0 mapping:ffff8881e20bf040 index:0x0
flags: 0x17ffe0000000100(slab)
raw: 017ffe0000000100 ffff8881e20bf040 0000000000000000 0000000100000006
raw: ffffea0007777120 ffffea00076bffa0 ffff8881f6000940 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8881e20bf300: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff8881e20bf380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff8881e20bf400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                           ^
 ffff8881e20bf480: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
 ffff8881e20bf500: fc fc fc fc fc fc fc fc 00 00 00 00 00 00 00 00
==================================================================