CVE-2021-47163

In the Linux kernel, the following vulnerability has been resolved:

tipc: wait and exit until all work queues are done

On some host, a crash could be triggered simply by repeating these

commands several times:

# modprobe tipc

# tipc bearer enable media udp name UDP1 localip 127.0.0.1

# rmmod tipc

[] BUG: unable to handle kernel paging request at ffffffffc096bb00

[] Workqueue: events 0xffffffffc096bb00

[] Call Trace:

[] ? process_one_work+0x1a7/0x360

[] ? worker_thread+0x30/0x390

[] ? create_worker+0x1a0/0x1a0

[] ? kthread+0x116/0x130

[] ? kthread_flush_work_fn+0x10/0x10

[] ? ret_from_fork+0x35/0x40

When removing the TIPC module, the UDP tunnel sock will be delayed to

release in a work queue as sock_release() can't be done in rtnl_lock().

If the work queue is schedule to run after the TIPC module is removed,

kernel will crash as the work queue function cleanup_beareri() code no

longer exists when trying to invoke it.

To fix it, this patch introduce a member wq_count in tipc_net to track

the numbers of work queues in schedule, and wait and exit until all

work queues are done in tipc_exit_net().