netfilter: flowtable_offload: fix using __this_cpu_add in preemptible

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

netfilter: flowtable_offload: fix using __this_cpu_add in preemptible

flow_offload_queue_work() can be called in workqueue without

bh disabled, like the call trace showed in my act_ct testing,

calling NF_FLOW_TABLE_STAT_INC() there would cause a call

trace:

BUG: using __this_cpu_add() in preemptible [00000000] code: kworker/u4:0/138560

caller is flow_offload_queue_work+0xec/0x1b0 [nf_flow_table]

Workqueue: act_ct_workqueue tcf_ct_flow_table_cleanup_work [act_ct]

Call Trace:

<TASK>

dump_stack_lvl+0x33/0x46

check_preemption_disabled+0xc3/0xf0

flow_offload_queue_work+0xec/0x1b0 [nf_flow_table]

nf_flow_table_iterate+0x138/0x170 [nf_flow_table]

nf_flow_table_free+0x140/0x1a0 [nf_flow_table]

tcf_ct_flow_table_cleanup_work+0x2f/0x2b0 [act_ct]

process_one_work+0x6a3/0x1030

worker_thread+0x8a/0xdf0

This patch fixes it by using NF_FLOW_TABLE_STAT_INC_ATOMIC()

instead in flow_offload_queue_work().

Note that for FLOW_CLS_REPLACE branch in flow_offload_queue_work(),

it may not be called in preemptible path, but it's good to use

NF_FLOW_TABLE_STAT_INC_ATOMIC() for all cases in

flow_offload_queue_work().