[PATCH][v2] netfilter: check the result of dereferencing base_chain->stats

[Li RongQing]

check the result of dereferencing base_chain->stats, instead of
result of this_cpu_ptr with NULL

base_chain->stats maybe be changed to NULL when a chain is
updated and a new NULL counter can be attached

and we do not need to check returning of this_cpu_ptr since
base_chain->stats is from percpu allocator if it is non-NULL,
this_cpu_ptr returns a valid value

and fix two sparse error by replacing rcu_access_pointer and
rcu_dereference with READ_ONCE under rcu_read_lock

Thanks for Eric's help to finish this patch

Fixes: 009240940e84c1 ("netfilter: nf_tables: don't assume chain stats are set 
when jumplabel is set")
Signed-off-by: Eric Dumazet <eric.duma...@gmail.com>
Signed-off-by: Zhang Yu <zhangy...@baidu.com>
Signed-off-by: Li RongQing <lirongq...@baidu.com>
---
 v1 -->v2: move the dereferencing under bh disable context, and fix two sparse

 net/netfilter/nf_tables_core.c | 14 ++++++++------
 1 file changed, 8 insertions(+), 6 deletions(-)

diff --git a/net/netfilter/nf_tables_core.c b/net/netfilter/nf_tables_core.c
index 2a00aef7b6d4..7dfbc6746846 100644
--- a/net/netfilter/nf_tables_core.c
+++ b/net/netfilter/nf_tables_core.c
@@ -98,21 +98,23 @@ static noinline void nft_update_chain_stats(const struct 
nft_chain *chain,
                                            const struct nft_pktinfo *pkt)
 {
        struct nft_base_chain *base_chain;
+       struct nft_stats __percpu *pstats;
        struct nft_stats *stats;
 
        base_chain = nft_base_chain(chain);
-       if (!rcu_access_pointer(base_chain->stats))
-               return;
 
-       local_bh_disable();
-       stats = this_cpu_ptr(rcu_dereference(base_chain->stats));
-       if (stats) {
+       rcu_read_lock();
+       pstats = READ_ONCE(base_chain->stats);
+       if (pstats) {
+               local_bh_disable();
+               stats = this_cpu_ptr(pstats);
                u64_stats_update_begin(&stats->syncp);
                stats->pkts++;
                stats->bytes += pkt->skb->len;
                u64_stats_update_end(&stats->syncp);
+               local_bh_enable();
        }
-       local_bh_enable();
+       rcu_read_unlock();
 }
 
 struct nft_jumpstack {
-- 
2.16.2