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netfilter: nf_tables: don't assume chain stats are set when jumplabel is set

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nft_chain_stats_replace() and all other spots assume ->stats can be
NULL, but nft_update_chain_stats does not.  It must do this check,
just because the jump label is set doesn't mean all basechains have stats
assigned.

Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
Florian Westphal 2018-05-06 00:47:20 +02:00 committed by Pablo Neira Ayuso
parent a44f6d82a4
commit 009240940e
1 changed files with 14 additions and 7 deletions
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21
net/netfilter/nf_tables_core.c
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@ -119,15 +119,22 @@ DEFINE_STATIC_KEY_FALSE(nft_counters_enabled);
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 *stats;
local_bh_disable();
stats = this_cpu_ptr(rcu_dereference(nft_base_chain(chain)->stats));
u64_stats_update_begin(&stats->syncp);
stats->pkts++;
stats->bytes += pkt->skb->len;
u64_stats_update_end(&stats->syncp);
local_bh_enable();
base_chain = nft_base_chain(chain);
if (!base_chain->stats)
return;
stats = this_cpu_ptr(rcu_dereference(base_chain->stats));
if (stats) {
local_bh_disable();
u64_stats_update_begin(&stats->syncp);
stats->pkts++;
stats->bytes += pkt->skb->len;
u64_stats_update_end(&stats->syncp);
local_bh_enable();
}
}
struct nft_jumpstack {