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netfilter: nf_tables: return immediately on empty commit 

When running 'nft flush ruleset' while no rules exist, we will increment
the generation counter and announce a new genid to userspace, yet
nothing had changed in the first place.

Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
Florian Westphal 2019-03-07 23:20:11 +01:00 committed by Pablo Neira Ayuso
parent 3f3a390dbd
commit b8b2749865
1 changed files with 5 additions and 0 deletions
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5
net/netfilter/nf_tables_api.c
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@ -6564,6 +6564,11 @@ static int nf_tables_commit(struct net *net, struct sk_buff *skb)
struct nft_chain *chain;
struct nft_table *table;
if (list_empty(&net->nft.commit_list)) {
mutex_unlock(&net->nft.commit_mutex);
return 0;
}
/* 0. Validate ruleset, otherwise roll back for error reporting. */
if (nf_tables_validate(net) < 0)
return -EAGAIN;