[PATCH 5/5] netfilter: nf_tables: return immediately on empty commit

[Pablo Neira Ayuso <pablo@netfilter.org>]

From: Florian Westphal <fw@strlen.de>

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>
---
 net/netfilter/nf_tables_api.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/net/netfilter/nf_tables_api.c b/net/netfilter/nf_tables_api.c
index 9d8f51dfc593..513f93118604 100644
--- a/net/netfilter/nf_tables_api.c
+++ b/net/netfilter/nf_tables_api.c
@@ -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;
-- 
2.11.0