linux-kernel - [PATCH 3.16 161/202] netfilter: nf_tables: fix flush after rule deletion in the same batch

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Message-ID: <lsq.1556377989.556690474@decadent.org.uk>
Date:   Sat, 27 Apr 2019 16:13:09 +0100
From:   Ben Hutchings <ben@...adent.org.uk>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:     akpm@...ux-foundation.org, Denis Kirjanov <kda@...ux-powerpc.org>,
        "Phil Sutter" <phil@....cc>,
        "Pablo Neira Ayuso" <pablo@...filter.org>
Subject: [PATCH 3.16 161/202] netfilter: nf_tables: fix flush after rule
 deletion in the same batch

3.16.66-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Pablo Neira Ayuso <pablo@...filter.org>

commit 23b7ca4f745f21c2b9cfcb67fdd33733b3ae7e66 upstream.

Flush after rule deletion bogusly hits -ENOENT. Skip rules that have
been already from nft_delrule_by_chain() which is always called from the
flush path.

Fixes: cf9dc09d0949 ("netfilter: nf_tables: fix missing rules flushing per table")
Reported-by: Phil Sutter <phil@....cc>
Acked-by: Phil Sutter <phil@....cc>
Signed-off-by: Pablo Neira Ayuso <pablo@...filter.org>
[bwh: Backported to 3.16:
 - Use nft_rule_is_active_next() instead of nft_is_active_next()
 - Adjust context]
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 net/netfilter/nf_tables_api.c | 3 +++
 1 file changed, 3 insertions(+)

--- a/net/netfilter/nf_tables_api.c
+++ b/net/netfilter/nf_tables_api.c
@@ -1897,6 +1897,9 @@ static int nf_table_delrule_by_chain(str
 	int err;
 
 	list_for_each_entry(rule, &ctx->chain->rules, list) {
+		if (!nft_rule_is_active_next(ctx->net, rule))
+			continue;
+
 		err = nf_tables_delrule_one(ctx, rule);
 		if (err < 0)
 			return err;