netfilter: nf_tables: skip bound chain on rule flush

[ Upstream commit 6eaf41e87a223ae6f8e7a28d6e78384ad7e407f8 ]

Skip bound chain when flushing table rules, the rule that owns this
chain releases these objects.

Otherwise, the following warning is triggered:

  WARNING: CPU: 2 PID: 1217 at net/netfilter/nf_tables_api.c:2013 nf_tables_chain_destroy+0x1f7/0x210 [nf_tables]
  CPU: 2 PID: 1217 Comm: chain-flush Not tainted 6.1.39 #1
  RIP: 0010:nf_tables_chain_destroy+0x1f7/0x210 [nf_tables]

Fixes: d0e2c7de92c7 ("netfilter: nf_tables: add NFT_CHAIN_BINDING")
Reported-by: Kevin Rich <kevinrich1337@gmail.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/net/netfilter/nf_tables_api.c b/net/netfilter/nf_tables_api.c
index f621c5e48747be4f1e9a79b7ea06476b96d1850e..ecde497368ec4e2d5c4047e1ffd2e923f448cabc 100644 (file)
--- a/net/netfilter/nf_tables_api.c
+++ b/net/netfilter/nf_tables_api.c
@@ -3892,6 +3892,8 @@ static int nf_tables_delrule(struct sk_buff *skb, const struct nfnl_info *info,
                list_for_each_entry(chain, &table->chains, list) {
                        if (!nft_is_active_next(net, chain))
                                continue;
+                       if (nft_chain_is_bound(chain))
+                               continue;
 
                        ctx.chain = chain;
                        err = nft_delrule_by_chain(&ctx);