netfilter: nf_tables: skip bound chain on rule flush

JIRA: https://issues.redhat.com/browse/RHEL-1720
JIRA: https://issues.redhat.com/browse/RHEL-1721
Upstream Status: commit 6eaf41e

commit 6eaf41e
Author: Pablo Neira Ayuso <pablo@netfilter.org>
Date:   Thu Jul 20 09:17:21 2023 +0200

    netfilter: nf_tables: skip bound chain on rule flush

    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: d0e2c7d ("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: Florian Westphal <fwestpha@redhat.com>

Author: fw-strlen

net/netfilter/nf_tables_api.c

@@ -3836,6 +3836,8 @@ 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);