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: d0e2c7d ("netfilter: nf_tables: add NFT_CHAIN_BINDING")
Reported-by: Kevin Rich <[email protected]>
Signed-off-by: Pablo Neira Ayuso <[email protected]>
Signed-off-by: Florian Westphal <[email protected]>
Signed-off-by: Sasha Levin <[email protected]>

Author: ummakynes

net/netfilter/nf_tables_api.c

@@ -3452,6 +3452,8 @@ static int nf_tables_delrule(struct net *net, struct sock *nlsk,
 		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);