netfilter: nf_tables: don't write table validation state without mutex

Bugzilla: https://bugzilla.redhat.com/show_bug.cgi?id=2189550
Upstream Status: commit 9a32e98

commit 9a32e98
Author: Florian Westphal <fw@strlen.de>
Date:   Thu Apr 13 17:13:19 2023 +0200

    netfilter: nf_tables: don't write table validation state without mutex

    The ->cleanup callback needs to be removed, this doesn't work anymore as
    the transaction mutex is already released in the ->abort function.

    Just do it after a successful validation pass, this either happens
    from commit or abort phases where transaction mutex is held.

    Fixes: f102d66 ("netfilter: nf_tables: use dedicated mutex to guard transactions")
    Signed-off-by: Florian Westphal <fw@strlen.de>
    Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

Signed-off-by: Florian Westphal <fwestpha@redhat.com>

Author: fw-strlen

include/linux/netfilter/nfnetlink.h

@@ -45,7 +45,6 @@ struct nfnetlink_subsystem {
 	int (*commit)(struct net *net, struct sk_buff *skb);
 	int (*abort)(struct net *net, struct sk_buff *skb,
 		     enum nfnl_abort_action action);
-	void (*cleanup)(struct net *net);
 	bool (*valid_genid)(struct net *net, u32 genid);
 };
 

net/netfilter/nf_tables_api.c

@@ -8383,6 +8383,8 @@ static int nf_tables_validate(struct net *net)
 			if (nft_table_validate(net, table) < 0)
 				return -EAGAIN;
 		}
+
+		nft_validate_state_update(net, NFT_VALIDATE_SKIP);
 		break;
 	}
 
@@ -9254,11 +9256,6 @@ static int __nf_tables_abort(struct net *net, enum nfnl_abort_action action)
 	return 0;
 }
 
-static void nf_tables_cleanup(struct net *net)
-{
-	nft_validate_state_update(net, NFT_VALIDATE_SKIP);
-}
-
 static int nf_tables_abort(struct net *net, struct sk_buff *skb,
 			   enum nfnl_abort_action action)
 {
@@ -9292,7 +9289,6 @@ static const struct nfnetlink_subsystem nf_tables_subsys = {
 	.cb		= nf_tables_cb,
 	.commit		= nf_tables_commit,
 	.abort		= nf_tables_abort,
-	.cleanup	= nf_tables_cleanup,
 	.valid_genid	= nf_tables_valid_genid,
 	.owner		= THIS_MODULE,
 };

net/netfilter/nfnetlink.c

@@ -590,8 +590,6 @@ static void nfnetlink_rcv_batch(struct sk_buff *skb, struct nlmsghdr *nlh,
 			goto replay_abort;
 		}
 	}
-	if (ss->cleanup)
-		ss->cleanup(net);
 
 	nfnl_err_deliver(&err_list, oskb);
 	kfree_skb(skb);