Re: [syzbot] [netfilter?] KASAN: slab-use-after-free Read in nf_tables_trans_destroy_work

[Hillf Danton]

#syz test https://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next.git  1c5fc27bc48a

--- x/net/netfilter/nf_tables_api.c
+++ y/net/netfilter/nf_tables_api.c
@@ -11552,9 +11552,10 @@ static int nft_rcv_nl_event(struct notif
 
 	gc_seq = nft_gc_seq_begin(nft_net);
 
-	if (!list_empty(&nf_tables_destroy_list))
-		nf_tables_trans_destroy_flush_work();
+	nf_tables_trans_destroy_flush_work();
 again:
+	WARN_ON(!list_empty(&nft_net->commit_list) || !list_empty(&nf_tables_destroy_list));
+
 	list_for_each_entry(table, &nft_net->tables, list) {
 		if (nft_table_has_owner(table) &&
 		    n->portid == table->nlpid) {
--