netfilter: nf_tables: prohibit deletion of a table with existing sets

We currently leak the set memory when deleting a table that still has
sets in it. Return EBUSY when attempting to delete a table with sets.

Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

diff --git a/net/netfilter/nf_tables_api.c b/net/netfilter/nf_tables_api.c
index c352614..36add31 100644 (file)
--- a/net/netfilter/nf_tables_api.c
+++ b/net/netfilter/nf_tables_api.c
@@ -467,7 +467,7 @@ static int nf_tables_deltable(struct sock *nlsk, struct sk_buff *skb,
        if (IS_ERR(table))
                return PTR_ERR(table);
 
-       if (table->use)
+       if (!list_empty(&table->chains) || !list_empty(&table->sets))
                return -EBUSY;
 
        list_del(&table->list);