netfilter: nftables: skip hook overlap logic if flowtable is stale

If the flowtable has been previously removed in this batch, skip the
hook overlap checks. This fixes spurious EEXIST errors when removing and
adding the flowtable in the same batch.

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 4fcd07f1e925f934603ff5b2ca110a761dbe2f8e..f57f1a6ba96f6c6479ffa696ecd89d277223302f 100644 (file)
--- a/net/netfilter/nf_tables_api.c
+++ b/net/netfilter/nf_tables_api.c
@@ -6783,6 +6783,9 @@ static int nft_register_flowtable_net_hooks(struct net *net,
 
        list_for_each_entry(hook, hook_list, list) {
                list_for_each_entry(ft, &table->flowtables, list) {
+                       if (!nft_is_active_next(net, ft))
+                               continue;
+
                        list_for_each_entry(hook2, &ft->hook_list, list) {
                                if (hook->ops.dev == hook2->ops.dev &&
                                    hook->ops.pf == hook2->ops.pf) {