[PATCH 4.19 184/213] netfilter: nf_tables: bogus EBUSY when deleting flowtable after flush (for 4.19)

[Greg Kroah-Hartman <gregkh@linuxfoundation.org>]

4.19-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Pablo Neira Ayuso <pablo@netfilter.org>

3f0465a9ef02 ("netfilter: nf_tables: dynamically allocate hooks per
net_device in flowtables") reworks flowtable support to allow for
dynamic allocation of hooks, which implicitly fixes the following
bogus EBUSY in transaction:

  delete flowtable
  add flowtable # same flowtable with same devices, it hits EBUSY

This patch does not exist in any tree, but it fixes this issue for
-stable Linux kernel 4.19

Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 net/netfilter/nf_tables_api.c |    3 +++
 1 file changed, 3 insertions(+)

--- a/net/netfilter/nf_tables_api.c
+++ b/net/netfilter/nf_tables_api.c
@@ -5956,6 +5956,9 @@ static int nf_tables_newflowtable(struct
 			continue;
 
 		list_for_each_entry(ft, &table->flowtables, list) {
+			if (!nft_is_active_next(net, ft))
+				continue;
+
 			for (k = 0; k < ft->ops_len; k++) {
 				if (!ft->ops[k].dev)
 					continue;