[PATCH -stable,4.19.x 26/40] netfilter: nf_tables: bogus EBUSY when deleting flowtable after flush (for 4.19)

Pablo Neira Ayuso
2024-06-13T01:02:35Z

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>
---
net/netfilter/nf_tables_api.c | 3 +++
1 file changed, 3 insertions(+)

diff --git a/net/netfilter/nf_tables_api.c b/net/netfilter/nf_tables_api.c
index d7993ac8222d..bac994847327 100644
--- a/net/netfilter/nf_tables_api.c
+++ b/net/netfilter/nf_tables_api.c
@@ -5956,6 +5956,9 @@ static int nf_tables_newflowtable(struct net *net, struct sock *nlsk,
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;
--
2.30.2