[PATCH 5.5 140/151] netfilter: nf_tables: free flowtable hooks on hook register error

From: Greg Kroah-Hartman
Date: Tue Mar 17 2020 - 07:14:23 EST


From: Florian Westphal <fw@xxxxxxxxx>

commit 2d285f26ecd072800a29c5b71e63437f21ef830a upstream.

If hook registration fails, the hooks allocated via nft_netdev_hook_alloc
need to be freed.

We can't change the goto label to 'goto 5' -- while it does fix the memleak
it does cause a warning splat from the netfilter core (the hooks were not
registered).

Fixes: 3f0465a9ef02 ("netfilter: nf_tables: dynamically allocate hooks per net_device in flowtables")
Reported-by: syzbot+a2ff6fa45162a5ed4dd3@xxxxxxxxxxxxxxxxxxxxxxxxx
Signed-off-by: Florian Westphal <fw@xxxxxxxxx>
Signed-off-by: Pablo Neira Ayuso <pablo@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
net/netfilter/nf_tables_api.c | 7 ++++++-
1 file changed, 6 insertions(+), 1 deletion(-)

--- a/net/netfilter/nf_tables_api.c
+++ b/net/netfilter/nf_tables_api.c
@@ -6172,8 +6172,13 @@ static int nf_tables_newflowtable(struct
goto err4;

err = nft_register_flowtable_net_hooks(ctx.net, table, flowtable);
- if (err < 0)
+ if (err < 0) {
+ list_for_each_entry_safe(hook, next, &flowtable->hook_list, list) {
+ list_del_rcu(&hook->list);
+ kfree_rcu(hook, rcu);
+ }
goto err4;
+ }

err = nft_trans_flowtable_add(&ctx, NFT_MSG_NEWFLOWTABLE, flowtable);
if (err < 0)