[PATCH net v2] net: sched: act_ct: fix possible refcount leak in tcf_ct_init()

Hangyu Hua
2022-09-23T02:01:12Z

nf_ct_put need to be called to put the refcount got by tcf_ct_fill_params
to avoid possible refcount leak when tcf_ct_flow_table_get fails.

Fixes: c34b961a2492 ("net/sched: act_ct: Create nf flow table per zone")
Signed-off-by: Hangyu Hua <hbh25y@gmail.com>
---

v2: use a new label to put the refcount.

net/sched/act_ct.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/net/sched/act_ct.c b/net/sched/act_ct.c
index d55afb8d14be..5950974ae8f6 100644
--- a/net/sched/act_ct.c
+++ b/net/sched/act_ct.c
@@ -1394,7 +1394,7 @@ static int tcf_ct_init(struct net *net, struct nlattr *nla,

err = tcf_ct_flow_table_get(net, params);
if (err)
- goto cleanup;
+ goto cleanup_params;

spin_lock_bh(&c->tcf_lock);
goto_ch = tcf_action_set_ctrlact(*a, parm->action, goto_ch);
@@ -1409,6 +1409,9 @@ static int tcf_ct_init(struct net *net, struct nlattr *nla,

return res;

+cleanup_params:
+ if (params->tmpl)
+ nf_ct_put(params->tmpl);
cleanup:
if (goto_ch)
tcf_chain_put_by_act(goto_ch);
--
2.34.1