[PATCH 5.15 114/148] net: sched: fix possible refcount leak in tc_new_tfilter()

Greg Kroah-Hartman
2022-09-26T11:27:18Z

From: Hangyu Hua <hbh25y@gmail.com>

[ Upstream commit c2e1cfefcac35e0eea229e148c8284088ce437b5 ]

tfilter_put need to be called to put the refount got by tp->ops->get to
avoid possible refcount leak when chain->tmplt_ops != NULL and
chain->tmplt_ops != tp->ops.

Fixes: 7d5509fa0d3d ("net: sched: extend proto ops with 'put' callback")
Signed-off-by: Hangyu Hua <hbh25y@gmail.com>
Reviewed-by: Vlad Buslov <vladbu@nvidia.com>
Link: https://lore.kernel.org/r/20220921092734.31700-1-hbh25y@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
net/sched/cls_api.c | 1 +
1 file changed, 1 insertion(+)

diff --git a/net/sched/cls_api.c b/net/sched/cls_api.c
index 4b552c10e7b9..62ce6981942b 100644
--- a/net/sched/cls_api.c
+++ b/net/sched/cls_api.c
@@ -2117,6 +2117,7 @@ static int tc_new_tfilter(struct sk_buff *skb, struct nlmsghdr *n,
}

if (chain->tmplt_ops && chain->tmplt_ops != tp->ops) {
+ tfilter_put(tp, fh);
NL_SET_ERR_MSG(extack, "Chain template is set to a different filter kind");
err = -EINVAL;
goto errout;
--
2.35.1