From: Hangyu Hua <hbh25y@gmail.com>
Date: Wed, 21 Sep 2022 09:27:34 +0000 (+0800)
Subject: net: sched: fix possible refcount leak in tc_new_tfilter()
X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=c2e1cfefcac35e0eea229e148c8284088ce437b5;p=linux.git

net: sched: fix possible refcount leak in tc_new_tfilter()

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>
---

diff --git a/net/sched/cls_api.c b/net/sched/cls_api.c
index 790d6809be813..51d175f3fbcb5 100644
--- a/net/sched/cls_api.c
+++ b/net/sched/cls_api.c
@@ -2137,6 +2137,7 @@ replay:
 	}
 
 	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;