From 44f8baaf230c655c249467ca415b570deca8df77 Mon Sep 17 00:00:00 2001
From: Hangyu Hua <hbh25y@gmail.com>
Date: Wed, 7 Jun 2023 10:23:01 +0800
Subject: [PATCH] net: sched: fix possible refcount leak in
tc_chain_tmplt_add()
try_module_get will be called in tcf_proto_lookup_ops. So module_put needs
to be called to drop the refcount if ops don't implement the required
function.
Fixes: 9f407f1768d3 ("net: sched: introduce chain templates")
Signed-off-by: Hangyu Hua <hbh25y@gmail.com>
Reviewed-by: Larysa Zaremba <larysa.zaremba@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
---
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 b2432ee04f319..c877a6343fd47 100644
--- a/net/sched/cls_api.c
+++ b/net/sched/cls_api.c
@@ -2950,6 +2950,7 @@ static int tc_chain_tmplt_add(struct tcf_chain *chain, struct net *net,
return PTR_ERR(ops);
if (!ops->tmplt_create || !ops->tmplt_destroy || !ops->tmplt_dump) {
NL_SET_ERR_MSG(extack, "Chain templates are not supported with specified classifier");
+ module_put(ops->owner);
return -EOPNOTSUPP;
}
--
2.30.2