From 198da74a4e8d4c2b2669eebc9f85e19e80cfae5a Mon Sep 17 00:00:00 2001 From: Hangyu Hua Date: Wed, 7 Jun 2023 10:23:01 +0800 Subject: [PATCH] net: sched: fix possible refcount leak in tc_chain_tmplt_add() [ Upstream commit 44f8baaf230c655c249467ca415b570deca8df77 ] 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 Reviewed-by: Larysa Zaremba Signed-off-by: David S. Miller Signed-off-by: Sasha Levin --- 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 3e5b10bec0cf..a4cf718bdb8a 100644 --- a/net/sched/cls_api.c +++ b/net/sched/cls_api.c @@ -2732,6 +2732,7 @@ 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; }