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net: sched: act_ife: always release ife action on init error

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Action init API was changed to always take reference to action, even when
overwriting existing action. Substitute conditional action release, which
was executed only if action is newly created, with unconditional release in
tcf_ife_init() error handling code to prevent double free or memory leak in
case of overwrite.

Fixes: 4e8ddd7f17 ("net: sched: don't release reference on action overwrite")
Reported-by: Cong Wang <xiyou.wangcong@gmail.com>
Signed-off-by: Vlad Buslov <vladbu@mellanox.com>
Acked-by: Cong Wang <xiyou.wangcong@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Vlad Buslov 2018-08-14 20:29:56 +03:00 • committed by David S. Miller
parent 5f34f69ede
commit 32039eac4c
1 changed files with 2 additions and 6 deletions
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8
net/sched/act_ife.c
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@ -551,9 +551,6 @@ static int tcf_ife_init(struct net *net, struct nlattr *nla,
NULL, NULL);
if (err) {
metadata_parse_err:
if (ret == ACT_P_CREATED)
tcf_idr_release(*a, bind);
if (exists)
spin_unlock_bh(&ife->tcf_lock);
tcf_idr_release(*a, bind);
@ -574,11 +571,10 @@ metadata_parse_err:
*/
err = use_all_metadata(ife);
if (err) {
if (ret == ACT_P_CREATED)
tcf_idr_release(*a, bind);
if (exists)
spin_unlock_bh(&ife->tcf_lock);
tcf_idr_release(*a, bind);
kfree(p);
return err;
}