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authorCong Wang <xiyou.wangcong@gmail.com>2018-09-03 11:08:15 -0700
committerDavid S. Miller <davem@davemloft.net>2018-09-04 12:18:25 -0700
commit6d784f1625ea68783cc1fb17de8f6cd3e1660c3f (patch)
treeb5522e1f480bd5166de5844f71e51c2eaecdca48 /net/sched
parent639505d4397b8c654a8e2616f9cb70ece40c83f9 (diff)
act_ife: fix a potential use-after-free
Immediately after module_put(), user could delete this module, so e->ops could be already freed before we call e->ops->release(). Fix this by moving module_put() after ops->release(). Fixes: ef6980b6becb ("introduce IFE action") Cc: Jamal Hadi Salim <jhs@mojatatu.com> Signed-off-by: Cong Wang <xiyou.wangcong@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/sched')
-rw-r--r--net/sched/act_ife.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/net/sched/act_ife.c b/net/sched/act_ife.c
index 196430aefe87..fc412769a1be 100644
--- a/net/sched/act_ife.c
+++ b/net/sched/act_ife.c
@@ -400,7 +400,6 @@ static void _tcf_ife_cleanup(struct tc_action *a)
struct tcf_meta_info *e, *n;
list_for_each_entry_safe(e, n, &ife->metalist, metalist) {
- module_put(e->ops->owner);
list_del(&e->metalist);
if (e->metaval) {
if (e->ops->release)
@@ -408,6 +407,7 @@ static void _tcf_ife_cleanup(struct tc_action *a)
else
kfree(e->metaval);
}
+ module_put(e->ops->owner);
kfree(e);
}
}