Patch "net_sched: reorder pernet ops and act ops registrations" has been added to the 4.8-stable tree

This is a note to let you know that I've just added the patch titled

    net_sched: reorder pernet ops and act ops registrations

to the 4.8-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     net_sched-reorder-pernet-ops-and-act-ops-registrations.patch
and it can be found in the queue-4.8 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let [off-list ref] know about it.

From foo@baz Thu Nov 10 16:43:03 CET 2016

From: WANG Cong <redacted>
Date: Tue, 11 Oct 2016 10:56:45 -0700
Subject: net_sched: reorder pernet ops and act ops registrations

From: WANG Cong <redacted>


[ Upstream commit ab102b80cef28c20b3ef7794806c3a982c6444fc ]

Krister reported a kernel NULL pointer dereference after
tcf_action_init_1() invokes a_o->init(), it is a race condition
where one thread calling tcf_register_action() to initialize
the netns data after putting act ops in the global list and
the other thread searching the list and then calling
a_o->init(net, ...).

Fix this by moving the pernet ops registration before making
the action ops visible. This is fine because: a) we don't
rely on act_base in pernet ops->init(), b) in the worst case we
have a fully initialized netns but ops is still not ready so
new actions still can't be created.

Reported-by: Krister Johansen <redacted>
Tested-by: Krister Johansen <redacted>
Cc: Jamal Hadi Salim <jhs@mojatatu.com>
Signed-off-by: Cong Wang <redacted>
Acked-by: Jamal Hadi Salim <jhs@mojatatu.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 net/sched/act_api.c |   19 +++++++++++--------
 1 file changed, 11 insertions(+), 8 deletions(-)

--- a/net/sched/act_api.c
+++ b/net/sched/act_api.c

@@ -341,22 +341,25 @@ int tcf_register_action(struct tc_action
 	if (!act->act || !act->dump || !act->init || !act->walk || !act->lookup)
 		return -EINVAL;
 
+	/* We have to register pernet ops before making the action ops visible,
+	 * otherwise tcf_action_init_1() could get a partially initialized
+	 * netns.
+	 */
+	ret = register_pernet_subsys(ops);
+	if (ret)
+		return ret;
+
 	write_lock(&act_mod_lock);
 	list_for_each_entry(a, &act_base, head) {
 		if (act->type == a->type || (strcmp(act->kind, a->kind) == 0)) {
 			write_unlock(&act_mod_lock);
+			unregister_pernet_subsys(ops);
 			return -EEXIST;
 		}
 	}
 	list_add_tail(&act->head, &act_base);
 	write_unlock(&act_mod_lock);
 
-	ret = register_pernet_subsys(ops);
-	if (ret) {
-		tcf_unregister_action(act, ops);
-		return ret;
-	}
-
 	return 0;
 }
 EXPORT_SYMBOL(tcf_register_action);

@@ -367,8 +370,6 @@ int tcf_unregister_action(struct tc_acti
 	struct tc_action_ops *a;
 	int err = -ENOENT;
 
-	unregister_pernet_subsys(ops);
-
 	write_lock(&act_mod_lock);
 	list_for_each_entry(a, &act_base, head) {
 		if (a == act) {

@@ -378,6 +379,8 @@ int tcf_unregister_action(struct tc_acti
 		}
 	}
 	write_unlock(&act_mod_lock);
+	if (!err)
+		unregister_pernet_subsys(ops);
 	return err;
 }
 EXPORT_SYMBOL(tcf_unregister_action);

Patches currently in stable-queue which might be from xiyou.wangcong@gmail.com are

queue-4.8/net_sched-reorder-pernet-ops-and-act-ops-registrations.patch
queue-4.8/net-sched-filters-fix-notification-of-filter-delete-with-proper-handle.patch
queue-4.8/ipv4-use-the-right-lock-for-ping_group_range.patch