tipc: fix modprobe tipc failed after switch order of device registration

commit 526f5b851a96566803ee4bee60d0a34df56c77f8 upstream.

Error message printed:
modprobe: ERROR: could not insert 'tipc': Address family not
supported by protocol.
when modprobe tipc after the following patch: switch order of
device registration, commit 7e27e8d6130c
("tipc: switch order of device registration to fix a crash")

Because sock_create_kern(net, AF_TIPC, ...) called by
tipc_topsrv_create_listener() in the initialization process
of tipc_init_net(), so tipc_socket_init() must be execute before that.
Meanwhile, tipc_net_id need to be initialized when sock_create()
called, and tipc_socket_init() is no need to be called for each namespace.

I add a variable tipc_topsrv_net_ops, and split the
register_pernet_subsys() of tipc into two parts, and split
tipc_socket_init() with initialization of pernet params.

By the way, I fixed resources rollback error when tipc_bcast_init()
failed in tipc_init_net().

Fixes: 7e27e8d6130c ("tipc: switch order of device registration to fix a crash")
Signed-off-by: Junwei Hu <hujunwei4@huawei.com>
Reported-by: Wang Wang <wangwang2@huawei.com>
Reported-by: syzbot+1e8114b61079bfe9cbc5@syzkaller.appspotmail.com
Reviewed-by: Kang Zhou <zhoukang7@huawei.com>
Reviewed-by: Suanming Mou <mousuanming@huawei.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/net/tipc/core.c b/net/tipc/core.c
index bf77321..816c125 100644 (file)
--- a/net/tipc/core.c
+++ b/net/tipc/core.c
@@ -71,9 +71,6 @@ static int __net_init tipc_init_net(struct net *net)
                goto out_nametbl;
 
        INIT_LIST_HEAD(&tn->dist_queue);
-       err = tipc_topsrv_start(net);
-       if (err)
-               goto out_subscr;
 
        err = tipc_bcast_init(net);
        if (err)
@@ -82,8 +79,6 @@ static int __net_init tipc_init_net(struct net *net)
        return 0;
 
 out_bclink:
-       tipc_bcast_stop(net);
-out_subscr:
        tipc_nametbl_stop(net);
 out_nametbl:
        tipc_sk_rht_destroy(net);
@@ -93,7 +88,6 @@ out_sk_rht:
 
 static void __net_exit tipc_exit_net(struct net *net)
 {
-       tipc_topsrv_stop(net);
        tipc_net_stop(net);
        tipc_bcast_stop(net);
        tipc_nametbl_stop(net);
@@ -107,6 +101,11 @@ static struct pernet_operations tipc_net_ops = {
        .size = sizeof(struct tipc_net),
 };
 
+static struct pernet_operations tipc_topsrv_net_ops = {
+       .init = tipc_topsrv_init_net,
+       .exit = tipc_topsrv_exit_net,
+};
+
 static int __init tipc_init(void)
 {
        int err;
@@ -137,6 +136,10 @@ static int __init tipc_init(void)
        if (err)
                goto out_socket;
 
+       err = register_pernet_subsys(&tipc_topsrv_net_ops);
+       if (err)
+               goto out_pernet_topsrv;
+
        err = tipc_bearer_setup();
        if (err)
                goto out_bearer;
@@ -144,6 +147,8 @@ static int __init tipc_init(void)
        pr_info("Started in single node mode\n");
        return 0;
 out_bearer:
+       unregister_pernet_subsys(&tipc_topsrv_net_ops);
+out_pernet_topsrv:
        tipc_socket_stop();
 out_socket:
        unregister_pernet_subsys(&tipc_net_ops);
@@ -161,6 +166,7 @@ out_netlink:
 static void __exit tipc_exit(void)
 {
        tipc_bearer_cleanup();
+       unregister_pernet_subsys(&tipc_topsrv_net_ops);
        tipc_socket_stop();
        unregister_pernet_subsys(&tipc_net_ops);
        tipc_netlink_stop();

diff --git a/net/tipc/subscr.c b/net/tipc/subscr.c
index d62affe..5e6dc72 100644 (file)
--- a/net/tipc/subscr.c
+++ b/net/tipc/subscr.c
@@ -358,7 +358,7 @@ static void *tipc_subscrb_connect_cb(int conid)
        return (void *)tipc_subscrb_create(conid);
 }
 
-int tipc_topsrv_start(struct net *net)
+static int tipc_topsrv_start(struct net *net)
 {
        struct tipc_net *tn = net_generic(net, tipc_net_id);
        const char name[] = "topology_server";
@@ -396,7 +396,7 @@ int tipc_topsrv_start(struct net *net)
        return tipc_server_start(topsrv);
 }
 
-void tipc_topsrv_stop(struct net *net)
+static void tipc_topsrv_stop(struct net *net)
 {
        struct tipc_net *tn = net_generic(net, tipc_net_id);
        struct tipc_server *topsrv = tn->topsrv;
@@ -405,3 +405,13 @@ void tipc_topsrv_stop(struct net *net)
        kfree(topsrv->saddr);
        kfree(topsrv);
 }
+
+int __net_init tipc_topsrv_init_net(struct net *net)
+{
+       return tipc_topsrv_start(net);
+}
+
+void __net_exit tipc_topsrv_exit_net(struct net *net)
+{
+       tipc_topsrv_stop(net);
+}

diff --git a/net/tipc/subscr.h b/net/tipc/subscr.h
index ffdc214..814dfce 100644 (file)
--- a/net/tipc/subscr.h
+++ b/net/tipc/subscr.h
@@ -75,7 +75,8 @@ void tipc_subscrp_report_overlap(struct tipc_subscription *sub,
 void tipc_subscrp_convert_seq(struct tipc_name_seq *in, int swap,
                              struct tipc_name_seq *out);
 u32 tipc_subscrp_convert_seq_type(u32 type, int swap);
-int tipc_topsrv_start(struct net *net);
-void tipc_topsrv_stop(struct net *net);
+
+int __net_init tipc_topsrv_init_net(struct net *net);
+void __net_exit tipc_topsrv_exit_net(struct net *net);
 
 #endif