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Commit ca75a9fc authored by Junwei Hu's avatar Junwei Hu Committed by Greg Kroah-Hartman
Browse files

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: default avatarJunwei Hu <hujunwei4@huawei.com>
Reported-by: default avatarWang Wang <wangwang2@huawei.com>
Reported-by: default avatar <syzbot+1e8114b61079bfe9cbc5@syzkaller.appspotmail.com>
Reviewed-by: default avatarKang Zhou <zhoukang7@huawei.com>
Reviewed-by: default avatarSuanming Mou <mousuanming@huawei.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent ab69a230

net/tipc/core.c

+12 −6
Original line number Diff line number Diff line
@@ -75,9 +75,6 @@ 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)
@@ -86,8 +83,6 @@ 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);
@@ -97,7 +92,6 @@ static int __net_init tipc_init_net(struct net *net) 


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);
@@ -111,6 +105,11 @@ 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;
@@ -141,6 +140,10 @@ 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;
@@ -148,6 +151,8 @@ 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);
@@ -165,6 +170,7 @@ static int __init tipc_init(void) 
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();

net/tipc/subscr.h

+3 −2
Original line number Diff line number Diff line
@@ -77,8 +77,9 @@ void tipc_sub_report_overlap(struct tipc_subscription *sub, 
			     u32 found_lower, u32 found_upper,

			     u32 event, u32 port, u32 node,

			     u32 scope, int must);

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);



void tipc_sub_put(struct tipc_subscription *subscription);

void tipc_sub_get(struct tipc_subscription *subscription);

net/tipc/topsrv.c

+12 −2
Original line number Diff line number Diff line
@@ -643,7 +643,7 @@ static void tipc_topsrv_work_stop(struct tipc_topsrv *s) 
	destroy_workqueue(s->send_wq);

}



int tipc_topsrv_start(struct net *net)

static int tipc_topsrv_start(struct net *net)

{

	struct tipc_net *tn = tipc_net(net);

	const char name[] = "topology_server";
@@ -677,7 +677,7 @@ int tipc_topsrv_start(struct net *net) 
	return ret;

}



void tipc_topsrv_stop(struct net *net)

static void tipc_topsrv_stop(struct net *net)

{

	struct tipc_topsrv *srv = tipc_topsrv(net);

	struct socket *lsock = srv->listener;
@@ -702,3 +702,13 @@ void tipc_topsrv_stop(struct net *net) 
	idr_destroy(&srv->conn_idr);

	kfree(srv);

}



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);

}