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

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 7e27e8d613
("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: 7e27e8d613 ("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>
This commit is contained in:
Junwei Hu 2019-05-20 14:43:59 +08:00 committed by David S. Miller
parent f49aa1de98
commit 526f5b851a
3 changed files with 27 additions and 10 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

18
net/tipc/core.c
View File

@ -77,9 +77,6 @@ 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)
@ -88,8 +85,6 @@ 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);
@ -99,7 +94,6 @@ 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);
@ -113,6 +107,11 @@ 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;
@ -143,6 +142,10 @@ 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;
@ -150,6 +153,8 @@ 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);
@ -167,6 +172,7 @@ 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();

5
net/tipc/subscr.h
View File

@ -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);

14
net/tipc/topsrv.c
View File

@ -635,7 +635,7 @@ 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";
@ -668,7 +668,7 @@ 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;
@ -693,3 +693,13 @@ 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);
}