From: Junwei Hu hujunwei4@huawei.com
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
--- net/tipc/core.c | 18 ++++++++++++------ net/tipc/subscr.c | 14 ++++++++++++-- net/tipc/subscr.h | 5 +++-- 3 files changed, 27 insertions(+), 10 deletions(-)
--- a/net/tipc/core.c +++ b/net/tipc/core.c @@ -70,9 +70,6 @@ static int __net_init tipc_init_net(stru 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) @@ -81,8 +78,6 @@ static int __net_init tipc_init_net(stru return 0;
out_bclink: - tipc_bcast_stop(net); -out_subscr: tipc_nametbl_stop(net); out_nametbl: tipc_sk_rht_destroy(net); @@ -92,7 +87,6 @@ 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); @@ -106,6 +100,11 @@ static struct pernet_operations tipc_net .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; @@ -138,6 +137,10 @@ 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; @@ -145,6 +148,8 @@ 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); @@ -162,6 +167,7 @@ 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(); --- a/net/tipc/subscr.c +++ b/net/tipc/subscr.c @@ -306,7 +306,7 @@ static void *tipc_subscrb_connect_cb(int 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"; @@ -344,7 +344,7 @@ 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; @@ -353,3 +353,13 @@ 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); +} --- a/net/tipc/subscr.h +++ b/net/tipc/subscr.h @@ -77,7 +77,8 @@ int tipc_subscrp_check_overlap(struct ti void tipc_subscrp_report_overlap(struct tipc_subscription *sub, u32 found_lower, u32 found_upper, u32 event, u32 port_ref, u32 node, 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);
#endif