tipc: use bc_lock to protect node map in bearer structure

The node map variable - 'nodes' in bearer structure is only used by
bclink. When bclink accesses it, bc_lock is held. But when change it,
for instance, in tipc_bearer_add_dest() or tipc_bearer_remove_dest()
the bc_lock is not taken at all. To avoid any inconsistent data, we
should always grab bc_lock while accessing node map variable.

Signed-off-by: Ying Xue <ying.xue@windriver.com>
Reviewed-by: Jon Maloy <jon.maloy@ericsson.com>
Reviewed-by: Erik Hugne <erik.hugne@ericsson.com>
Tested-by: Erik Hugne <erik.hugne@ericsson.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 2 insertions, 4 deletions

diff --git a/net/tipc/bearer.c b/net/tipc/bearer.c
index 44fd22a0c070..3abd9702b887 100644
--- a/net/tipc/bearer.c
+++ b/net/tipc/bearer.c
@@ -220,8 +220,7 @@ void tipc_bearer_add_dest(u32 bearer_id, u32 dest)
 	rcu_read_lock();
 	b_ptr = rcu_dereference_rtnl(bearer_list[bearer_id]);
 	if (b_ptr) {
-		tipc_nmap_add(&b_ptr->nodes, dest);
-		tipc_bcbearer_sort();
+		tipc_bcbearer_sort(&b_ptr->nodes, dest, true);
 		tipc_disc_add_dest(b_ptr->link_req);
 	}
 	rcu_read_unlock();
@@ -234,8 +233,7 @@ void tipc_bearer_remove_dest(u32 bearer_id, u32 dest)
 	rcu_read_lock();
 	b_ptr = rcu_dereference_rtnl(bearer_list[bearer_id]);
 	if (b_ptr) {
-		tipc_nmap_remove(&b_ptr->nodes, dest);
-		tipc_bcbearer_sort();
+		tipc_bcbearer_sort(&b_ptr->nodes, dest, false);
 		tipc_disc_remove_dest(b_ptr->link_req);
 	}
 	rcu_read_unlock();