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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>
This commit is contained in:
Ying Xue 2014-04-21 10:55:51 +08:00 committed by David S. Miller
parent 4ae88c94d3
commit 28dd94187a
3 changed files with 13 additions and 12 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

14
net/tipc/bcast.c
View File

@ -112,6 +112,8 @@ const char tipc_bclink_name[] = "broadcast-link";
static void tipc_nmap_diff(struct tipc_node_map *nm_a,
struct tipc_node_map *nm_b,
struct tipc_node_map *nm_diff);
static void tipc_nmap_add(struct tipc_node_map *nm_ptr, u32 node);
static void tipc_nmap_remove(struct tipc_node_map *nm_ptr, u32 node);
static u32 bcbuf_acks(struct sk_buff *buf)
{
@ -653,7 +655,7 @@ static int tipc_bcbearer_send(struct sk_buff *buf, struct tipc_bearer *unused1,
/**
* tipc_bcbearer_sort - create sets of bearer pairs used by broadcast bearer
*/
void tipc_bcbearer_sort(void)
void tipc_bcbearer_sort(struct tipc_node_map *nm_ptr, u32 node, bool action)
{
struct tipc_bcbearer_pair *bp_temp = bcbearer->bpairs_temp;
struct tipc_bcbearer_pair *bp_curr;
@ -663,6 +665,11 @@ void tipc_bcbearer_sort(void)
spin_lock_bh(&bc_lock);
if (action)
tipc_nmap_add(nm_ptr, node);
else
tipc_nmap_remove(nm_ptr, node);
/* Group bearers by priority (can assume max of two per priority) */
memset(bp_temp, 0, sizeof(bcbearer->bpairs_temp));
@ -801,11 +808,10 @@ void tipc_bclink_stop(void)
memset(bcbearer, 0, sizeof(*bcbearer));
}
/**
* tipc_nmap_add - add a node to a node map
*/
void tipc_nmap_add(struct tipc_node_map *nm_ptr, u32 node)
static void tipc_nmap_add(struct tipc_node_map *nm_ptr, u32 node)
{
int n = tipc_node(node);
int w = n / WSIZE;
@ -820,7 +826,7 @@ void tipc_nmap_add(struct tipc_node_map *nm_ptr, u32 node)
/**
* tipc_nmap_remove - remove a node from a node map
*/
void tipc_nmap_remove(struct tipc_node_map *nm_ptr, u32 node)
static void tipc_nmap_remove(struct tipc_node_map *nm_ptr, u32 node)
{
int n = tipc_node(node);
int w = n / WSIZE;

5
net/tipc/bcast.h
View File

@ -69,9 +69,6 @@ struct tipc_node;
extern const char tipc_bclink_name[];
void tipc_nmap_add(struct tipc_node_map *nm_ptr, u32 node);
void tipc_nmap_remove(struct tipc_node_map *nm_ptr, u32 node);
/**
* tipc_nmap_equal - test for equality of node maps
*/
@ -98,6 +95,6 @@ void tipc_bclink_update_link_state(struct tipc_node *n_ptr, u32 last_sent);
int tipc_bclink_stats(char *stats_buf, const u32 buf_size);
int tipc_bclink_reset_stats(void);
int tipc_bclink_set_queue_limits(u32 limit);
void tipc_bcbearer_sort(void);
void tipc_bcbearer_sort(struct tipc_node_map *nm_ptr, u32 node, bool action);
#endif

6
net/tipc/bearer.c
View File

@ -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();