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tipc: any name table member must be protected under name table lock 

As tipc_nametbl_lock is used to protect name_table structure, the lock
must be held while all members of name_table structure are accessed.
However, the lock is not obtained while a member of name_table
structure - local_publ_count is read in tipc_nametbl_publish(), as
a consequence, an inconsistent value of local_publ_count might be got.

Signed-off-by: Ying Xue <ying.xue@windriver.com>
Reviewed-by: Erik Hugne <erik.hugne@ericsson.com>
Reviewed-by: Jon Maloy <jon.maloy@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 2014-12-02 15:00:27 +08:00 committed by David S. Miller
parent fb9962f3ce
commit 3493d25cfb
1 changed files with 2 additions and 1 deletions
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3
net/tipc/name_table.c
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@ -656,13 +656,14 @@ struct publication *tipc_nametbl_publish(u32 type, u32 lower, u32 upper,
struct publication *publ;
struct sk_buff *buf = NULL;
write_lock_bh(&tipc_nametbl_lock);
if (tipc_nametbl->local_publ_count >= TIPC_MAX_PUBLICATIONS) {
pr_warn("Publication failed, local publication limit reached (%u)\n",
TIPC_MAX_PUBLICATIONS);
write_unlock_bh(&tipc_nametbl_lock);
return NULL;
}
write_lock_bh(&tipc_nametbl_lock);
publ = tipc_nametbl_insert_publ(type, lower, upper, scope,
tipc_own_addr, port_ref, key);
if (likely(publ)) {