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tipc: fix connection refcount leak

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When tipc_conn_sendmsg() calls tipc_conn_lookup() to query a
connection instance, its reference count value is increased if
it's found. But subsequently if it's found that the connection is
closed, the work of sending message is not queued into its server
send workqueue, and the connection reference count is not decreased.
This will cause a reference count leak. To reproduce this problem,
an application would need to open and closes topology server
connections with high intensity.

We fix this by immediately decrementing the connection reference
count if a send fails due to the connection being closed.

Signed-off-by: Ying Xue <ying.xue@windriver.com>
Acked-by: Erik Hugne <erik.hugne@ericsson.com>
Reviewed-by: Jon Maloy <jon.maloy@ericsson.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Ying Xue 2014-03-06 14:40:17 +01:00 committed by David S. Miller
parent 6d4ebeb4df
commit 4652edb70e
1 changed files with 4 additions and 2 deletions
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6
net/tipc/server.c
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@ -427,10 +427,12 @@ int tipc_conn_sendmsg(struct tipc_server *s, int conid,
list_add_tail(&e->list, &con->outqueue);
spin_unlock_bh(&con->outqueue_lock);
if (test_bit(CF_CONNECTED, &con->flags))
if (test_bit(CF_CONNECTED, &con->flags)) {
if (!queue_work(s->send_wq, &con->swork))
conn_put(con);
} else {
conn_put(con);
}
return 0;
}