[PATCH net-next 08/11] tipc: make media_ptr pointed netdevice valid

[Ying Xue <ying.xue@windriver.com>]

The 'media_ptr' pointer in bearer structure which points to network
device, is protected by RCU. So, before netdevice is released,
synchronize_net() should be involved to prevent no any user of
the netdevice on read side from accessing it after it is freed.

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>
---
 net/tipc/bearer.c |    1 +
 1 file changed, 1 insertion(+)

diff --git a/net/tipc/bearer.c b/net/tipc/bearer.c
index 1bd96eb..402e994 100644
--- a/net/tipc/bearer.c
+++ b/net/tipc/bearer.c
@@ -471,6 +471,7 @@ void tipc_disable_l2_media(struct tipc_bearer *b)
 	dev = (struct net_device *)rtnl_dereference(b->media_ptr);
 	RCU_INIT_POINTER(b->media_ptr, NULL);
 	RCU_INIT_POINTER(dev->tipc_ptr, NULL);
+	synchronize_net();
 	dev_put(dev);
 }
 
-- 
1.7.9.5


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