Missing running state check

[Lirong-source]

Hi, in linux-3.10 net/bridge/br_multicast.c, line 1704, br_multicast_set_router, the kernel of dd-wrt deleted the check for be>dev, which is a check for the running state (i.e., test if the device has been brought up). Such a missing check may lead to denial of service.

[BrainSlayer]

multicast traffic will always lead to denial of service if you flood a network with packets. no matter if this check exists or not. unfortunatly i cannot remember the purpose of this patch