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Missing running state check #42

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@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.

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