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"Somewhere along the line the NULL check in br_mdb_ip_get went AWOL,
causing crashes when we receive an IGMP packet with no multicast table
This patch restores it and ensures all br_mdb_*_get functions use it."
Did a quick check: net/bridge/br_multicast.c was introduced in eb1d1641
(2.6.34-rc1), the check was removed in 8ef2a9a5 (v2.6.35-rc1), and
subsequently restored in 7f285fa78d (v2.6.35-rc5).