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Patch #2 adds a test case that triggers the problem. In net-next we can: 1. Add DEBUG_NET_WARN_ON_ONCE() when a port multicast context is de-initialized while enabled. 2. When de-initializing a port multicast context, synchronously shutdown all the timers that were initialized when the context was initialized. Ido Schimmel (2): bridge: mcast: Fix a possible use-after-free when removing a bridge port selftests: bridge_vlan_mcast: Test toggling of multicast snooping net/bridge/br_multicast.c | 22 ++++++++++---- .../net/forwarding/bridge_vlan_mcast.sh | 30 ++++++++++++++++++- 2 files changed, 46 insertions(+), 6 deletions(-) -- 2.54.0