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For ports that have a NULL dp->bridge_dev, dsa_port_to_bridge_port()
also returns NULL as expected.
Issue #1 is that we are performing a NULL pointer dereference on brport_dev.
Issue #2 is that these are ports on which switchdev_bridge_port_offload
has not been called, so we should not call switchdev_bridge_port_unoffload
on them either.
Both issues are addressed by checking against a NULL brport_dev in
dsa_port_pre_bridge_leave and exiting early.
Fixes: 2f5dc00f7a3e ("net: bridge: switchdev: let drivers inform which bridge ports are offloaded")
Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
09dba21b43