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commit 7bb90c3715a496c650b2e879225030f9dd9cfafb upstream.
Adding fdb entries pointing to the bridge device uses fdb_insert(),
which lacks various checks and does not respect added_by_user flag.
As a result, some inconsistent behavior can happen:
* Adding temporary entries succeeds but results in permanent entries.
* Same goes for "dynamic" and "use".
* Changing mac address of the bridge device causes deletion of
user-added entries.
* Replacing existing entries looks successful from userspace but actually
not, regardless of NLM_F_EXCL flag.
Use the same logic as other entries and fix them.
Fixes: 3741873b4f73 ("bridge: allow adding of fdb entries pointing to the bridge device")
Signed-off-by: Toshiaki Makita <makita.toshiaki@lab.ntt.co.jp>
Acked-by: Roopa Prabhu <roopa@cumulusnetworks.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
d7633eef5d