net: rtnetlink: address is mandatory for rtnl_fdb_get
We must have an address to lookup otherwise we'll derefence a null pointer in the ndo_fdb_get callbacks. CC: Roopa Prabhu <roopa@cumulusnetworks.com> CC: David Ahern <dsa@cumulusnetworks.com> Reported-by:<syzbot+017b1f61c82a1c3e7efd@syzkaller.appspotmail.com> Fixes: 5b2f94b2 ("net: rtnetlink: support for fdb get") Signed-off-by:
Nikolay Aleksandrov <nikolay@cumulusnetworks.com> Acked-by:
Roopa Prabhu <roopa@cumulusnetworks.com> Signed-off-by:
David S. Miller <davem@davemloft.net>
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