[ Upstream commit ceabee6c59943bdd5e1da1a6a20dc7ee5f8113a2 ]

In genl_register_family(), when idr_alloc() fails,
we forget to free the memory we possibly allocate for
family->attrbuf.
Reported-by: NHulk Robot <hulkci@huawei.com>
Fixes: 2ae0f17d ("genetlink: use idr to track families")
Signed-off-by: NYueHaibing <yuehaibing@huawei.com>
Reviewed-by: NKirill Tkhai <ktkhai@virtuozzo.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>