Fixes CVEs:
CVE-2018-5738
CVE-2018-5740
CVE-2018-5743
CVE-2018-5744
CVE-2018-5745
CVE-2019-6465
CVE-2019-6471
Signed-off-by: DENG Qingfang <dengqf6@mail2.sysu.edu.cn>
Signed-off-by: Josef Schlehofer <pepe.schlehofer@gmail.com>
[mention fixed CVEs;patches: refreshed and removed those which are in
upstream now]