Optimize _encode_invalid_chars for a denial of service (CPU consumption)
CVE: CVE-2020-7212
Signed-off-by: Haiqing Bai <Haiqing.Bai@windriver.com>
Signed-off-by: Armin Kuster <akuster808@gmail.com>
Signed-off-by: Harpritkaur Bhandari <Harpritkaur.Bhandari@kpit.com>
[Add CVE: CVE-2020-7212 to the patch itself]
Signed-off-by: Armin Kuster <akuster808@gmail.com>