fixes https://www.samba.org/samba/security/CVE-2021-20254.html (cherry picked from commit 2db53555ee297acb1dbce22e4342ac6f37e14407)
fixes https://www.samba.org/samba/security/CVE-2021-20254.html (cherry picked from commit 2db53555ee297acb1dbce22e4342ac6f37e14407)