Comment 46 for bug 1939733

Reviewed: https://review.opendev.org/c/openstack/neutron/+/806709
Committed: https://opendev.org/openstack/neutron/commit/110fed07cb83deb3abd85073cb351066713b6384
Submitter: "Zuul (22348)"
Branch: stable/queens

commit 110fed07cb83deb3abd85073cb351066713b6384
Author: Slawek Kaplonski <email address hidden>
Date: Mon Aug 23 13:01:37 2021 +0200

    Remove dhcp_extra_opt value after first newline character

    Passing newline to the dnsmasq may cause security issues, especially
    that in case of Neutron that dhcp options' values are controlled by
    cloud users.
    This patch removes everything what is after first newline character
    in the dhcp_extra_opt's values before passing them to dnsmasq.

    Conflicts:
        neutron/tests/unit/agent/linux/test_dhcp.py

    Closes-Bug: #1939733
    Change-Id: Ifeaf258f0b5ea86f25620ac4116d618980a7272e
    (cherry picked from commit df891f0593d234e01f27d7c0376d9702e178ecfb)