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Description of problem:

add_ip_config() in nm-dns-dnsmasq.c can access a NULL pointer when using the dnsmasq DNS backend and a device gets removed. This leads to a crash of the NM daemon.

Version-Release number of selected component (if applicable):
NetworkManager-1.12.0-5

Steps to Reproduce:
1. set dns=dnsmasq in the [main] section of /etc/NetworkManager/NetworkManager.conf
2. bring up some connections
3. remove the interface by unloading the kernel driver

Actual results:
crash

Additional info:
Reported at https://bugzilla.gnome.org/show_bug.cgi?id=797022

Fixed upstream: https://cgit.freedesktop.org/NetworkManager/NetworkManager/commit/?id=f0c075f05082e4c77fac75ad06d303e7538e4fc7

running well now.

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHBA-2018:3207