[Bug 1618726] [NEW] ifup & ifdown crash if multiple interfaces are listed in no-scripts

[Richard Laager]

Public bug reported:

This is a trivially reproducible crash in ifup/ifdown.

Steps to reproduce:
1) echo no-scripts foo bar >> /etc/network/interfaces
2) ifup baz

Expected results:
Unknown interface baz

Actual results:
Segmentation fault (core dumped)

It's irrelevant whether the second interface is on the same no-scripts line or separate one. This will crash just the same:
echo no-scripts foo >> /etc/network/interfaces
echo no-scripts bar >> /etc/network/interfaces

** Affects: ifupdown (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1618726

Title:
  ifup & ifdown crash if multiple interfaces are listed in no-scripts

Status in ifupdown package in Ubuntu:
  New

Bug description:
  This is a trivially reproducible crash in ifup/ifdown.

  Steps to reproduce:
  1) echo no-scripts foo bar >> /etc/network/interfaces
  2) ifup baz

  Expected results:
  Unknown interface baz

  Actual results:
  Segmentation fault (core dumped)

  It's irrelevant whether the second interface is on the same no-scripts line or separate one. This will crash just the same:
  echo no-scripts foo >> /etc/network/interfaces
  echo no-scripts bar >> /etc/network/interfaces

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