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

[Richard Laager]

** Patch added: "A fix for xenial"
   https://bugs.launchpad.net/ubuntu/+source/ifupdown/+bug/1618726/+attachment/4731337/+files/ifupdown-fix-1618726-xenial.debdiff

** Description changed:

- This is a trivially reproducible crash in ifup/ifdown.
+ This is a trivially reproducible crash in ifup/ifdown, with a patch
+ attached.
  
  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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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, with a patch
  attached.

  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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