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

Status in ifupdown package in Ubuntu:
  Fix Released
Status in ifupdown source package in Xenial:
  Fix Released
Status in ifupdown package in Debian:
  Fix Released

Bug description:
  ifup and ifupdown segfault if multiple interfaces are listed in no-scripts

  This is a trivially reproducible crash in ifup/ifdown, with a patch

  [Test Case]
  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

  [Regression potential]
  Seems slight. The patch fixes a clear bug in code that is only used to 
process the no-scripts (and apparently no-auto-down) stanzas.

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