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

[Richard Laager]

The package from proposed works. I tested version 0.8.10ubuntu1.1. The
diff looks correct.

** Tags removed: verification-needed
** Tags added: verification-done

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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:
  Fix Committed
Status in ifupdown source package in Xenial:
  Fix Committed
Status in ifupdown package in Debian:
  New

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

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

  [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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