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

[Michael Hudson-Doyle]

I posted https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=837732

** Bug watch added: Debian Bug tracker #837732
   http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=837732

** Also affects: ifupdown (Ubuntu Xenial)
   Importance: Undecided
       Status: New

** Description changed:

+ [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.

** Changed in: ifupdown (Ubuntu)
       Status: New => Fix Committed

** Changed in: ifupdown (Ubuntu Xenial)
       Status: New => In Progress

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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:
  In Progress

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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