[Bug 901700] Re: netcfg segfauts when preseeding 12.04 LTS networkless

[Jonathan Davies]

Verified on VM on an isolated network with netcfg/enable=false.

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

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Title:
  netcfg segfauts when preseeding 12.04 LTS networkless

Status in “netcfg” package in Ubuntu:
  Fix Released
Status in “netcfg” source package in Precise:
  Fix Committed
Status in “netcfg” package in Debian:
  Fix Released

Bug description:
  SRU Justification:
  [Impact]
  netcfg will segfault if users use this feature in the preseed file.

  [Test Case]
  1) Add the following lines to your preseed file of your Ubuntu installation target:

  # Disable network configuration entirely. This is useful for cdrom
  # installations on non-networked devices where the network questions,
  # warning and long timeouts are a nuisance.
  d-i netcfg/enable boolean false
  d-i netcfg/get_hostname string BLABLABLA
  d-i netcfg/get_hostname seen true

  2) Start the installation that refers to this seed file.

  3) Wait until netcfg will load.

  => When loading the netcfg module, the installer will report an error
  (red message box). In the log console you will find a segfault message
  in the netcfg execution as mentioned above.

  [Regression Potential]

  This change removes an extra hostname variable definition that is
  defined in netcfg.c. This extra definition actually assigns NULL to
  the pointer, causing a segfault when that memory location is accessed.
  The hostname is defined externally to that file and is the correct
  variable to reference.

  Original Description
  --------------------

  I have built a USB-Stick to install Ubuntu Server Precise Alpha 1 64
  Bit based on the precise-alpha-1-amd64 ISO image.

  Installation works but the netcfg component segfaults!

  The installer screen shows an error. The 4th console shows:

  INFO: Menu item 'netcfg' selected
  INFO: Starting netcfg v.1.68ubuntu7 (built 2011-08-0004)
  WARNING **: Configuring 'netcfg' failed with error code 139
  WARNING **: Menu item 'netcfg' failed.
  netcfg[14152]: segfault at 0 ip 00007f8cc8e82572 sp 00007fffd1413bb8 error 6 in libc-2.13.so[7f8cc8d58000+195000]

  The installation continues when choosing the next item on the menu.

  These are the options used for preseeding netcfg:
  d-i netcfg/enable boolean false
  d-i netcfg/dhcp_options     select  Do not configure the network at this time
  d-i netcfg/dhcp_failed      note
  d-i netcfg/network-manager  boolean false
  # netcfg will choose an interface that has link if possible. This makes it
  #d-i netcfg/choose_interface select auto
  #d-i netcfg/disable_dhcp boolean true
  #d-i netcfg/get_nameservers string 192.168.1.1
  #d-i netcfg/get_ipaddress string 192.168.1.42
  #d-i netcfg/get_netmask string 255.255.255.0
  #d-i netcfg/get_gateway string 192.168.1.1
  #d-i netcfg/confirm_static boolean true
  d-i netcfg/get_hostname string lb-new
  d-i netcfg/get_domain string unassigned-domain
  d-i netcfg/wireless_wep string

  Any ideas?

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