[Bug 482542] Re: grub-probe crashes with null pointer dereference in probe_raid_level

[Tommy_CZ]

same problem with MacbookAir2013 and Ubuntu 12.04.2.

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Title:
  grub-probe crashes with null pointer dereference in probe_raid_level

Status in “grub2” package in Ubuntu:
  Fix Released

Bug description:
  Binary package hint: grub2

  This occurs on a machine which previously worked just fine.  grub-pc
  is installed in the MBR of /dev/sda, which consists of a single
  partition with an LVM pv on there.  /boot is on /, which is on the
  Ubuntu-Root lv.  This worked fine.

  I installed a second SATA disc, created a single partition, and added
  it to the Primary-Storage vg.  Now, grub-probe segfaults when called
  with --target=abstraction, and the system fails to boot.

  Tracing things back with gdb, this occurs because probe_raid_level on
  grub-probe.c:167 is called with list->disk, which is NULL.  list->disk
  is NULL because grub_lvm_scan_device sets up the list of pvs
  associated with each vg, but only sets pv->disk for the device
  grub_lvm_scan_device was called on.  Since I did not have /dev/sdb in
  /boot/grub/device.map, grub_lvm_scan_device is not called with the
  device containing this pv.

  Upon adding an entry for /dev/sdb to /boot/grub/device.map grub-probe
  works, and grub boots the machine succesfully.

  ProblemType: Bug
  Architecture: amd64
  Date: Sat Nov 14 19:11:24 2009
  DistroRelease: Ubuntu 9.10
  Package: grub-common 1.97~beta4-1ubuntu4
  ProcEnviron:
   SHELL=/bin/zsh
   PATH=(custom, user)
   LANG=en_AU.UTF-8
  ProcVersionSignature: Ubuntu 2.6.31-15.50-generic
  SourcePackage: grub2
  Uname: Linux 2.6.31-15-generic x86_64

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