[Bug 899243] Re: [fsck.minix ] segfault while recovering directory with lots of files

[Brian Murray]

** Changed in: util-linux (Ubuntu)
       Status: New => Triaged

** Changed in: util-linux (Ubuntu)
   Importance: Undecided => Medium

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https://bugs.launchpad.net/bugs/899243

Title:
  [fsck.minix ] segfault while recovering directory with lots  of files

Status in “util-linux” package in Ubuntu:
  Triaged

Bug description:
  fsck.minix (version V2) crashes when recovering a directory containing
  a high number of files (e.g., 9000 dummy files).

  fsck.minix wrongly determines when a block is pointed by a triple
  indirect pointer, in the following line (in map_block2 function):

  if (blknr >= 256 * 256) // this should be blknr <= 256 * 256

  This error leads to a negative block number which leads to a wrong
  memory access and to a segmentation fault.

  I have attached a patch that fixes the problem. I can provide a sample
  disk that exercises the error.

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