[Bug 1062167] Re: Segfault in __libc_res_nquerydomain

[Dave Gilbert]

Triaged: Trivial test case and pointer to fix
Medium: Reasonable starter; if you can point to it being triggerable in some apps then it might be higher

This triggers in Quantal libc6 2.15-0ubuntu20 , and as I understand it, it needs to get fixed in the dev version before being SRUd
to 12.04.


** Changed in: eglibc (Ubuntu)
   Importance: Undecided => Medium

** Changed in: eglibc (Ubuntu)
       Status: New => Triaged

** Tags added: patch

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Title:
  Segfault in __libc_res_nquerydomain

Status in “eglibc” package in Ubuntu:
  Triaged

Bug description:
  Ubuntu 12.04 contains a bug in the eglibc (libc6) package.
  It was introduced here:
  http://www.eglibc.org/cgi-bin/viewvc.cgi/trunk/libc/resolv/res_query.c?r1=13759&r2=14662
  glibc commit 28b59fca7ae3cfc2d57e0007aaa3793d4b775e97

  And fixed here:
  http://www.eglibc.org/cgi-bin/viewvc.cgi/trunk/libc/resolv/res_query.c?r1=15869&r2=17385
  glibc commit 8fdceb2efda8cf724cfc4444af86b5f135ad3172

  Reproduce:
  #include <netdb.h>
  int main(void)
  {
      gethostbyname("." + 1);
  }

  I believe that the patch is correct.
  Can you please apply it to 12.04?

  $ lsb_release -rd
  Description:	Ubuntu 12.04 LTS
  Release:	12.04

  $ apt-cache policy libc6
  libc6:
    Installed: 2.15-0ubuntu10.2
    Candidate: 2.15-0ubuntu10.2
    Version table:
   *** 2.15-0ubuntu10.2 0
          500 http://us-east-1.ec2.archive.ubuntu.com/ubuntu/ precise-updates/main amd64 Packages
          500 http://security.ubuntu.com/ubuntu/ precise-security/main amd64 Packages
          100 /var/lib/dpkg/status
       2.15-0ubuntu10 0
          500 http://us-east-1.ec2.archive.ubuntu.com/ubuntu/ precise/main amd64 Packages

  > What you expected to happen
  Not a segfault but maybe an error code.

  > What happened instead
  Segfault.

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