liblibsmb segfaults browsing Windows Shares with Caja or Nautilus

[Juan Pablo Firrincieli]

I tried to browse a Windows Share and after input of my credentials Caja fallbacks to computer:/// instead of showing the contents of the Windows Share, after looking in /etc/syslog I've found:

Apr 13 13:02:56 quasar-workstation org.gtk.vfs.Daemon[1539]: ### SMB: do_mount - [smb://bbvdfs.bf/dfs; 1] res = 0, cancelled = 0, errno = [0] 'Conseguido'
Apr 13 13:02:56 quasar-workstation org.gtk.vfs.Daemon[1539]: ### SMB: do_mount - login successful
Apr 13 13:02:56 quasar-workstation org.gtk.vfs.Daemon[1539]: no talloc stackframe at ../source3/libsmb/clifsinfo.c:444, leaking memory
Apr 13 13:02:56 quasar-workstation org.gtk.vfs.Daemon[1539]: Kinit failed: Cannot determine realm for host
Apr 13 13:03:04 quasar-workstation kernel: [ 782.807162] pool[2202]: segfault at 98 ip 00007f3cf840e91d sp 00007f3ceaed5ac0 error 4 in liblibsmb.so.0[7f3cf83ec000+62000]

Steps to reproduce:

1. Launch Caja
2. Navigate to a Windows non public Share

[Juan Pablo Firrincieli (jpfirr)]

$ caja --version
MATE caja 1.8.2

$l sb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu Vivid Vervet (development branch)
Release: 15.04
Codename: vivid

$ apt-cache show libsmbclient | grep Version
Version: 2:4.1.13+dfsg-4ubuntu3

[Martin Wimpress (flexiondotorg)]

I've reproduce this using Nautilus from stock Ubuntu 15.04 daily from 17th April 2015.

[Adam Conrad (adconrad)]

Based on the segfault being in liblibsmb, I'm reassigning this to samba. Further investigation required to sort out what's actually going on.

[Ubuntu QA Website (ubuntuqa)]

This bug has been reported on the Ubuntu ISO testing tracker.

A list of all reports related to this bug can be found here:
http://iso.qa.ubuntu.com/qatracker/reports/bugs/1443525