** Description changed:

- This looks like bug 934471 happening again.  The patch that fixed that
- bug does appear to be present in the raring source.  So I don't know
- what's happening.  :(
+ [Impact]
+ vlc, lsdvd, and other video players crash in dvdnav_describe_title_chapters() 
when playing the "Inside Man" DVD (and probably others).  Pretty easily 
reproducible.
+ 
+ [TESTCASE]
+ wget 
https://bugs.launchpad.net/ubuntu/+source/libdvdnav/+bug/1094499/+attachment/3642743/+files/ifo-files.tar.xz
+ tar xf ifo-files.tar.xz
+ vlc .
+ 
+ [Regression Potential]
+ Essentially none, this patch merely sanity checks a counter if it's extremely 
outside its expected range, and skips the invalid item if it is.  No DVDs 
should have values outside this range, unless they suffer from this bug. 
+ 
+ [Original Report]
+ This looks like bug 934471 happening again.  The patch that fixed that bug 
does appear to be present in the raring source.  So I don't know what's 
happening.  :(
  
  At least one dvd that I have, but not all dvds, cause this crash in both
  vlc and totem.  Just like bug 934471.
  
  This system has libdvdcss2 installed, from medibuntu, version
  1.2.12-0.0medibuntu1.  In case that's relevant.
  
  Thanks.
- 
- [TESTCASE]
- wget 
https://bugs.launchpad.net/ubuntu/+source/libdvdnav/+bug/1094499/+attachment/3642743/+files/ifo-files.tar.xz
- tar xf ifo-files.tar.xz
- vlc .
  
  ProblemType: Crash
  DistroRelease: Ubuntu 13.04
  Package: vlc-nox 2.0.5-1
  ProcVersionSignature: Ubuntu 3.7.0-7.5-lowlatency 3.7.0
  Uname: Linux 3.7.0-7-lowlatency x86_64
  ApportVersion: 2.7-0ubuntu2
  Architecture: amd64
  Date: Sat Dec 29 11:51:10 2012
  ExecutablePath: /usr/bin/vlc
  MarkForUpload: True
  ProcCmdline: /usr/bin/vlc /media/username/DVD_VIDEO
  ProcEnviron:
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  SegvAnalysis:
   Segfault happened at: 0x7fb974591b16 <dvdnav_describe_title_chapters+374>:   
movzbl 0x2(%r15),%edi
   PC (0x7fb974591b16) ok
   source "0x2(%r15)" (0x00000027) not located in a known VMA region (needed 
readable region)!
   destination "%edi" ok
   Stack memory exhausted (SP below stack segment)
  SegvReason: reading NULL VMA
  Signal: 11
  SourcePackage: vlc
  StacktraceTop:
   dvdnav_describe_title_chapters () from 
/usr/lib/x86_64-linux-gnu/libdvdnav.so.4
   ?? () from /usr/lib/vlc/plugins/access/libdvdnav_plugin.so
   vlc_module_load () from /usr/lib/libvlccore.so.5
   ?? () from /usr/lib/libvlccore.so.5
   ?? () from /usr/lib/libvlccore.so.5
  Title: vlc crashed with SIGSEGV in dvdnav_describe_title_chapters()
  UpgradeStatus: Upgraded to raring on 2012-06-14 (197 days ago)
  UserGroups: adm cdrom dip lpadmin nopasswdlogin plugdev sambashare sudo

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Title:
  vlc crashed with SIGSEGV in dvdnav_describe_title_chapters()

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