[augeas-devel] [Augeas] #136: Segfault with regular recursive lens

[Augeas]

#136: Segfault with regular recursive lens
-------------------------+--------------------------------------------------
  Reporter:  fgiraldeau  |       Owner:  lutter             
      Type:  defect      |      Status:  new                
  Priority:  major       |   Milestone:  next               
 Component:  Augeas      |     Version:  devel              
Resolution:              |    Keywords:  recursive, segfault
-------------------------+--------------------------------------------------
Changes (by fgiraldeau):

  * owner:  fgiraldeau => lutter
  * version:  0.7.0 => devel

Comment:

 The bug was occuring because of an empty stack. Only subtree lens are
 pushing frames on the stack. With the lens

   let rec l = [...] . l?

 no subtree is encountered, because the parse is followed backward, and
 then the stack is empty when the first visit_exit for maybe lens occurs.

 The patch prevent dereferencing empty pointer. All the process after it
 works well. The patch include a test for both sides.

 All tests ran with this patch. I reassign this bug to commit the patch.

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Ticket URL: <https://fedorahosted.org/augeas/ticket/136#comment:1>
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