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    • Richard Mudgett's avatar
      Merged revisions 337974 via svnmerge from · 55b70ae6
      Richard Mudgett authored
      https://origsvn.digium.com/svn/asterisk/branches/10
      
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        r337974 | rmudgett | 2011-09-26 14:35:23 -0500 (Mon, 26 Sep 2011) | 37 lines
        
        Merged revisions 337973 via svnmerge from 
        https://origsvn.digium.com/svn/asterisk/branches/1.8
        
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          r337973 | rmudgett | 2011-09-26 14:30:39 -0500 (Mon, 26 Sep 2011) | 30 lines
          
          Fix deadlock when using dummy channels.
          
          Dummy channels created by ast_dummy_channel_alloc() should be destoyed by
          ast_channel_unref().  Using ast_channel_release() needlessly grabs the
          channel container lock and can cause a deadlock as a result.
          
          * Analyzed use of ast_dummy_channel_alloc() and made use
          ast_channel_unref() when done with the dummy channel.  (Primary reason for
          the reported deadlock.)
          
          * Made app_dial.c:dial_exec_full() not call ast_call() holding any channel
          locks.  Chan_local could not perform deadlock avoidance correctly.
          (Potential deadlock exposed by this issue.  Secondary reason for the
          reported deadlock since the held lock was part of the deadlock chain.)
          
          * Fixed some uses of ast_dummy_channel_alloc() not checking the returned
          channel pointer for failure.
          
          * Fixed some potential chan=NULL pointer usage in func_odbc.c.  Protected
          by testing the bogus_chan value.
          
          * Fixed needlessly clearing a 1024 char auto array when setting the first
          char to zero is enough in manager.c:action_getvar().
          
          (closes issue ASTERISK-18613)
          Reported by: Thomas Arimont
          Patches:
                jira_asterisk_18613_v1.8.patch (license #5621) patch uploaded by rmudgett
          Tested by: Thomas Arimont
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      git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@337975 65c4cc65-6c06-0410-ace0-fbb531ad65f3
      55b70ae6
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