Merged revisions 246546 via svnmerge from

https://origsvn.digium.com/svn/asterisk/trunk

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  r246546 | dvossel | 2010-02-12 17:32:33 -0600 (Fri, 12 Feb 2010) | 21 lines
  
  Merged revisions 246545 via svnmerge from 
  https://origsvn.digium.com/svn/asterisk/branches/1.4
  
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    r246545 | dvossel | 2010-02-12 17:30:17 -0600 (Fri, 12 Feb 2010) | 16 lines
    
    lock channel during datastore removal
    
    On channel destruction the channel's datastores are removed and
    destroyed.  Since there are public API calls to find and remove
    datastores on a channel, a lock should be held whenever datastores are
    removed and destroyed.  This resolves a crash caused by a race
    condition in app_chanspy.c.
    
    (closes issue #16678)
    Reported by: tim_ringenbach
    Patches:
          datastore_destroy_race.diff uploaded by tim ringenbach (license 540)
    Tested by: dvossel
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git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/1.6.1@246548 65c4cc65-6c06-0410-ace0-fbb531ad65f3

main/channel.c

@@ -1389,9 +1389,11 @@ void ast_channel_free(struct ast_channel *chan)
 	}
 
 	/* Get rid of each of the data stores on the channel */
+	ast_channel_lock(chan);
 	while ((datastore = AST_LIST_REMOVE_HEAD(&chan->datastores, entry)))
 		/* Free the data store */
 		ast_datastore_free(datastore);
+	ast_channel_unlock(chan);
 
 	/* Lock and unlock the channel just to be sure nobody has it locked still
 	   due to a reference that was stored in a datastore. (i.e. app_chanspy) */