Merged revisions 270980 via svnmerge from

https://origsvn.digium.com/svn/asterisk/branches/1.4

........
  r270980 | qwell | 2010-06-16 16:10:09 -0500 (Wed, 16 Jun 2010) | 4 lines
  
  Need to lock the agent chan before access its internal bits.
  
  Pointed out by russellb on asterisk-dev mailing list.
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git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@270981 65c4cc65-6c06-0410-ace0-fbb531ad65f3

channels/chan_agent.c

@@ -2289,7 +2289,9 @@ static int function_agent(struct ast_channel *chan, const char *cmd, char *data,
 		ast_copy_string(buf, agent->moh, len);
 	else if (!strcasecmp(args.item, "channel")) {
 		if (agent->chan) {
+			ast_channel_lock(agent->chan);
 			ast_copy_string(buf, agent->chan->name, len);
+			ast_channel_unlock(agent->chan);
 			tmp = strrchr(buf, '-');
 			if (tmp)
 				*tmp = '\0';