Merged revisions 306618 via svnmerge from

https://origsvn.digium.com/svn/asterisk/branches/1.6.2

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  r306618 | twilson | 2011-02-07 13:59:54 -0800 (Mon, 07 Feb 2011) | 17 lines
  
  Merged revisions 306617 via svnmerge from 
  https://origsvn.digium.com/svn/asterisk/branches/1.4
  
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    r306617 | twilson | 2011-02-07 13:51:43 -0800 (Mon, 07 Feb 2011) | 10 lines
    
    Don't allow a REFER w/replaces to replace its own dialog
    
    Asterisk currently accepts a REFER with a Refer-To with an embedded Replaces
    header that matches the dialog of the REFER. This would be a situation like A
    calls B, A calls C, A transfers B to A, which is just silly. This patch makes
    the transfer fail instead of making Asterisk freak out and forget to hang other
    channels up.
    
    Review: https://reviewboard.asterisk.org/r/1093/
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git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/1.8@306619 65c4cc65-6c06-0410-ace0-fbb531ad65f3

channels/chan_sip.c

@@ -14727,7 +14727,15 @@ static int get_refer_info(struct sip_pvt *transferer, struct sip_request *outgoi
 			}
 			ast_copy_string(referdata->replaces_callid_fromtag, ptr, sizeof(referdata->replaces_callid_fromtag));
 		}
-		
+
+		if (!strcmp(referdata->replaces_callid, transferer->callid) &&
+			(!sip_cfg.pedanticsipchecking ||
+			(!strcmp(referdata->replaces_callid_fromtag, transferer->tag) &&
+			!strcmp(referdata->replaces_callid_totag, transferer->theirtag)))) {
+				ast_log(LOG_WARNING, "Got an attempt to replace own Call-ID on %s\n", transferer->callid);
+				return -4;
+		}
+
 		if (!sip_cfg.pedanticsipchecking) {
 			ast_debug(2, "Attended transfer: Will use Replace-Call-ID : %s (No check of from/to tags)\n", referdata->replaces_callid );
 		} else {