Fix a crash when attempting to spy on an unbridged channel.

(closes issue #12986)
Reported by: andrew53



git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@127831 65c4cc65-6c06-0410-ace0-fbb531ad65f3

apps/app_chanspy.c

@@ -359,18 +359,21 @@ static int channel_spy(struct ast_channel *chan, struct chanspy_ds *spyee_chansp
 		return 0;
 	}
 
-	ast_channel_lock(chan);
-	ast_set_flag(chan, AST_FLAG_END_DTMF_ONLY);
-	ast_channel_unlock(chan);
-
  	ast_audiohook_init(&csth.whisper_audiohook, AST_AUDIOHOOK_TYPE_WHISPER, "ChanSpy");
 	ast_audiohook_init(&csth.bridge_whisper_audiohook, AST_AUDIOHOOK_TYPE_WHISPER, "Chanspy");
   	start_spying(spyee, spyer_name, &csth.whisper_audiohook); /* Unlocks spyee */
-	start_spying(ast_bridged_channel(spyee), spyer_name, &csth.bridge_whisper_audiohook);
-
+	if ((spyee_bridge = ast_bridged_channel(spyee))) {
+		ast_channel_lock(spyee_bridge);
+		start_spying(ast_bridged_channel(spyee), spyer_name, &csth.bridge_whisper_audiohook);
+		ast_channel_unlock(spyee_bridge);
+	}
 	ast_channel_unlock(spyee);
 	spyee = NULL;
 
+	ast_channel_lock(chan);
+	ast_set_flag(chan, AST_FLAG_END_DTMF_ONLY);
+	ast_channel_unlock(chan);
+
 	csth.volfactor = *volfactor;
 
 	if (csth.volfactor) {