Add some safety measures when using gosub, especially when using the options

for app_dial and app_queue to run a gosub when the call is answered.

* Check for the existence of the gosub target in gosub_exec. If it is nonexistent,
  then this will cause errors when we attempt to actually run the gosub, including
  a definite memory leak and potential crashes. Return an error in this situation
* Check the return value of pbx_exec in app_dial and app_queue before attempting
  to actually run the gosub routine. If there was an error, we should not attempt
  to run the gosub.
* Change a '|' to a ',' in app_queue.
* Add some extra curly braces where they had been missing previously.

(closes issue #13548)
Reported by: fiddur



git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@160626 65c4cc65-6c06-0410-ace0-fbb531ad65f3

apps/app_dial.c

@@ -2081,14 +2081,16 @@ static int dial_exec_full(struct ast_channel *chan, void *data, struct ast_flags
 
 				if (gosub_args) {
 					res9 = pbx_exec(peer, theapp, gosub_args);
-					ast_pbx_run(peer);
+					if (!res9) {
+						ast_pbx_run(peer);
+					}
 					ast_free(gosub_args);
 					if (option_debug)
 						ast_log(LOG_DEBUG, "Gosub exited with status %d\n", res9);
-				} else
+				} else {
 					ast_log(LOG_ERROR, "Could not Allocate string for Gosub arguments -- Gosub Call Aborted!\n");
+				}
 
-				res9 = 0;
 			} else if (!res9) {
 				ast_log(LOG_ERROR, "Could not find application Gosub\n");
 				res9 = -1;

apps/app_queue.c

@@ -3982,7 +3982,7 @@ static int try_calling(struct queue_ent *qe, const char *options, char *announce
 						ast_log(LOG_WARNING, "asprintf() failed: %s\n", strerror(errno));
 						gosub_args = NULL;
 					}
-					*gosub_argstart = '|';
+					*gosub_argstart = ',';
 				} else {
 					if (asprintf(&gosub_args, "%s,s,1", gosubexec) < 0) {
 						ast_log(LOG_WARNING, "asprintf() failed: %s\n", strerror(errno));
@@ -3991,13 +3991,14 @@ static int try_calling(struct queue_ent *qe, const char *options, char *announce
 				}
 				if (gosub_args) {
 					res = pbx_exec(peer, application, gosub_args);
-					ast_pbx_run(peer);
+					if (!res) {
+						ast_pbx_run(peer);
+					}
 					free(gosub_args);
 					ast_debug(1, "Gosub exited with status %d\n", res);
-				} else
+				} else {
 					ast_log(LOG_ERROR, "Could not Allocate string for Gosub arguments -- Gosub Call Aborted!\n");
-				
-				res = 0;
+				}
 			} else {
 				ast_log(LOG_ERROR, "Could not find application Gosub\n");
 				res = -1;

apps/app_stack.c

@@ -373,8 +373,9 @@ static int gosub_exec(struct ast_channel *chan, void *data)
 	/* Create the return address, but don't save it until we know that the Gosub destination exists */
 	newframe = gosub_allocate_frame(chan->context, chan->exten, chan->priority + 1, args2.argc);
 
-	if (!newframe)
+	if (!newframe) {
 		return -1;
+	}
 
 	if (ast_parseable_goto(chan, label)) {
 		ast_log(LOG_ERROR, "Gosub address is invalid: '%s'\n", (char *)data);
@@ -382,6 +383,16 @@ static int gosub_exec(struct ast_channel *chan, void *data)
 		return -1;
 	}
 
+	if (!ast_exists_extension(chan, chan->context, chan->exten, chan->priority, chan->cid.cid_num)) {
+		ast_log(LOG_ERROR, "Attempt to reach a non-existent destination for gosub: (Context:%s, Extension:%s, Priority:%d)\n",
+				chan->context, chan->exten, chan->priority);
+		ast_copy_string(chan->context, newframe->context, sizeof(chan->context));
+		ast_copy_string(chan->exten, newframe->extension, sizeof(chan->exten));
+		chan->priority = newframe->priority;
+		ast_free(newframe);
+		return -1;
+	}
+
 	/* Now that we know for certain that we're going to a new location, set our arguments */
 	for (i = 0; i < args2.argc; i++) {
 		snprintf(argname, sizeof(argname), "ARG%d", i + 1);