--- res/res_agi.c	2005-12-05 20:35:50.000000000 -0600
+++ res/res_agi.c.mod	2005-12-05 19:20:16.000000000 -0600
@@ -232,6 +232,14 @@
 		snprintf(tmp, sizeof(tmp), "%s/%s", (char *)ast_config_AST_AGI_DIR, script);
 		script = tmp;
 	}
+	if (access(script, F_OK)) {
+		ast_log(LOG_WARNING, "Unable to execute %s: File does not exist\n", script);
+		return -1;
+	}
+	if (access(script, X_OK)) {
+		ast_log(LOG_WARNING, "Unable to execute %s: File is not executable\n", script);
+		return -1;
+	}
 	if (pipe(toast)) {
 		ast_log(LOG_WARNING, "Unable to create toast pipe: %s\n",strerror(errno));
 		return -1;