From c4419ea92048741d64b06ff2534ec491619d8b73 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Daniel=20Marjam=E4ki?= <daniel.marjamaki@gmail.com>
Date: Sat, 2 Mar 2013 15:49:48 +0100
Subject: [PATCH] AST: create possible NULL pointer dereference if tokenlist is
 empty. Ticket: #4630

---
 lib/tokenlist.cpp | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/lib/tokenlist.cpp b/lib/tokenlist.cpp
index 9ec11e827..59f0a0fe4 100644
--- a/lib/tokenlist.cpp
+++ b/lib/tokenlist.cpp
@@ -376,6 +376,10 @@ void TokenList::createAst()
         " [ "
     };
 
+    // No tokens => bail out
+    if (!_front)
+        return;
+
     for (unsigned int i = 0; i < sizeof(operators) / sizeof(*operators); ++i) {
         // TODO: extract operators to std::set - that should be faster
         if (*operators[i] == '>') {  // Unary operators, parse from right to left