From 6c20f4b2a28bf643a50b7e00cb5b0ccabdb15346 Mon Sep 17 00:00:00 2001
From: PKEuS <philipp.kloke@web.de>
Date: Wed, 4 Nov 2015 10:10:20 +0100
Subject: [PATCH] Fixed crash on garbage code (#7090)

---
 lib/tokenize.cpp     | 4 ++--
 test/testgarbage.cpp | 9 +++++++++
 2 files changed, 11 insertions(+), 2 deletions(-)

diff --git a/lib/tokenize.cpp b/lib/tokenize.cpp
index 0fc89d294..09a126b25 100644
--- a/lib/tokenize.cpp
+++ b/lib/tokenize.cpp
@@ -347,8 +347,8 @@ bool Tokenizer::duplicateTypedef(Token **tokPtr, const Token *name, const Token
                                 return false;
                             }
                         }
-
-                        tok = tok->previous();
+                        if (tok)
+                            tok = tok->previous();
                     }
 
                     if ((*tokPtr)->strAt(1) != "(" || !Token::Match((*tokPtr)->linkAt(1), ") .|(|[")) {
diff --git a/test/testgarbage.cpp b/test/testgarbage.cpp
index f96d86f1c..d9fbf57f7 100644
--- a/test/testgarbage.cpp
+++ b/test/testgarbage.cpp
@@ -196,6 +196,7 @@ private:
         TEST_CASE(garbageCode145); // #7074
         TEST_CASE(garbageCode146); // #7081
         TEST_CASE(garbageCode147); // #7082
+        TEST_CASE(garbageCode148); // #7090
 
         TEST_CASE(garbageValueFlow);
         TEST_CASE(garbageSymbolDatabase);
@@ -1168,6 +1169,14 @@ private:
         checkCode("; void f ^ { return } int main ( ) { }"); // #4941
     }
 
+    void garbageCode148() { // #7090
+        ASSERT_THROW(checkCode("void f_1() {\n"
+                               "    typedef S0 b[][1][1] != 0\n"
+                               "};\n"
+                               "b[K][0] S0 b[][1][1] != 4{ 0 };\n"
+                               "b[0][0]"), InternalError);
+    }
+
     void garbageValueFlow() {
         // #6089
         const char* code = "{} int foo(struct, x1, struct x2, x3, int, x5, x6, x7)\n"