Fixed #972 (New check: return pointer of stack memory)

lib/tokenize.cpp

@@ -3769,6 +3769,12 @@ bool Tokenizer::simplifyKnownVariables()
                         tok3 = tok3->next();
                         ret = true;
                     }
+
+                    // return variable..
+                    if (Token::Match(tok3, "return %varid% ;", varid))
+                    {
+                        tok3->next()->str(value);
+                    }
                 }
             }
         }

test/testsimplifytokens.cpp

@@ -2473,6 +2473,24 @@ private:
 
             ASSERT_EQUALS(expected, tok(code));
         }
+
+        {
+            const char code[] = "int *foo()\n"
+                                "{\n"
+                                "    int a[10];\n"
+                                "    int *b = a;\n"
+                                "    return b;\n"
+                                "}\n";
+
+            const char expected[] = "int * foo ( ) "
+                                    "{ "
+                                    "int a [ 10 ] ; "
+                                    "int * b ; b = a ; "
+                                    "return a ; "
+                                    "}";
+
+            ASSERT_EQUALS(expected, tok(code));
+        }
     }