Updating test cases.

cpp/ql/src/Critical/OverflowStatic.ql

@@ -42,7 +42,9 @@ class BufferAccess extends ArrayExpr {
     not exists(Macro m |
       m.getName() = "strcmp" and
       m.getAnInvocation().getAnExpandedElement() = this
-    )
+    ) and
+    //A buffer access must be reachable (not in dead code)
+    reachable(this)
   }
 
   int bufferSize() { staticBuffer(this.getArrayBase(), _, result) }

cpp/ql/src/Security/CWE/CWE-119/OverflowBuffer.ql

@@ -26,6 +26,7 @@ from
   BufferAccess ba, string bufferDesc, int accessSize, int accessType, Element bufferAlloc,
   int bufferSize, string message
 where
+  accessType != 4 and
   accessSize = ba.getSize() and
   bufferSize = getBufferSize(ba.getBuffer(bufferDesc, accessType), bufferAlloc) and
   (