C++: Handle 'isSink' without states in the backwards-compatibility code and in taint-tracking

Author: MathiasVP

cpp/ql/lib/semmle/code/cpp/ir/dataflow/internal/DataFlowImpl1.qll

@@ -276,6 +276,8 @@ private module Config implements FullStateConfigSig {
     getConfig(state).isSource(source) and getState(state) instanceof FlowStateEmpty
   }
 
+  predicate isSink(Node sink) { none() }
+
   predicate isSink(Node sink, FlowState state) {
     getConfig(state).isSink(sink, getState(state))
     or

cpp/ql/lib/semmle/code/cpp/ir/dataflow/internal/tainttracking1/TaintTracking.qll

@@ -24,6 +24,7 @@ private module AddTaintDefaults<DataFlowInternal::FullStateConfigSig Config> imp
     Config::allowImplicitRead(node, c)
     or
     (
+      Config::isSink(node) or
       Config::isSink(node, _) or
       Config::isAdditionalFlowStep(node, _) or
       Config::isAdditionalFlowStep(node, _, _, _)