Java: Adjust Paths.qll

Author: aschackmull

java/ql/lib/semmle/code/java/controlflow/Paths.qll

@@ -66,6 +66,10 @@ private class JoinBlock extends BasicBlock {
   JoinBlock() { 2 <= strictcount(this.getAPredecessor()) }
 }
 
+private class ReachableBlock extends BasicBlock {
+  ReachableBlock() { hasDominanceInformation(this) }
+}
+
 /**
  * Holds if `bb` is a block that is collectively dominated by a set of one or
  * more actions that individually does not dominate the exit.
@@ -74,7 +78,7 @@ private predicate postActionBlock(BasicBlock bb, ActionConfiguration conf) {
   bb = nonDominatingActionBlock(conf)
   or
   if bb instanceof JoinBlock
-  then forall(BasicBlock pred | pred = bb.getAPredecessor() | postActionBlock(pred, conf))
+  then forall(ReachableBlock pred | pred = bb.getAPredecessor() | postActionBlock(pred, conf))
   else postActionBlock(bb.getAPredecessor(), conf)
 }