GP-3417 fixed case where si vtable was not getting created bc too man…

…y refs. Added secondary check. Added check for same num special vtable and typeinfos.

Ghidra/Features/Decompiler/ghidra_scripts/classrecovery/RTTIGccClassRecoverer.java

@@ -204,6 +204,11 @@ public List<RecoveredClass> createRecoveredClasses() throws CancelledException,
  Msg.debug(this, "Could not create special vtables");
  return null;
  }
+
+ if(specialVtables.size() != specialTypeinfos.size()) {
+ Msg.debug(this, "Not equal number of special vtables and special typeinfos");
+ return null;
+ }
 
  setComponentOffset();
 
@@ -3382,6 +3387,13 @@ private Address findSpecialVtableUsingSpecialTypeinfo(Address typeinfoAddress, L
  if (specialTypeinfoAddrSet.contains(refTo)) {
  continue;
  }
+
+ // all special vtables have zeros just before the ref to typeinfo
+ Address vtableAddress = refTo.subtract(defaultPointerSize);
+ if (!isPossibleNullPointer(vtableAddress)) {
+ continue;
+ }
+
  possibleRefsInVtable.add(refTo);
  }
  if (possibleRefsInVtable.size() != 1) {