sepolgen: correctly extract params from interface calls

diff -r 62550235fedc sepolgen/src/sepolgen/interfaces.py
@@ -71,7 +71,11 @@ def __param_insert(name, type, av, param
             # If the object is not implicitly typed, tell the
             # caller there is a likely conflict.
             ret = 1
-            for obj in itertools.chain(p.obj_classes, [av.obj_class]):
+            if av:
+                avobjs = [av.obj_class]
+            else:
+                avobjs = []
+            for obj in itertools.chain(p.obj_classes, avobjs):
                 if obj in objectmodel.implicitly_typed_objects:
                     ret = 0
                     break

@@ -181,6 +185,17 @@ def type_rule_extract_params(rule, param
         if __param_insert(rule.dest_type, refpolicy.DEST_TYPE, None, params):
             ret = 1
             
+    return ret
+
+def ifcall_extract_params(ifcall, params):
+    ret = 0
+    for arg in ifcall.args:
+        if access.is_idparam(arg):
+            # Assume interface arguments are source types. Fairly safe
+            # assumption for most interfaces
+            if __param_insert(arg, refpolicy.SRC_TYPE, None, params):
+                ret = 1
+
     return ret
             
 

@@ -229,6 +244,13 @@ class InterfaceVector:
                 pass
                 #print "found conflicting params in rule %s in interface %s" % \
                 #      (str(rule), interface.name)
+
+        for ifcall in interface.interface_calls():
+            if ifcall_extract_params(ifcall, self.params):
+                pass
+                #print "found conflicting params in ifcall %s in interface %s" % \
+                #      (str(ifcall), interface.name)
+            
 
     def add_av(self, av):
         if av_extract_params(av, self.params) == 1: