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-rw-r--r--miasm/analysis/data_flow.py3
1 files changed, 2 insertions, 1 deletions
diff --git a/miasm/analysis/data_flow.py b/miasm/analysis/data_flow.py
index bc6eab47..40a3b94e 100644
--- a/miasm/analysis/data_flow.py
+++ b/miasm/analysis/data_flow.py
@@ -2183,7 +2183,8 @@ class PropagateExpressions(object):
             ):
                 continue
 
-
+            if state_orig:
+                state.undefined.update(state_orig.undefined)
             states[loc_key] = state
             # Propagate to sons
             for successor in ircfg.successors(loc_key):