Fix use-after-free bug.

ethereum · Oct 25, 2021 · 785e16f · 785e16f
1 parent 5e8dba8
commit 785e16f
Showing 1 changed file with 2 additions and 1 deletion.
diff --git a/libyul/ControlFlowSideEffectsCollector.cpp b/libyul/ControlFlowSideEffectsCollector.cpp
@@ -212,7 +212,8 @@ ControlFlowSideEffectsCollector::ControlFlowSideEffectsCollector(
 			if (calledSideEffects->canRevert)
 				sideEffects.canRevert = true;
 
-			for (YulString callee: util::valueOrDefault(m_functionCalls, _function))
+			set<YulString> emptySet;
+			for (YulString callee: util::valueOrDefault(m_functionCalls, _function, emptySet))
 				_recurse(callee, _recurse);
 		};
 		for (auto const& call: calls)