Prevent infinite recursion in the DWARF parser

chaoticgd · Oct 31, 2024 · 92d81b5 · 92d81b5
1 parent 43cc707
commit 92d81b5
Showing 1 changed file with 3 additions and 0 deletions.
diff --git a/src/ccc/dwarf_section.cpp b/src/ccc/dwarf_section.cpp
@@ -196,6 +196,9 @@ Result<std::optional<DIE>> DIE::sibling() const
 		CCC_RETURN_IF_ERROR(attribute);
 
 		if (attribute->attribute == AT_sibling && attribute->value.form() == FORM_REF) {
+			// Prevent infinite recursion if the file contains a cycle.
+			CCC_CHECK(attribute->value.reference() > m_offset,
+				"Sibling attribute of DIE at 0x%x points backwards.", m_offset);
 			return DIE::parse(m_debug, attribute->value.reference(), m_importer_flags);
 		}
 	}