BUGFIX: Prevent exception when decoding to an invalid RID

Washi1337 · Feb 5, 2025 · 1e1f9b9 · 1e1f9b9 · github-actions · Feb 5, 2025
1 parent 6a4c633
commit 1e1f9b9
Showing 1 changed file with 5 additions and 0 deletions.
diff --git a/src/AsmResolver.PE/DotNet/Metadata/Tables/IndexEncoder.cs b/src/AsmResolver.PE/DotNet/Metadata/Tables/IndexEncoder.cs
@@ -76,6 +76,11 @@ public MetadataToken DecodeIndex(uint codedIndex)
             long tableIndex = codedIndex & _tableIndexBitMask;
             uint rowIndex = codedIndex >> _tableIndexBitCount;
 
+            // When RID is invalid, force an invalid metadata token without throwing an exception.
+            // See also https://github.com/Washi1337/AsmResolver/issues/608
+            if (rowIndex > 0x00FFFFFF)
+                rowIndex = 0;
+
             return new MetadataToken(tableIndex >= _tables.Length
                     ? TableIndex.Module
                     : _tables[tableIndex],