Fix #2530: ArgumentOutOfRangeException in PatternMatchRefTypes

icsharpcode · Nov 6, 2021 · 22c9801 · 22c9801
1 parent 7463010
commit 22c9801
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/ICSharpCode.Decompiler/IL/Transforms/PatternMatchingTransform.cs b/ICSharpCode.Decompiler/IL/Transforms/PatternMatchingTransform.cs
@@ -132,7 +132,7 @@ private bool PatternMatchRefTypes(Block block, BlockContainer container, ILTrans
 			{
 				// stloc v(ldloc s)
 				pos--;
-				if (!block.Instructions[pos].MatchStLoc(s, out value))
+				if (pos < 0 || !block.Instructions[pos].MatchStLoc(s, out value))
 					return false;
 				if (v.Kind is not (VariableKind.Local or VariableKind.StackSlot))
 					return false;