Add bounds checks for offset in classes that impl OwnedMemory

1 files changed, 3 insertions, 2 deletions

diff --git a/src/System.Memory/tests/Memory/CustomMemoryForTest.cs b/src/System.Memory/tests/Memory/CustomMemoryForTest.cs
index d663111bdb..618b18882e 100644
--- a/src/System.Memory/tests/Memory/CustomMemoryForTest.cs
+++ b/src/System.Memory/tests/Memory/CustomMemoryForTest.cs
@@ -39,13 +39,14 @@ namespace System.MemoryTests
             }
         }
 
-        public override MemoryHandle Pin(int index = 0)
+        public override MemoryHandle Pin(int offset = 0)
         {
             unsafe
             {
                 Retain();
+                if (offset < 0 || offset >= _array.Length) throw new ArgumentOutOfRangeException(nameof(offset));
                 var handle = GCHandle.Alloc(_array, GCHandleType.Pinned);
-                return new MemoryHandle(this, Unsafe.Add<byte>((void*)handle.AddrOfPinnedObject(), index), handle);
+                return new MemoryHandle(this, Unsafe.Add<byte>((void*)handle.AddrOfPinnedObject(), offset), handle);
             }
         }