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Fix accessing a null element in a byref array #3239

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Merged
merged 1 commit into from
Nov 13, 2025
Merged

Fix accessing a null element in a byref array #3239

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10 changes: 10 additions & 0 deletions src/CLR/Core/TypeSystem.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -2546,6 +2546,16 @@ HRESULT CLR_RT_TypeDescriptor::InitializeFromObject(const CLR_RT_HeapBlock &ref)
{
obj = (CLR_RT_HeapBlock *)array->GetElement(obj->ArrayIndex());

// For reference arrays, if the element is null, we need to get the type from the array's element
// type rather than trying to dereference a null object
if (obj->Dereference() == nullptr)
{
// Use the array's element type.
// Keep 'reflex' null to avoid carrying array levels when returning an element type.
cls = &(array->ReflectionDataConst().data.type);
break;
}

NANOCLR_SET_AND_LEAVE(InitializeFromObject(*obj));
}

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