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When setting mVirtualMap to NULL also set mVirtualMapMaxIndex to 0. Without that RuntimeDriverConvertPointer() will go search the ZeroPage for EFI_MEMORY_DESCRIPTOR entries. In case mVirtualMapMaxIndex happens to be small small enough that'll go unnoticed, the search will not find anything and EFI_NOT_FOUND will be returned. In case mVirtualMapMaxIndex is big enough the search will reach the end of the ZeroPage and trigger a page fault. Signed-off-by: Gerd Hoffmann <kraxel@redhat.com> Reviewed-by: Liming Gao <gaoliming@byosoft.com.cn>