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MdeModulePkg/RuntimeDxe: clear mVirtualMapMaxIndex

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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>
This commit is contained in:
Gerd Hoffmann 2022-01-21 20:58:48 +08:00 committed by mergify[bot]
parent d4ac53aa91
commit f78b937c95
1 changed files with 2 additions and 1 deletions
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3
MdeModulePkg/Core/RuntimeDxe/Runtime.c
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@ -365,7 +365,8 @@ RuntimeDriverSetVirtualAddressMap (
// //
// mVirtualMap is only valid during SetVirtualAddressMap() call // mVirtualMap is only valid during SetVirtualAddressMap() call
// //
mVirtualMap = NULL; mVirtualMap = NULL;
mVirtualMapMaxIndex = 0;
return EFI_SUCCESS; return EFI_SUCCESS;
} }