Hi Chasel
Can we change " if ((IdtDescriptor.Base == 0) && (IdtDescriptor.Limit ==
0xFFFF)) {" to " if (IdtDescriptor.Base == 0) {" ?
That can simplify the logic.
Thank you
Yao Jiewen
> -----Original Message-----
> From: edk2-devel [mailto:[email protected]] On Behalf Of
> Chasel, Chiu
> Sent: Friday, October 26, 2018 3:25 PM
> To: [email protected]
> Cc: Yao, Jiewen <[email protected]>
> Subject: [edk2] [PATCH] IntelFsp2Pkg: Fixed potentially NULL pointer
> accessing
>
> REF: https://bugzilla.tianocore.org/show_bug.cgi?id=1280
>
> When copying IDT table in SecMain, the pointer might be
> NULL so added the check to fix it.
>
> Test: Verified on internal platform and boots successfully.
>
> Cc: Jiewen Yao <[email protected]>
> Cc: Desimone Nathaniel L <[email protected]>
> Contributed-under: TianoCore Contribution Agreement 1.1
> Signed-off-by: Chasel Chiu <[email protected]>
> ---
> IntelFsp2Pkg/FspSecCore/SecMain.c | 8 +++++++-
> 1 file changed, 7 insertions(+), 1 deletion(-)
>
> diff --git a/IntelFsp2Pkg/FspSecCore/SecMain.c
> b/IntelFsp2Pkg/FspSecCore/SecMain.c
> index f319c68cc5..aed8893ff0 100644
> --- a/IntelFsp2Pkg/FspSecCore/SecMain.c
> +++ b/IntelFsp2Pkg/FspSecCore/SecMain.c
> @@ -113,8 +113,14 @@ SecStartup (
> // ERROR: IDT table size from boot loader is larger than FSP can
> support, DeadLoop here!
> //
> CpuDeadLoop();
> + } else if (IdtDescriptor.Base == 0) {
> + //
> + // ERROR: IDT table Base should not be zero, DeadLoop here!
> + //
> + CpuDeadLoop();
> + } else {
> + CopyMem ((VOID *) (UINTN) &IdtTableInStack.IdtTable, (VOID *)
> IdtDescriptor.Base, IdtSize);
> }
> - CopyMem ((VOID *) (UINTN) &IdtTableInStack.IdtTable, (VOID *)
> IdtDescriptor.Base, IdtSize);
> }
> IdtDescriptor.Base = (UINTN) &IdtTableInStack.IdtTable;
> IdtDescriptor.Limit = (UINT16)(IdtSize - 1);
> --
> 2.13.3.windows.1
>
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