[edk2-devel] [PATCH 1/1] UefiCpuPkg/PiSmmCpuDxeSmm: Add check for pointer Pml5Entry
Laszlo Ersek
lersek at redhat.com
Wed Jul 31 11:28:55 UTC 2019
On 07/31/19 07:56, Shenglei Zhang wrote:
> The pointer Pml5Entry, returned from call to function
> AllocatePageTableMemory, may be null.
> So add check for it.
>
> Cc: Eric Dong <eric.dong at intel.com>
> Cc: Ray Ni <ray.ni at intel.com>
> Cc: Laszlo Ersek <lersek at redhat.com>
> Signed-off-by: Shenglei Zhang <shenglei.zhang at intel.com>
> ---
> UefiCpuPkg/PiSmmCpuDxeSmm/X64/PageTbl.c | 1 +
> 1 file changed, 1 insertion(+)
>
> diff --git a/UefiCpuPkg/PiSmmCpuDxeSmm/X64/PageTbl.c b/UefiCpuPkg/PiSmmCpuDxeSmm/X64/PageTbl.c
> index a3b62f778741..d7af3b6d7941 100644
> --- a/UefiCpuPkg/PiSmmCpuDxeSmm/X64/PageTbl.c
> +++ b/UefiCpuPkg/PiSmmCpuDxeSmm/X64/PageTbl.c
> @@ -375,6 +375,7 @@ SmmInitPageTable (
> // Fill PML5 entry
> //
> Pml5Entry = (UINT64*)AllocatePageTableMemory (1);
> + ASSERT (Pml5Entry != NULL);
> *Pml5Entry = (UINTN) Pml4Entry | mAddressEncMask | PAGE_ATTRIBUTE_BITS;
> ZeroMem (Pml5Entry + 1, EFI_PAGE_SIZE - sizeof (*Pml5Entry));
> //
>
I'm quite unhappy about this *pattern* in "PageTbl.c", but I must agree
that this patch at least makes the new 5-level paging code consistent
with the pattern.
Laszlo
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