Re: [PATCH] MdeModulePkg/PiSmmCore: fix mem alloc issues in heap guard

["Yao, Jiewen" <jiewen.yao@intel.com>]

Reviewed-by: Jiewen.yao@intelc.om

> -----Original Message-----
> From: Wang, Jian J
> Sent: Tuesday, March 13, 2018 4:34 PM
> To: edk2-devel@lists.01.org
> Cc: Zeng, Star <star.zeng@intel.com>; Dong, Eric <eric.dong@intel.com>; Yao,
> Jiewen <jiewen.yao@intel.com>
> Subject: [PATCH] MdeModulePkg/PiSmmCore: fix mem alloc issues in heap guard
> 
> This patch fixes the same issues in Heap Guard in DXE core, which is fixed
> in another patch.
> 
> Cc: Star Zeng <star.zeng@intel.com>
> Cc: Eric Dong <eric.dong@intel.com>
> Cc: Jiewen Yao <jiewen.yao@intel.com>
> Contributed-under: TianoCore Contribution Agreement 1.1
> Signed-off-by: Jian J Wang <jian.j.wang@intel.com>
> ---
>  MdeModulePkg/Core/PiSmmCore/HeapGuard.c | 8 ++++++--
>  1 file changed, 6 insertions(+), 2 deletions(-)
> 
> diff --git a/MdeModulePkg/Core/PiSmmCore/HeapGuard.c
> b/MdeModulePkg/Core/PiSmmCore/HeapGuard.c
> index aa9c25d102..923af93de2 100644
> --- a/MdeModulePkg/Core/PiSmmCore/HeapGuard.c
> +++ b/MdeModulePkg/Core/PiSmmCore/HeapGuard.c
> @@ -251,8 +251,8 @@ FindGuardedMemoryMap (
>    //
>    // Adjust current map table depth according to the address to access
>    //
> -  while (mMapLevel < GUARDED_HEAP_MAP_TABLE_DEPTH
> -         &&
> +  while (AllocMapUnit &&
> +         mMapLevel < GUARDED_HEAP_MAP_TABLE_DEPTH &&
>           RShiftU64 (
>             Address,
>             mLevelShift[GUARDED_HEAP_MAP_TABLE_DEPTH - mMapLevel -
> 1]
> @@ -887,6 +887,10 @@ AdjustMemoryS (
>    }
> 
>    Target = Start + Size - SizeRequested;
> +  ASSERT (Target >= Start);
> +  if (Target == 0) {
> +    return 0;
> +  }
> 
>    if (!IsGuardPage (Start + Size)) {
>      // No Guard at tail to share. One more page is needed.
> --
> 2.16.2.windows.1