Mallicious code may use SmmFaultTolerantWriteHandler() to update some flash area directly, like Variable region, so return EFI_ACCESS_DENIED after End Of Dxe in SmmFaultTolerantWriteHandler().
And add code to prevent InfoSize overflow.

Signed-off-by: Star Zeng <star.zeng@intel.com>
Reviewed-by: Jiewen Yao <jiewen.yao@intel.com>

git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@14312 6f19259b-4bc3-4df7-8a09-765794883524