https://bugzilla.tianocore.org/show_bug.cgi?id=1503 A pointer variable should be checked if it is NULL or Valid before using it. Cc: Chao Zhang <chao.b.zhang@intel.com> Cc: Jiewen Yao <jiewen.yao@intel.com> Contributed-under: TianoCore Contribution Agreement 1.1 Signed-off-by: Maggie Chu <maggie.chu@intel.com> Reviewed-by: Eric Dong <eric.dong@intel.com>