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If a BaseAddress of NULL is passed into DXE Core services CoreAllocateIoSpace() or CoreAllocateMemorySpace(), and DEBUG() messages are enabled, then a NULL pointer reference is made. The parameter check for BaseAddress is performed in the function CoreAllocateSpace() after the DEBUG() messages. A check is added in the DEBUG() messages to prevent the NULL pointer reference. This issue was found with PI SCTs with DEBUG messages enabled in the DXE Core. Cc: Feng Tian <feng.tian@intel.com> Cc: Star Zeng <star.zeng@intel.com> Contributed-under: TianoCore Contribution Agreement 1.0 Signed-off-by: Michael Kinney <michael.d.kinney@intel.com> Reviewed-by: Star Zeng <star.zeng@intel.com> Reviewed-by: Feng Tian <feng.tian@Intel.com> Reviewed-by: Liming Gao <liming.gao@intel.com>