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REF: https://bugzilla.tianocore.org/show_bug.cgi?id=1266 af5e95215928e052445c473f1244412dadea8252 abstracted generic functions from different modules (IntelVTdDxe, S3SaveStateDxe, PcRtc, DpDynamicCommand and PiSmmCpuDxeSmm). Some of them (IntelVTdDxe and PcRtc) checked Table against NULL before accessing Table->Signature, some (S3SaveStateDxe, DpDynamicCommand and PiSmmCpuDxeSmm did not. The ScanTableInSDT() in Acpi.c of UefiLib was mainly from S3SaveStateDxe, so it does not check Table against NULL before accessing Table->Signature. This patch updates ScanTableInSDT() to check Table against NULL first before accessing Table->Signature. Cc: Liming Gao <liming.gao@intel.com> Cc: Michael D Kinney <michael.d.kinney@intel.com> Cc: Jian J Wang <jian.j.wang@intel.com> Contributed-under: TianoCore Contribution Agreement 1.1 Signed-off-by: Star Zeng <star.zeng@intel.com> Reviewed-by: Liming Gao <liming.gao@intel.com> Reviewed-by: Jian J Wang <jian.j.wang@intel.com>