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https://bugzilla.tianocore.org/show_bug.cgi?id=307 For the following APIs in PrintLib instance MdeModulePkg\Library\DxePrintLibPrint2Protocol: UnicodeVSPrint UnicodeSPrint UnicodeVSPrintAsciiFormat UnicodeSPrintAsciiFormat AsciiVSPrint AsciiSPrint AsciiVSPrintUnicodeFormat AsciiSPrintUnicodeFormat The internal function DxePrintLibPrint2ProtocolVaListToBaseList() will be called to convert a VA_LIST to a BASE_LIST. However, those APIs miss checking the return value of the internal function. This commit adds codes to check the return value. If the VA_LIST fails to be converted to a BASE_LIST, those PrintLib APIs will return 0 and leave the output 'StartOfBuffer' unmodified. Contributed-under: TianoCore Contribution Agreement 1.0 Signed-off-by: Hao Wu <hao.a.wu@intel.com> Reviewed-by: Jiewen Yao <jiewen.yao@intel.com>