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The input param String of AsciiStrStr() requires a pointer to Null-terminated string, however in HttpUtilitiesParse(), the Buffersize before AllocateZeroPool() is equal to the size of TCP header, after the CopyMem(), it might not end with Null-terminator. It might cause memory access overflow. Cc: Fu Siyuan <siyuan.fu@intel.com> Cc: Wu Jiaxin <jiaxin.wu@intel.com> Ref: https://bugzilla.tianocore.org/show_bug.cgi?id=1204 Contributed-under: TianoCore Contribution Agreement 1.1 Signed-off-by: Songpeng Li <songpeng.li@intel.com> Reviewed-by: Fu Siyuan <siyuan.fu@intel.com>