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The StrnLenS and AsciiStrnLenS functions, when presented with a string with no terminating NULL in the first MaxSize characters will check the character at String[MaxSize] before checking if Length < MaxSize. (They return the correct value, but have accessed beyond the stated limit in the process.) Flip the order of the tests to prevent this behaviour. Contributed-under: TianoCore Contribution Agreement 1.0 Signed-off-by: Leif Lindholm <leif.lindholm@linaro.org> Reviewed-by: Jiewen Yao <jiewen.yao@intel.com> Reviewed-by: Liming Gao <liming.gao@intel.com> git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@17936 6f19259b-4bc3-4df7-8a09-765794883524