[PATCH v2 2/6] MdePkg/BaseLib: Add an additional check within (Ascii)StrnCmp

[Hao Wu <hao.a.wu@intel.com>]

This commit adds an addtional check in AsciiStrnCmp and StrnCmp. It
explicitly checks the end of the sting pointed by 'SecondString' to make
the code logic easier for reading and to prevent possible mis-reports by
static code checkers.

Cc: Jiewen Yao <jiewen.yao@intel.com>
Cc: Liming Gao <liming.gao@intel.com>
Cc: Michael D Kinney <michael.d.kinney@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Hao Wu <hao.a.wu@intel.com>
Reviewed-by: Michael Kinney <michael.d.kinney@intel.com>
---
 MdePkg/Library/BaseLib/String.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/MdePkg/Library/BaseLib/String.c b/MdePkg/Library/BaseLib/String.c
index 25962f8..fa96d1c 100644
--- a/MdePkg/Library/BaseLib/String.c
+++ b/MdePkg/Library/BaseLib/String.c
@@ -1,7 +1,7 @@
 /** @file
   Unicode and ASCII string primitives.
 
-  Copyright (c) 2006 - 2014, Intel Corporation. All rights reserved.<BR>
+  Copyright (c) 2006 - 2016, Intel Corporation. All rights reserved.<BR>
   This program and the accompanying materials
   are licensed and made available under the terms and conditions of the BSD License
   which accompanies this distribution.  The full text of the license may be found at
@@ -315,6 +315,7 @@ StrnCmp (
   }
 
   while ((*FirstString != L'\0') &&
+         (*SecondString != L'\0') &&
          (*FirstString == *SecondString) &&
          (Length > 1)) {
     FirstString++;
@@ -1474,6 +1475,7 @@ AsciiStrnCmp (
   }
 
   while ((*FirstString != '\0') &&
+         (*SecondString != '\0') &&
          (*FirstString == *SecondString) &&
          (Length > 1)) {
     FirstString++;
-- 
1.9.5.msysgit.0