[PATCH] MdePkg-BaseLib: PathCleanUpDirectories fix

[<Jim.Dailey@dell.com>]

PathCleanUpDirectories does not handle "<dir>\..\<file>" properly; it
returns "<dir>\<file>" instead of "<file>".  This change fixes that
problem so that "<file>" is returned.

Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Jim Dailey <jim_dailey@dell.com>
---
 MdePkg/Library/BaseLib/FilePaths.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/MdePkg/Library/BaseLib/FilePaths.c b/MdePkg/Library/BaseLib/FilePaths.c
index 92e4c350ff..69e46dd135 100644
--- a/MdePkg/Library/BaseLib/FilePaths.c
+++ b/MdePkg/Library/BaseLib/FilePaths.c
@@ -110,7 +110,12 @@ PathCleanUpDirectories(
          ((*(TempString + 3) == L'\\') || (*(TempString + 3) == CHAR_NULL))
         ) {
     *(TempString + 1) = CHAR_NULL;
-    PathRemoveLastItem(Path);
+    if (!PathRemoveLastItem(Path)) {
+      //
+      // We had "<somedir>\.."
+      //
+      *Path = CHAR_NULL;
+    }
     if (*(TempString + 3) != CHAR_NULL) {
       CopyMem (Path + StrLen (Path), TempString + 4, StrSize (TempString + 4));
     }
-- 
2.17.0.windows.1