From e35b53179454119ba0d8591ccdfee9f0efe5fd77 Mon Sep 17 00:00:00 2001
From: jcarsey <jcarsey@6f19259b-4bc3-4df7-8a09-765794883524>
Date: Mon, 28 Mar 2011 21:49:17 +0000
Subject: prevents "" from being the result of trying to open the root of a
 drive. more input validation on vol command.

git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@11444 6f19259b-4bc3-4df7-8a09-765794883524
---
 ShellPkg/Application/Shell/ShellProtocol.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

(limited to 'ShellPkg/Application/Shell')

diff --git a/ShellPkg/Application/Shell/ShellProtocol.c b/ShellPkg/Application/Shell/ShellProtocol.c
index e2da5d37ad..2d587ea03b 100644
--- a/ShellPkg/Application/Shell/ShellProtocol.c
+++ b/ShellPkg/Application/Shell/ShellProtocol.c
@@ -585,7 +585,11 @@ EfiShellGetDevicePathFromFilePath(
   //
   // build the full device path
   //
-  DevicePathForReturn = FileDevicePath(Handle, Path+StrLen(MapName)+1);
+  if (*(Path+StrLen(MapName)+1) == CHAR_NULL) {
+    DevicePathForReturn = FileDevicePath(Handle, L"\\");
+  } else {
+    DevicePathForReturn = FileDevicePath(Handle, Path+StrLen(MapName)+1);
+  }
 
   FreePool(MapName);
   if (DevicePathCopyForFree != NULL) {
-- 
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