From 5f213e854036e475b2a38ffb9f7521ee1b2bb2a5 Mon Sep 17 00:00:00 2001
From: Qiu Shumin <shumin.qiu@intel.com>
Date: Fri, 8 Apr 2016 15:41:06 +0800
Subject: ShellPkg: Fix Shell ASSERT when mv file with cwd is NULL.

Shell will ASSERT when doing the following operation:
""
Shell> mv fs2:\file1 fs2:\file2
""
This patch add NULL pointer check to fix this issue.

Fixes: https://github.com/tianocore/edk2/issues/76

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Qiu Shumin <shumin.qiu@intel.com>
Reviewed-by: Jaben Carsey <jaben.carsey@intel.com>
Reviewed-by: Ruiyu Ni <ruiyu.ni@intel.com>
(cherry picked from commit 64ee6ed72ad5c1e4b7c9a96f419c3592e93314ad)
---
 ShellPkg/Library/UefiShellLevel2CommandsLib/Mv.c | 29 +++++++++++++-----------
 1 file changed, 16 insertions(+), 13 deletions(-)

(limited to 'ShellPkg/Library')

diff --git a/ShellPkg/Library/UefiShellLevel2CommandsLib/Mv.c b/ShellPkg/Library/UefiShellLevel2CommandsLib/Mv.c
index 29efb1c6fe..d02a6ae5f5 100644
--- a/ShellPkg/Library/UefiShellLevel2CommandsLib/Mv.c
+++ b/ShellPkg/Library/UefiShellLevel2CommandsLib/Mv.c
@@ -483,18 +483,21 @@ ValidateAndMoveFiles(
   Response          = *Resp;
   Attr              = 0;
   CleanFilePathStr  = NULL;
+  FullCwd           = NULL;
 
-  FullCwd = AllocateZeroPool(StrSize(Cwd) + sizeof(CHAR16));
-  if (FullCwd == NULL) {
-    return SHELL_OUT_OF_RESOURCES;
-  } else {
-    StrCpyS(FullCwd, StrSize(Cwd)/sizeof(CHAR16)+1, Cwd);
-    StrCatS(FullCwd, StrSize(Cwd)/sizeof(CHAR16)+1, L"\\");
-  }
+  if (Cwd != NULL) {
+    FullCwd = AllocateZeroPool(StrSize(Cwd) + sizeof(CHAR16));
+    if (FullCwd == NULL) {
+      return SHELL_OUT_OF_RESOURCES;
+    } else {
+      StrCpyS(FullCwd, StrSize(Cwd)/sizeof(CHAR16)+1, Cwd);
+      StrCatS(FullCwd, StrSize(Cwd)/sizeof(CHAR16)+1, L"\\");
+    }
+  } 
 
   Status = ShellLevel2StripQuotes (DestParameter, &CleanFilePathStr);
   if (EFI_ERROR (Status)) {
-    FreePool (FullCwd);
+    SHELL_FREE_NON_NULL(FullCwd);
     if (Status == EFI_OUT_OF_RESOURCES) {
       return SHELL_OUT_OF_RESOURCES;
     } else {
@@ -511,7 +514,7 @@ ValidateAndMoveFiles(
   FreePool (CleanFilePathStr);
 
   if (ShellStatus != SHELL_SUCCESS) {
-    FreePool (FullCwd);
+    SHELL_FREE_NON_NULL (FullCwd);
     return (ShellStatus);
   }
   DestPath = PathCleanUpDirectories(DestPath);
@@ -526,7 +529,7 @@ ValidateAndMoveFiles(
     SHELL_FREE_NON_NULL(DestPath);
     SHELL_FREE_NON_NULL(HiiOutput);
     SHELL_FREE_NON_NULL(HiiResultOk);
-    FreePool (FullCwd);
+    SHELL_FREE_NON_NULL(FullCwd);
     return (SHELL_OUT_OF_RESOURCES);
   }
 
@@ -588,7 +591,7 @@ ValidateAndMoveFiles(
           //
           // indicate to stop everything
           //
-          FreePool(FullCwd);
+          SHELL_FREE_NON_NULL(FullCwd);
           return (SHELL_ABORTED);
         case ShellPromptResponseAll:
           *Resp = Response;
@@ -599,7 +602,7 @@ ValidateAndMoveFiles(
           break;
         default:
           FreePool(Response);
-          FreePool(FullCwd);
+          SHELL_FREE_NON_NULL(FullCwd);
           return SHELL_ABORTED;
       }
       Status = ShellDeleteFileByName(FullDestPath!=NULL? FullDestPath:DestPath);
@@ -646,7 +649,7 @@ ValidateAndMoveFiles(
   SHELL_FREE_NON_NULL(DestPath);
   SHELL_FREE_NON_NULL(HiiOutput);
   SHELL_FREE_NON_NULL(HiiResultOk);
-  FreePool (FullCwd);
+  SHELL_FREE_NON_NULL(FullCwd);
   return (ShellStatus);
 }
 
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