[hpoussin] 21789: Cleanup in SetupGetInfFileListW: - Better arguments check - Rename pFileSpecification to pFullFileName - Fix some possible buffer overflows spotted by w3seek

Author: hpoussin
Date: Wed May  3 18:26:43 2006
New Revision: 21789

URL: http://svn.reactos.ru/svn/reactos?rev=21789&view=rev
Log:
Cleanup in SetupGetInfFileListW:
- Better arguments check
- Rename pFileSpecification to pFullFileName
- Fix some possible buffer overflows spotted by w3seek

Modified:
    trunk/reactos/dll/win32/setupapi/parser.c

Modified: trunk/reactos/dll/win32/setupapi/parser.c
URL: http://svn.reactos.ru/svn/reactos/trunk/reactos/dll/win32/setupapi/parser.c?...
==============================================================================
--- trunk/reactos/dll/win32/setupapi/parser.c (original)
+++ trunk/reactos/dll/win32/setupapi/parser.c Wed May  3 18:26:43 2006
@@ -2,7 +2,7 @@
  * INF file parsing
  *
  * Copyright 2002 Alexandre Julliard for CodeWeavers
- *           2005 Hervé Poussineau ([e-mail])
+ *           2005-2006 Hervé Poussineau ([e-mail])
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Lesser General Public
@@ -1968,8 +1968,8 @@
     OUT PDWORD RequiredSize OPTIONAL)
 {
     HANDLE hSearch;
-    LPWSTR pFileSpecification = NULL;
-    LPWSTR pFileName; /* Pointer into pFileSpecification buffer */
+    LPWSTR pFullFileName = NULL;
+    LPWSTR pFileName; /* Pointer into pFullFileName buffer */
     LPWSTR pBuffer = ReturnBuffer;
     WIN32_FIND_DATAW wfdFileInfo;
     size_t len;
@@ -1985,38 +1985,55 @@
         SetLastError(ERROR_INVALID_PARAMETER);
         goto cleanup;
     }
+    else if (ReturnBufferSize == 0 && ReturnBuffer != NULL)
+    {
+        SetLastError(ERROR_INVALID_PARAMETER);
+        goto cleanup;
+    }
+    else if (ReturnBufferSize > 0 && ReturnBuffer == NULL)
+    {
+        SetLastError(ERROR_INVALID_PARAMETER);
+        goto cleanup;
+    }

/* Allocate memory for file filter */
-    len = DirectoryPath ? strlenW(DirectoryPath) : MAX_PATH;
-    pFileSpecification = MyMalloc(
-            (len + 1 + strlenW(InfFileSpecification) + 1) * sizeof(WCHAR));
-    if (!pFileSpecification)
+    if (DirectoryPath != NULL)
+        /* "DirectoryPath*.inf" form */
+        len = strlenW(DirectoryPath) + 1 + strlenW(InfFileSpecification) + 1;
+    else
+        /* "%WINDIR%\Inf*.inf" form */
+        len = MAX_PATH + 1 + strlenW(InfDirectory) + strlenW(InfFileSpecification) + 1;
+    pFullFileName = MyMalloc(len * sizeof(WCHAR));
+    if (pFullFileName == NULL)
     {
         SetLastError(ERROR_NOT_ENOUGH_MEMORY);
         goto cleanup;
     }
+
+    /* Fill file filter buffer */
     if (DirectoryPath)
     {
-        strcpyW(pFileSpecification, DirectoryPath);
-        if (pFileSpecification[strlenW(pFileSpecification)] != '\')
-            strcatW(pFileSpecification, BackSlash);
+        strcpyW(pFullFileName, DirectoryPath);
+        if (pFullFileName[strlenW(pFullFileName) - 1] != '\')
+            strcatW(pFullFileName, BackSlash);
     }
     else
     {
-        if (GetSystemWindowsDirectoryW(pFileSpecification, MAX_PATH) == 0)
+        len = GetSystemWindowsDirectoryW(pFullFileName, MAX_PATH);
+        if (len == 0 || len > MAX_PATH)
             goto cleanup;
-        if (pFileSpecification[strlenW(pFileSpecification)] != '\')
-            strcatW(pFileSpecification, BackSlash);
-        strcatW(pFileSpecification, InfDirectory);
-    }
-    pFileName = &pFileSpecification[strlenW(pFileSpecification)];
+        if (pFullFileName[strlenW(pFullFileName) - 1] != '\')
+            strcatW(pFullFileName, BackSlash);
+        strcatW(pFullFileName, InfDirectory);
+    }
+    pFileName = &pFullFileName[strlenW(pFullFileName)];

/* Search for the first file */
     strcpyW(pFileName, InfFileSpecification);
-    hSearch = FindFirstFileW(pFileSpecification, &wfdFileInfo);
+    hSearch = FindFirstFileW(pFullFileName, &wfdFileInfo);
     if (hSearch == INVALID_HANDLE_VALUE)
     {
-        TRACE("No file returned by %s\n", debugstr_w(pFileSpecification));
+        TRACE("No file returned by %s\n", debugstr_w(pFullFileName));
         goto cleanup;
     }

@@ -2026,7 +2043,7 @@

strcpyW(pFileName, wfdFileInfo.cFileName);
         hInf = SetupOpenInfFileW(
-            pFileSpecification,
+            pFullFileName,
             NULL, /* Inf class */
             InfStyle,
             NULL /* Error line */);
@@ -2037,7 +2054,7 @@
                 /* InfStyle was not correct. Skip this file */
                 continue;
             }
-            TRACE("Invalid .inf file %s\n", debugstr_w(pFileSpecification));
+            TRACE("Invalid .inf file %s\n", debugstr_w(pFullFileName));
             continue;
         }

@@ -2067,7 +2084,7 @@
         *RequiredSize = requiredSize;

cleanup:
-    MyFree(pFileSpecification);
+    MyFree(pFullFileName);
     return ret;
 }