[ekohl] 53214: [ADVAPI32] Fix and EnumDependentServices[A/W]: - If lpServices is NULL or cbBufSize is less than sizeof(ENUM_SERVICE_STATUS/W) pass a pointer to an internal status buffer to REnumDep...

Author: ekohl
Date: Sat Aug 13 20:49:55 2011
New Revision: 53214

URL: http://svn.reactos.org/svn/reactos?rev=53214&view=rev
Log:
[ADVAPI32]
Fix and EnumDependentServices[A/W]:
- If lpServices is NULL or cbBufSize is less than sizeof(ENUM_SERVICE_STATUS/W) pass a
pointer to an internal status buffer to REnumDependentServicesA/W.

Modified:
    trunk/reactos/dll/win32/advapi32/service/scm.c

Modified: trunk/reactos/dll/win32/advapi32/service/scm.c
URL:
http://svn.reactos.org/svn/reactos/trunk/reactos/dll/win32/advapi32/service…
==============================================================================
--- trunk/reactos/dll/win32/advapi32/service/scm.c [iso-8859-1] (original)
+++ trunk/reactos/dll/win32/advapi32/service/scm.c [iso-8859-1] Sat Aug 13 20:49:55 2011
@@ -744,18 +744,31 @@
                        LPDWORD pcbBytesNeeded,
                        LPDWORD lpServicesReturned)
 {
+    ENUM_SERVICE_STATUSA ServiceStatus;
     LPENUM_SERVICE_STATUSA lpStatusPtr;
+    DWORD dwBufferSize;
     DWORD dwError;
     DWORD dwCount;
 
-    TRACE("EnumServicesStatusA() called\n");
+    TRACE("EnumDependentServicesA() called\n");
+
+    if (lpServices == NULL || cbBufSize < sizeof(ENUM_SERVICE_STATUSA))
+    {
+        lpStatusPtr = &ServiceStatus;
+        dwBufferSize = sizeof(ENUM_SERVICE_STATUSA);
+    }
+    else
+    {
+        lpStatusPtr = lpServices;
+        dwBufferSize = cbBufSize;
+    }
 
     RpcTryExcept
     {
         dwError = REnumDependentServicesA((SC_RPC_HANDLE)hService,
                                           dwServiceState,
-                                          (LPBYTE)lpServices,
-                                          cbBufSize,
+                                          (LPBYTE)lpStatusPtr,
+                                          dwBufferSize,
                                           pcbBytesNeeded,
                                           lpServicesReturned);
     }
@@ -767,18 +780,20 @@
 
     if (dwError == ERROR_SUCCESS || dwError == ERROR_MORE_DATA)
     {
-        lpStatusPtr = (LPENUM_SERVICE_STATUSA)lpServices;
-        for (dwCount = 0; dwCount < *lpServicesReturned; dwCount++)
+        if (*lpServicesReturned > 0)
         {
-            if (lpStatusPtr->lpServiceName)
-                lpStatusPtr->lpServiceName =
-                    (LPSTR)((ULONG_PTR)lpServices +
(ULONG_PTR)lpStatusPtr->lpServiceName);
-
-            if (lpStatusPtr->lpDisplayName)
-                lpStatusPtr->lpDisplayName =
-                    (LPSTR)((ULONG_PTR)lpServices +
(ULONG_PTR)lpStatusPtr->lpDisplayName);
-
-            lpStatusPtr++;
+            for (dwCount = 0; dwCount < *lpServicesReturned; dwCount++)
+            {
+                if (lpStatusPtr->lpServiceName)
+                    lpStatusPtr->lpServiceName =
+                        (LPSTR)((ULONG_PTR)lpServices +
(ULONG_PTR)lpStatusPtr->lpServiceName);
+
+                if (lpStatusPtr->lpDisplayName)
+                    lpStatusPtr->lpDisplayName =
+                        (LPSTR)((ULONG_PTR)lpServices +
(ULONG_PTR)lpStatusPtr->lpDisplayName);
+
+                lpStatusPtr++;
+            }
         }
     }
 
@@ -808,18 +823,31 @@
                        LPDWORD pcbBytesNeeded,
                        LPDWORD lpServicesReturned)
 {
+    ENUM_SERVICE_STATUSW ServiceStatus;
     LPENUM_SERVICE_STATUSW lpStatusPtr;
+    DWORD dwBufferSize;
     DWORD dwError;
     DWORD dwCount;
 
-    TRACE("EnumServicesStatusW() called\n");
+    TRACE("EnumDependentServicesW() called\n");
+
+    if (lpServices == NULL || cbBufSize < sizeof(ENUM_SERVICE_STATUSW))
+    {
+        lpStatusPtr = &ServiceStatus;
+        dwBufferSize = sizeof(ENUM_SERVICE_STATUSW);
+    }
+    else
+    {
+        lpStatusPtr = lpServices;
+        dwBufferSize = cbBufSize;
+    }
 
     RpcTryExcept
     {
         dwError = REnumDependentServicesW((SC_RPC_HANDLE)hService,
                                           dwServiceState,
-                                          (LPBYTE)lpServices,
-                                          cbBufSize,
+                                          (LPBYTE)lpStatusPtr,
+                                          dwBufferSize,
                                           pcbBytesNeeded,
                                           lpServicesReturned);
     }
@@ -831,18 +859,20 @@
 
     if (dwError == ERROR_SUCCESS || dwError == ERROR_MORE_DATA)
     {
-        lpStatusPtr = (LPENUM_SERVICE_STATUSW)lpServices;
-        for (dwCount = 0; dwCount < *lpServicesReturned; dwCount++)
+        if (*lpServicesReturned > 0)
         {
-            if (lpStatusPtr->lpServiceName)
-                lpStatusPtr->lpServiceName =
-                    (LPWSTR)((ULONG_PTR)lpServices +
(ULONG_PTR)lpStatusPtr->lpServiceName);
-
-            if (lpStatusPtr->lpDisplayName)
-                lpStatusPtr->lpDisplayName =
-                    (LPWSTR)((ULONG_PTR)lpServices +
(ULONG_PTR)lpStatusPtr->lpDisplayName);
-
-            lpStatusPtr++;
+            for (dwCount = 0; dwCount < *lpServicesReturned; dwCount++)
+            {
+                if (lpStatusPtr->lpServiceName)
+                    lpStatusPtr->lpServiceName =
+                        (LPWSTR)((ULONG_PTR)lpServices +
(ULONG_PTR)lpStatusPtr->lpServiceName);
+
+                if (lpStatusPtr->lpDisplayName)
+                    lpStatusPtr->lpDisplayName =
+                        (LPWSTR)((ULONG_PTR)lpServices +
(ULONG_PTR)lpStatusPtr->lpDisplayName);
+
+                lpStatusPtr++;
+            }
         }
     }