[tfaber] 64689: [EVENTLOG] - In ElfGetLogHandleEntryByHandle, actually verify the validity of the handle by traversing the log handle list. Fixes crash in advapi32_winetest:eventlog (double close)....

Author: tfaber
Date: Sun Oct 12 11:23:05 2014
New Revision: 64689

URL: http://svn.reactos.org/svn/reactos?rev=64689&view=rev
Log:
[EVENTLOG]
- In ElfGetLogHandleEntryByHandle, actually verify the validity of the handle by
traversing the log handle list. Fixes crash in advapi32_winetest:eventlog (double close).
- Minor style improvements to ElfDeleteEventLogHandle
CORE-8621 #resolve

Modified:
    trunk/reactos/base/services/eventlog/rpc.c

Modified: trunk/reactos/base/services/eventlog/rpc.c
URL:
http://svn.reactos.org/svn/reactos/trunk/reactos/base/services/eventlog/rpc…
==============================================================================
--- trunk/reactos/base/services/eventlog/rpc.c	[iso-8859-1] (original)
+++ trunk/reactos/base/services/eventlog/rpc.c	[iso-8859-1] Sun Oct 12 11:23:05 2014
@@ -196,31 +196,40 @@
 
 PLOGHANDLE ElfGetLogHandleEntryByHandle(IELF_HANDLE EventLogHandle)
 {
+    PLIST_ENTRY CurrentEntry;
     PLOGHANDLE lpLogHandle;
 
-    if (IsListEmpty(&LogHandleListHead))
-    {
-        return NULL;
-    }
-
-    lpLogHandle = CONTAINING_RECORD((PLOGHANDLE)EventLogHandle, LOGHANDLE,
LogHandleListEntry);
-
-    return lpLogHandle;
+    CurrentEntry = LogHandleListHead.Flink;
+    while (CurrentEntry != &LogHandleListHead)
+    {
+        lpLogHandle = CONTAINING_RECORD(CurrentEntry,
+                                        LOGHANDLE,
+                                        LogHandleListEntry);
+        CurrentEntry = CurrentEntry->Flink;
+
+        if (lpLogHandle == EventLogHandle)
+            return lpLogHandle;
+    }
+
+    return NULL;
 }
 
 
 static NTSTATUS
-ElfDeleteEventLogHandle(IELF_HANDLE EventLogHandle)
-{
-    PLOGHANDLE lpLogHandle = (PLOGHANDLE)EventLogHandle;
-
-    if (!ElfGetLogHandleEntryByHandle(lpLogHandle))
+ElfDeleteEventLogHandle(IELF_HANDLE LogHandle)
+{
+    PLOGHANDLE lpLogHandle;
+
+    lpLogHandle = ElfGetLogHandleEntryByHandle(LogHandle);
+    if (!lpLogHandle)
+    {
         return STATUS_INVALID_HANDLE;
+    }
 
     RemoveEntryList(&lpLogHandle->LogHandleListEntry);
     LogfClose(lpLogHandle->LogFile, FALSE);
 
-    HeapFree(GetProcessHeap(),0,lpLogHandle);
+    HeapFree(GetProcessHeap(), 0, lpLogHandle);
 
     return STATUS_SUCCESS;
 }