From 64455e3b04559c229008adf23dbdcba07a5dcb60 Mon Sep 17 00:00:00 2001
From: Dmitry Chapyshev <dmitry@reactos.org>
Date: Fri, 6 Mar 2009 18:03:04 +0000
Subject: [PATCH] - Fix exceptions in some cases (if CriticalSection->DebugInfo
 = NULL)

svn path=/trunk/; revision=39891
---
 reactos/lib/rtl/critical.c | 15 +++++++++++----
 1 file changed, 11 insertions(+), 4 deletions(-)

diff --git a/reactos/lib/rtl/critical.c b/reactos/lib/rtl/critical.c
index da7314429a1..884a45c66d8 100644
--- a/reactos/lib/rtl/critical.c
+++ b/reactos/lib/rtl/critical.c
@@ -358,14 +358,21 @@ RtlDeleteCriticalSection(PRTL_CRITICAL_SECTION CriticalSection)
     /* Protect List */
     RtlEnterCriticalSection(&RtlCriticalSectionLock);
 
-    /* Remove it from the list */
-    RemoveEntryList(&CriticalSection->DebugInfo->ProcessLocksList);
+    if (CriticalSection->DebugInfo)
+    {
+        /* Remove it from the list */
+        RemoveEntryList(&CriticalSection->DebugInfo->ProcessLocksList);
+        RtlZeroMemory(CriticalSection->DebugInfo, sizeof(RTL_CRITICAL_SECTION_DEBUG));
+    }
 
     /* Unprotect */
     RtlLeaveCriticalSection(&RtlCriticalSectionLock);
 
-    /* Free it */
-    RtlpFreeDebugInfo(CriticalSection->DebugInfo);
+    if (CriticalSection->DebugInfo)
+    {
+        /* Free it */
+        RtlpFreeDebugInfo(CriticalSection->DebugInfo);
+    }
 
     /* Wipe it out */
     RtlZeroMemory(CriticalSection, sizeof(RTL_CRITICAL_SECTION));