From 6bdda5357fcfa7a4362ae3a639f95b604f30647a Mon Sep 17 00:00:00 2001
From: Timo Kreuzer <timo.kreuzer@reactos.org>
Date: Sun, 17 May 2009 21:51:31 +0000
Subject: [PATCH] MmGrowKernelStack: Don't assert, but fail, when the kernel
 stack can't grow any more. Fixes a crash with recursive user calls. See issue
 #4060 for more details.

svn path=/trunk/; revision=40963
---
 reactos/ntoskrnl/mm/procsup.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/reactos/ntoskrnl/mm/procsup.c b/reactos/ntoskrnl/mm/procsup.c
index 91c2499d648..4a04c797a13 100644
--- a/reactos/ntoskrnl/mm/procsup.c
+++ b/reactos/ntoskrnl/mm/procsup.c
@@ -259,8 +259,11 @@ MmGrowKernelStack(PVOID StackPointer)
     PETHREAD Thread = PsGetCurrentThread();
 
     /* Make sure we have reserved space for our grow */
-    ASSERT(((PCHAR)Thread->Tcb.StackBase - (PCHAR)Thread->Tcb.StackLimit) <=
-           (KERNEL_LARGE_STACK_SIZE + PAGE_SIZE));
+    if (((PCHAR)Thread->Tcb.StackBase - (PCHAR)Thread->Tcb.StackLimit) >
+           (KERNEL_LARGE_STACK_SIZE + PAGE_SIZE))
+    {
+        return STATUS_NO_MEMORY;
+    }
 
     /*
      * We'll give you three more pages.