From 446f263ed3a2c6143a9a2292359d3503c0857f46 Mon Sep 17 00:00:00 2001
From: David Welch <welch@cwcom.net>
Date: Tue, 24 Feb 2004 23:50:26 +0000
Subject: [PATCH] - Try to avoid crashing when dumping out a corrupted stack.

svn path=/trunk/; revision=8360
---
 reactos/ntoskrnl/ke/i386/exp.c | 16 ++++++++++++++--
 1 file changed, 14 insertions(+), 2 deletions(-)

diff --git a/reactos/ntoskrnl/ke/i386/exp.c b/reactos/ntoskrnl/ke/i386/exp.c
index 2afd69b345f..0645581eed6 100644
--- a/reactos/ntoskrnl/ke/i386/exp.c
+++ b/reactos/ntoskrnl/ke/i386/exp.c
@@ -500,8 +500,20 @@ KiDumpTrapFrame(PKTRAP_FRAME Tf, ULONG Parameter1, ULONG Parameter2)
    Frame = (PULONG)Tf->Ebp;
    while (Frame != NULL)
      {
-       print_address((PVOID)Frame[1]);
-       Frame = (PULONG)Frame[0];
+       NTSTATUS Status;
+       PVOID Eip;
+       Status = MmSafeCopyFromUser(&Eip, Frame + 1, sizeof(Eip));
+       if (!NT_SUCCESS(Status))
+	 {
+	   DbgPrint("<INVALID>");
+	   break;
+	 }
+       print_address(Eip);
+       Status = MmSafeCopyFromUser(&Frame, Frame, sizeof(Frame));
+       if (!NT_SUCCESS(Status))
+	 {
+	   break;
+	 }
        i++;
        DbgPrint(" ");
      }