guard SetConsoleInputExeNameW() with SEH to properly release the console lock in case of failure

reactos/lib/kernel32/misc

diff -u -r1.86 -r1.87
--- console.c	18 Dec 2004 13:26:57 -0000	1.86
+++ console.c	18 Dec 2004 13:33:09 -0000	1.87
@@ -1,4 +1,4 @@

-/* $Id: console.c,v 1.86 2004/12/18 13:26:57 weiden Exp $

+/* $Id: console.c,v 1.87 2004/12/18 13:33:09 weiden Exp $

  *
  * COPYRIGHT:       See COPYING in the top level directory
  * PROJECT:         ReactOS system libraries

@@ -3422,6 +3422,7 @@

 BOOL STDCALL
 SetConsoleInputExeNameW(LPCWSTR lpInputExeName)
 {

+  BOOL Ret = FALSE;

   int lenName = lstrlenW(lpInputExeName);
 
   if(lenName < 1 ||

@@ -3433,11 +3434,25 @@

   }
   
   RtlEnterCriticalSection(&ConsoleLock);

-  RtlCopyMemory(InputExeName, lpInputExeName, lenName * sizeof(WCHAR));
-  InputExeName[lenName] = L'\0';

+  /* wrap copying into SEH as we may copy from invalid buffer and in case of an
+     exception the console lock would've never been released, which would cause
+     further calls (if the exception was handled by the caller) to recursively
+     acquire the lock... */
+  _SEH_TRY
+  {
+    RtlCopyMemory(InputExeName, lpInputExeName, lenName * sizeof(WCHAR));
+    InputExeName[lenName] = L'\0';
+    Ret = TRUE;
+  }
+  _SEH_HANDLE
+  {
+    lenName = 0;
+    SetLastErrorByStatus(_SEH_GetExceptionCode());
+  }
+  _SEH_END;

   RtlLeaveCriticalSection(&ConsoleLock);
   

-  return TRUE;

+  return Ret;

 }