[reactos] 01/03: [WIN32K:NTUSER] Add missing probe in NtUserGetClassName.

[Thomas Faber]

https://git.reactos.org/?p=reactos.git;a=commitdiff;h=be92be2e37dba65306077…

commit be92be2e37dba65306077bee26fa7ef92edaa6b6
Author:     Thomas Faber <thomas.faber(a)reactos.org>
AuthorDate: Sun Dec 29 16:14:17 2019 +0100
Commit:     Thomas Faber <thomas.faber(a)reactos.org>
CommitDate: Sun Dec 29 20:08:30 2019 +0100

    [WIN32K:NTUSER] Add missing probe in NtUserGetClassName.
---
 win32ss/user/ntuser/class.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/win32ss/user/ntuser/class.c b/win32ss/user/ntuser/class.c
index 83fe9009b34..d669340baf7 100644
--- a/win32ss/user/ntuser/class.c
+++ b/win32ss/user/ntuser/class.c
@@ -2815,6 +2815,12 @@ NtUserGetClassName (IN HWND hWnd,
         {
             ProbeForWriteUnicodeString(ClassName);
             CapturedClassName = *ClassName;
+            if (CapturedClassName.Length != 0)
+            {
+                ProbeForRead(CapturedClassName.Buffer,
+                             CapturedClassName.Length,
+                             sizeof(WCHAR));
+            }
 
             /* Get the class name */
             Ret = UserGetClassName(Window->pcls,