Jiajin Cui : win32u: Don't allow a replaced font to be a replacement.

[Alexandre Julliard]

Module: wine
Branch: master
Commit: 53f6d82e69377a3f4f112275bbc61978946ad2a5
URL:    https://gitlab.winehq.org/wine/wine/-/commit/53f6d82e69377a3f4f112275bbc6197...

Author: Jiajin Cui <cuijiajin(a)uniontech.com>
Date:   Fri Aug 19 08:49:52 2022 +0800

win32u: Don't allow a replaced font to be a replacement.

This is to prevent replacement loops.

---

 dlls/win32u/font.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/dlls/win32u/font.c b/dlls/win32u/font.c
index e26c7bfa316..e281db9b0c8 100644
--- a/dlls/win32u/font.c
+++ b/dlls/win32u/font.c
@@ -903,6 +903,12 @@ static BOOL add_family_replacement( const WCHAR *new_name, const WCHAR *replace
         return FALSE;
     }
 
+    if (family->replacement)
+    {
+        TRACE( "%s is replaced by another font, skipping.\n", debugstr_w(replace) );
+        return FALSE;
+    }
+
     if (!(new_family = create_family( new_name, NULL ))) return FALSE;
     new_family->replacement = family;
     family->refcount++;