[PATCH v3 0/1] MR7925: gdi32: Limit source string length in logfont_AtoW (ASan).

[Alex Henrie (＠alexhenrie)]

test_logfont in dlls/gdi32/tests/font.c calls CreateFontIndirectA with a
non-null-terminated font name and expects it to not crash.

--
  v3: gdi32: Limit source string length in logfont_AtoW (ASan).

https://gitlab.winehq.org/wine/wine/-/merge_requests/7925

[PATCH v3 1/1] gdi32: Limit source string length in logfont_AtoW (ASan).

[Alex Henrie]

From: Alex Henrie

test_logfont in dlls/gdi32/tests/font.c calls CreateFontIndirectA with a
non-null-terminated font name and expects it to not crash.
---
 dlls/gdi32/text.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/dlls/gdi32/text.c b/dlls/gdi32/text.c
index 6be622a2312..070714a30c6 100644
--- a/dlls/gdi32/text.c
+++ b/dlls/gdi32/text.c
@@ -781,8 +781,9 @@ static void text_metric_ex_WtoA(const NEWTEXTMETRICEXW *tmW, NEWTEXTMETRICEXA *t
 static void logfont_AtoW( const LOGFONTA *fontA, LPLOGFONTW fontW )
 {
     memcpy( fontW, fontA, sizeof(LOGFONTA) - LF_FACESIZE );
-    MultiByteToWideChar( CP_ACP, 0, fontA->lfFaceName, -1, fontW->lfFaceName,
-                         LF_FACESIZE );
+    MultiByteToWideChar( CP_ACP, 0, fontA->lfFaceName,
+                         strnlen(fontA->lfFaceName, LF_FACESIZE - 1),
+                         fontW->lfFaceName, LF_FACESIZE - 1 );
     fontW->lfFaceName[LF_FACESIZE - 1] = 0;
 }