New subject: [Bug 53795] Emojis crash Naver LINE (and possibly all Qt applications)

15 Oct 2022


      https://bugs.winehq.org/show_bug.cgi?id=53795
Bug ID: 53795
           Summary: Emojis crash Naver LINE (and possibly all Qt
                    applications)
           Product: Wine
           Version: 7.19
          Hardware: x86-64
                OS: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: gdi32
          Assignee: wine-bugs@winehq.org
          Reporter: pq2sx44teeigl7za@chyen.cc
      Distribution: ---
Created attachment 73289
  --> https://bugs.winehq.org/attachment.cgi?id=73289
Source of a trivial Qt application to reproduce the issue
Naver LINE (installer at [1]) crashes if I paste some kinds of emojis, like 
???? (U+1F972) or ???? (U+1F970). Crashes happen with all kinds of text boxes,
including username in the login dialog, search box and messaging dialog. Crash
does not happen if I uninstalled the Noto Color Emoji font [2].
Without WINEDEBUG, crashes are intermittent. With WINEDEBUG=+font, I always get
crashes.
The issue can be reproduced with a trivial Qt application (source attached).
The backtrace from a Qt 5.12.12 MinGW debug build [3] is also attached.
From the backtrace, Qt crashes when trying to get the string from
otm->otmpFullName [4]. In a gdb session, the address (otm + otm->otmpFullName)
points to an invalid address (needs to add otm per [5]). Apparently
GetOutlineTextMetrics does not correctly assign that pointer.
[1] https://desktop.line-scdn.net/win/new/LineInst.exe
[2] https://archlinux.org/packages/extra/any/noto-fonts-emoji/
[3]
https://download.qt.io/archive/qt/5.12/5.12.12/qt-opensource-windows-x86-5.1...
[4]
https://github.com/qt/qtbase/blob/v5.12.12/src/platformsupport/fontdatabases...
[5]
https://learn.microsoft.com/en-us/windows/win32/api/wingdi/ns-wingdi-outline...
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[Bug 53795] New: Emojis crash Naver LINE (and possibly all Qt applications)