New subject: [Bug 46024] Qt applications crash after call to WTOpen without tablet hardware attached

20 Oct 2018


      https://bugs.winehq.org/show_bug.cgi?id=46024
Bug ID: 46024
           Summary: Qt applications crash after call to WTOpen without
                    tablet hardware attached
           Product: Wine
           Version: 3.13
          Hardware: x86
                OS: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: wintab32
          Assignee: wine-bugs@winehq.org
          Reporter: bernhardu@mailbox.org
      Distribution: ---
Was observed first in debian bug [1] with wine-3.13.
In my opinion WTInfo returns some uninitialized stack memory in LOGCONTEXTW.
Qt does not look at the return value at all and calls then WTOpen,
which puts some window messages near lcMsgBase into the message queue.
Most of the time this works as a random window message is just ignored.
But under some circumstances an existing wine internal window message is hit,
but that message needs parameters which are not given, therefore it is
crashing.
This happens when there is no device attached that is usable via wintab32.dll.
RFC patches and discussion in [1],[2].
[1] https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=905090
[2] https://www.winehq.org/pipermail/wine-devel/2018-September/132083.html
[3] https://www.winehq.org/pipermail/wine-devel/2018-October/133775.html
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[Bug 46024] New: Qt applications crash after call to WTOpen without tablet hardware attached