[Bug 49643] New: Calling ClipCursor too frequently can cause stack overflow in foreground window thread.

[WineHQ Bugzilla]

https://bugs.winehq.org/show_bug.cgi?id=49643

            Bug ID: 49643
           Summary: Calling ClipCursor too frequently can cause stack
                    overflow in foreground window thread.
           Product: Wine
           Version: 5.13
          Hardware: x86
                OS: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: winex11.drv
          Assignee: wine-bugs at winehq.org
          Reporter: rbernon at codeweavers.com
      Distribution: ---

Created attachment 67845
  --> https://bugs.winehq.org/attachment.cgi?id=67845
Reproducing sample application

Calling ClipCursor too frequently in a non-foreground thread may cause the
foreground window thread to overflow its stack. This is happening under some
circumstances with CoD: WWII.

This is inherent to the current implementation where every ClipCursor request
from a non-foreground thread involves synchronously sending internal messages
to the foreground window thread, then to the desktop thread. Each ClipCursor
request is processed when the desktop thread is notified, growing the stack
every time, until it overflows.

The attached program can be used to easily reproduce the issue.

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