[Bug 37669] Resetting a write watch can cause memory access violation in kernel

[wine-bugs at winehq.org]

https://bugs.winehq.org/show_bug.cgi?id=37669

--- Comment #10 from Sebastian Lackner <sebastian at fds-team.de> ---
(In reply to Dmitry Timoshkov from comment #8)
> That's a minor problem IMHO, any other async operation or operation
> on a memory buffer that may be invalidated by another thread while
> the operation is in progress can cause this kind of a problem. But
> that situation should be found and analyzed first. The SEH handler
> just hides the bug and may lead to hardly diagnosabe bugs. It would be
> better IMO let it crash instead of silently eating an exception. Anyway
> that would qualify as an application bug IMHO.

I don't agree, it could cause regressions. At the moment recvmsg just fails
with EFAULT, but when you replace that with your suggested solution it will
crash. As mentioned before, on Windows passing invalid pointers to WSA
functions doesn't cause an exception.

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