Re: [PATCH v2 0/1] MR9858: qasf: Fix use-after-free of filter in reader callback.

[Elizabeth Figura (＠zfigura)]

```
    qasf: Fix use-after-free of asf reader in reader callback.
    
    If a asf reader callback is invoked after its corresponding reader has been
    destroyed, it will still try to use the reader via asf_callback->filter,
    resulting in use-after-free.
    
    This commits sets asf_callback->filter to NULL when the reader is destroyed,
    and adds NULL checks to reader callback functions to make them no-op after
    the reader is destroyed.
```

It doesn't sound right that wmvcore is invoking callbacks after (or while) the wmv object is destroyed. Are we sure that's supposed to happen?

```
    Fixes: Bug 59159
```

That's not how we write that.

-- 
https://gitlab.winehq.org/wine/wine/-/merge_requests/9858#note_126476