[Bug 199705] [patch] [geom] use-after-free bug in geli

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=199705

--- Comment #1 from Ed Maste <emaste at freebsd.org> ---
Testing now.

I believe this will in practice be rare - let me know if you agree:

> crypto_dispatch()
> returns EINVAL if its argument or the callback function was NULL, and 0
> otherwise.

So aside from bugs elsewhere, crypto_dispatch should only ever return 0, and
we'd need a race with another thread that sets bp->bio_error in order to cause
an issue.

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