Matt Caswell a227ff336f Fix a use-after-free in the child provider code
If the child provider context data gets cleaned up before all usage of
providers has finished then a use-after-free can occur. We change the
priority of this data so that it gets freed later.

Fixes #15284

Reviewed-by: Paul Dale <pauli@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/15286)
2021-05-17 10:36:03 +01:00
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