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miibus: Use a bus_child_deleted method to free ivars for children
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Authored by jhb on Oct 31 2024, 8:36 PM.
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Summary

If a device was detached (e.g. via devctl) and then re-attached, the
ivars would be freed by the previous bus_child_detached method during
detach, but device_get_ivars during the subsequent attach would return
a stale pointer resulting in a use after free.

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