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netinet6: require network epoch for in6_pcbconnect()
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Authored by glebius on Feb 2 2023, 8:14 PM.
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Details

Summary

This removes recursive epoch entry in the syncache case. Fixes
unprotected access to V_in6_ifaddrhead in in6_pcbladdr(), as
well as access to prison IP address lists. It also matches what
IPv4 in_pcbconnect() does.

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rG FreeBSD src repository
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Buildable 49488
Build 46378: arc lint + arc unit