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netinet6: perform out-of-bounds check for lo0 multicast statitics
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Authored by melifaro on Jul 4 2022, 8:03 PM.
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Details

Summary

Currently, some per-mbuf multicast statistic is stored in per-interface ip6stat.ip6s_m2m[] array of size 32 (IP6S_M2MMAX).
Check that loopback ifindex falls within 0.. IP6S_M2MMAX-1 range to avoid silent data corruption.
the latter cat happen with large number of VNETs.

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rG FreeBSD src repository
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