[Midnightbsd-cvs] [MidnightBSD/src] fde1af: Fix multicast source filter races

[Lucas Holt]

  Branch: refs/heads/stable/4.0
  Home:   https://github.com/MidnightBSD/src
  Commit: fde1affa64da0c64e7b58e3583f001446059930d
      https://github.com/MidnightBSD/src/commit/fde1affa64da0c64e7b58e3583f001446059930d
  Author: Lucas Holt <luke at foolishgames.com>
  Date:   2026-06-10 (Wed, 10 Jun 2026)

  Changed paths:
    M sys/netinet/in_mcast.c
    M sys/netinet6/in6_mcast.c

  Log Message:
  -----------
  Fix multicast source filter races

Copy source filter arrays before operating on socket multicast state so IP_MSFILTER and IPV6_MSFILTER do not drop the INP lock while holding pointers into mutable membership data.

This ports the FreeBSD SA-26:29 ip6_multicast fix pattern for CVE-2026-49412.

AI-Assisted-by: Codex (GPT-5)
Signed-off-by: Lucas Holt <luke at foolishgames.com>



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