[Bug 297148] SIOCGETSGCNT before MRT_INIT yields kernel crash

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=297148

--- Comment #1 from commit-hook@FreeBSD.org ---
A commit in branch main references this bug:

URL:
https://cgit.FreeBSD.org/src/commit/?id=1c0d2f0b1a98526e4f1f5a051ce6904b4c3164e1

commit 1c0d2f0b1a98526e4f1f5a051ce6904b4c3164e1
Author:     Mark Johnston <markj@FreeBSD.org>
AuthorDate: 2026-08-03 20:44:14 +0000
Commit:     Mark Johnston <markj@FreeBSD.org>
CommitDate: 2026-08-03 20:50:14 +0000

    ip_mroute: Don't assume that a multicast router is running

    The SIOCGETSGCNT handler may be invoked in this scenario, and if no
    router has initialized the lookup table, we'll have
    mfct->mfchashtbl == NULL.

    PR:             297148
    Reported by:    Robert Morris
    MFC after:      1 week
    Sponsored by:   The FreeBSD Foundation

 sys/netinet/ip_mroute.c | 2 ++
 1 file changed, 2 insertions(+)

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