[Bug 275920] Kernel crash in sys/netlink/route/iface.c:124

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=275920

--- Comment #6 from commit-hook@FreeBSD.org ---
A commit in branch main references this bug:

URL:
https://cgit.FreeBSD.org/src/commit/?id=43387b4e574043b78a58c8bcb7575161b055fce1

commit 43387b4e574043b78a58c8bcb7575161b055fce1
Author:     Kristof Provost <kp@FreeBSD.org>
AuthorDate: 2024-05-06 09:39:08 +0000
Commit:     Kristof Provost <kp@FreeBSD.org>
CommitDate: 2024-05-06 09:39:08 +0000

    if: guard against if_ioctl being NULL

    There are situations where an struct ifnet has a NULL if_ioctl pointer.

    For example, e6000sw creates such struct ifnets for each of its ports so it
can
    call into the MII code.

    If there is then a link state event this calls do_link_state_change()
    -> rtnl_handle_ifevent() -> dump_iface() -> get_operstate() ->
    get_operstate_ether(). That wants to know if the link is up or down, so it
tries
    to ioctl(SIOCGIFMEDIA), which doesn't go well if if_ioctl is NULL.

    Guard against this, and return EOPNOTSUPP.

    PR:             275920
    MFC ater:       3 days
    Sponsored by:   Rubicon Communications, LLC ("Netgate")

 sys/net/if.c | 3 +++
 1 file changed, 3 insertions(+)

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