[Bug 283426] panic in sbappendaddr_locked() - if_ovpn related?

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=283426

--- Comment #17 from [email protected] ---
A commit in branch main references this bug:

URL:
https://cgit.FreeBSD.org/src/commit/?id=04a7134c1e92c7752ffdc665f99ae26db70866c0

commit 04a7134c1e92c7752ffdc665f99ae26db70866c0
Author:     Kristof Provost <[email protected]>
AuthorDate: 2025-04-01 13:19:26 +0000
Commit:     Kristof Provost <[email protected]>
CommitDate: 2025-04-01 14:15:29 +0000

    if_ovpn: fix use-after-free of mbuf

    m_unshare() can return a new mbuf pointer. We update the 'm' pointer in
    ovpn_udp_input(), but if we decide to pass on the packet (e.g. because it's
for
    an unknown peer) the caller (udp_append()) continues with the old 'm'
pointer,
    eventually resulting in a use-after-free.

    Re-order operations in ovpn_udp_input() so that we don't modify the 'm'
pointer
    until we're committed to keeping the packet.

    PR:             283426
    Test case by:   [email protected]
    MFC after:      2 weeks
    Sponsored by:   Rubicon Communications, LLC ("Netgate")

 sys/net/if_ovpn.c                | 12 +++---
 tests/sys/net/if_ovpn/if_ovpn.sh | 81 ++++++++++++++++++++++++++++++++++++++++
 2 files changed, 87 insertions(+), 6 deletions(-)

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