[Bug 255069] net.link.ether.ipfw=1 leads to kernel panic under 13.0-RELEASE amd64

From: <bugzilla-noreply_at_freebsd.org>
Date: Wed, 16 Jun 2021 14:02:38 UTC

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


commit bc6a2267fffeafd3946637607a74cfd639398f9d
Author:     Mark Johnston <markj@FreeBSD.org>
AuthorDate: 2021-06-16 13:46:56 +0000
Commit:     Mark Johnston <markj@FreeBSD.org>
CommitDate: 2021-06-16 13:46:56 +0000

    ipfw: Update the pfil mbuf pointer in ipfw_check_frame()

    ipfw_chk() might call m_pullup() and thus can change the mbuf chain
    head.  In this case, the new chain head has to be returned to the pfil
    hook caller, otherwise the pfil hook caller is left with a dangling

    Note that this affects only the link-layer hooks installed when the
    net.link.ether.ipfw sysctl is set to 1.

    PR:             256439, 254015, 255069, 255104
    Fixes:          f355cb3e6
    Reviewed by:    ae
    MFC after:      3 days
    Sponsored by:   The FreeBSD Foundation
    Differential Revision:  https://reviews.freebsd.org/D30764

 sys/netpfil/ipfw/ip_fw_pfil.c | 2 ++
 1 file changed, 2 insertions(+)

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