[Bug 259645] crash in_cksumdata (sys/amd64/amd64/in_cksum.c:113) via in4_cksum (sys/netpfil/pf/in4_cksum.c:117) after FreeBSD 13.0 p5 update

From: <bugzilla-noreply_at_freebsd.org>
Date: Wed, 24 Nov 2021 18:39:50 UTC

--- Comment #17 from commit-hook@FreeBSD.org ---
A commit in branch main references this bug:


commit 0d9c3423f59bb305301f5a5bc7c8f5daf7b7aa52
Author:     Mark Johnston <markj@FreeBSD.org>
AuthorDate: 2021-11-24 18:19:54 +0000
Commit:     Mark Johnston <markj@FreeBSD.org>
CommitDate: 2021-11-24 18:31:16 +0000

    netinet: Implement in_cksum_skip() using m_apply()

    This allows it to work with unmapped mbufs.  In particular,
    in_cksum_skip() calls no longer need to be preceded by calls to
    mb_unmapped_to_ext() to avoid a page fault.

    PR:             259645
    Reviewed by:    gallatin, glebius, jhb
    MFC after:      1 week
    Sponsored by:   The FreeBSD Foundation
    Differential Revision:  https://reviews.freebsd.org/D33096

 sys/netinet/in_cksum.c | 63 +++++++++++++++++++++++++-------------------------
 1 file changed, 32 insertions(+), 31 deletions(-)

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