[Bug 271378] negative jt_size in ffs truncate journal record causes fsck to crash

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=271378

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

URL:
https://cgit.FreeBSD.org/src/commit/?id=101a9ac07128a17d8797cc3e93978d2cfa457e99

commit 101a9ac07128a17d8797cc3e93978d2cfa457e99
Author:     Kirk McKusick <mckusick@FreeBSD.org>
AuthorDate: 2023-05-28 00:09:02 +0000
Commit:     Kirk McKusick <mckusick@FreeBSD.org>
CommitDate: 2023-05-28 00:12:30 +0000

    Fix a bug in fsck_ffs(8) triggered by corrupted filesystems.

    Check for valid file size before processing journal entries for it.
    Done by extracting the file size check from pass1.c into chkfilesize()
    then using it in the journal code in suj.c

    Reported-by:  Robert Morris
    PR:           271378
    MFC-after:    1 week
    Sponsored-by: The FreeBSD Foundation

 sbin/fsck_ffs/fsck.h   |  1 +
 sbin/fsck_ffs/fsutil.c | 25 +++++++++++++++++++++++++
 sbin/fsck_ffs/pass1.c  | 12 +-----------
 sbin/fsck_ffs/suj.c    |  3 +++
 4 files changed, 30 insertions(+), 11 deletions(-)

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