[Bug 277414] FAT SecPerClust=128 can cause crash

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From: <bugzilla-noreply_at_freebsd.org>
Date: Sat, 02 Mar 2024 05:03:34 UTC

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=277414

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

URL:
https://cgit.FreeBSD.org/src/commit/?id=7e4ac11b6076e6a9bf7341ddeae22784284ed733

commit 7e4ac11b6076e6a9bf7341ddeae22784284ed733
Author:     Konstantin Belousov <kib@FreeBSD.org>
AuthorDate: 2024-03-02 04:58:57 +0000
Commit:     Konstantin Belousov <kib@FreeBSD.org>
CommitDate: 2024-03-02 05:02:55 +0000

    getblkx(9): be more tolerant but also strict with the buffer size checks

    It is possible that on-disk filesystem format causes allocation of
    buffers of size larger than maxbcachebuf.  Currently, getblkx() and
    indirectly bufkva_alloc() panic in that situation.

    It is more useful to return an error instead, allowing the system to
    continue running.

    PR:     277414
    Reported by:    Robert Morris <rtm@lcs.mit.edu>
    MFC after:      1 week
    Sponsored by:   The FreeBSD Foundation

 sys/kern/vfs_bio.c | 12 ++++++++++--
 1 file changed, 10 insertions(+), 2 deletions(-)

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