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Date:      Wed, 08 Jan 2020 08:51:31 +0000
From:      bugzilla-noreply@freebsd.org
To:        bugs@FreeBSD.org
Subject:   [Bug 243179] fsck_msdosfs: Off-by-two in determination of FAT type
Message-ID:  <bug-243179-227@https.bugs.freebsd.org/bugzilla/>

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D243179

            Bug ID: 243179
           Summary: fsck_msdosfs: Off-by-two in determination of FAT type
           Product: Base System
           Version: CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: bin
          Assignee: bugs@FreeBSD.org
          Reporter: delphij@FreeBSD.org

The FAT type determination in fsck_msdosfs is wrong.

In the code we used NumClusters as the upper (non-inclusive) boundary of va=
lid
cluster number, so the actual value was 2 (CLUST_FIRST) more than the real
number of clusters.

Therefore, it's not right to use NumClusters as it is today to determine FAT
type.

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