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Subject: [Bug 127270] fsck_msdosfs(8) may crash if BytesPerSec is zero
Date: Sun, 15 Nov 2015 05:46:58 +0000
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=127270

NGie Cooper <ngie@FreeBSD.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Assignee|freebsd-fs@FreeBSD.org      |ngie@FreeBSD.org
                 CC|                            |ngie@FreeBSD.org

--- Comment #2 from NGie Cooper <ngie@FreeBSD.org> ---
This should avoid the divide by 0, but I'd need to verify that the behavior is
correct: 
https://people.freebsd.org/~ngie/bug127270.patch

This situation should occur if and when boot blocks 12 and 13 are 0, but there
might need to be some additional conditions that need to be tripped in order
for the divide by 0 to occur:

 66         boot->bpbBytesPerSec = block[11] + (block[12] << 8);

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