- Ensure that the computed MFT record size isn't negative or larger than
maxphys before trying to read $Volume.
- Guard against truncated records in volume metadata.
- Ensure that the record length is large enough to contain the volume
name.
- Verify that the (UTF-16-encoded) volume name's length is a multiple of
two.
PR: 258833, 258914
MFC after: 2 weeks
Sponsored by: The FreeBSD Foundation
f0a08fa9f5