[Bug 201288] usr.sbin/bhyve/pci_virtio_block.c:320: 21 into 20 won't go

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=201288

            Bug ID: 201288
           Summary: usr.sbin/bhyve/pci_virtio_block.c:320: 21 into 20
                    won't go
           Product: Base System
           Version: 10.1-RELEASE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: misc
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: dcb314 at hotmail.com

usr.sbin/bhyve/pci_virtio_block.c:320]: (error) Buffer is accessed out of
bounds: sc.vbsc_ident

    sprintf(sc->vbsc_ident, "BHYVE-%02X%02X-%02X%02X-%02X%02X",
        digest[0], digest[1], digest[2], digest[3], digest[4], digest[5]);

sprintf writes 21 bytes into a 20 byte field.

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