[Bug network/21359] New: ns_name_pack needs additional byte in destination buffer

["fweimer at redhat dot com" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=21359

            Bug ID: 21359
           Summary: ns_name_pack needs additional byte in destination
                    buffer
           Product: glibc
           Version: 2.25
            Status: NEW
          Severity: normal
          Priority: P2
         Component: network
          Assignee: unassigned at sourceware dot org
          Reporter: fweimer at redhat dot com
  Target Milestone: ---
             Flags: security-

ns_name_pack contains an off-by-one error which causes it to fail when the
destination buffer has the exact required size.

This does not affect name resolution because res_nmkquery calls
ns_name_compress with a larger destination buffer.

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