[Bug nss/20237] New: getservent segfaults in the db NSS service module without preceding setservent

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

https://sourceware.org/bugzilla/show_bug.cgi?id=20237

            Bug ID: 20237
           Summary: getservent segfaults in the db NSS service module
                    without preceding setservent
           Product: glibc
           Version: 2.24
            Status: NEW
          Severity: normal
          Priority: P2
         Component: nss
          Assignee: unassigned at sourceware dot org
          Reporter: fweimer at redhat dot com
  Target Milestone: ---
             Flags: security-

If getservent is called without a preceding setservent call, the implementation
in the âdbâ NSS service module segfaults.

This is a supported use case, the setservent is supposed to be implicit. 
Apparently, this breaks some applications.

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