[Bug dynamic-link/26076] New: dlclose crashes when cleaning up an empty namespace after dlmopen failure

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

https://sourceware.org/bugzilla/show_bug.cgi?id=26076

            Bug ID: 26076
           Summary: dlclose crashes when cleaning up an empty namespace
                    after dlmopen failure
           Product: glibc
           Version: unspecified
            Status: NEW
          Severity: minor
          Priority: P2
         Component: dynamic-link
          Assignee: unassigned at sourceware dot org
          Reporter: fweimer at redhat dot com
  Target Milestone: ---
             Flags: security-

If nothing has been loaded, ns->_ns_loaded is NULL and head->l_auditing
attempts to dereference a NULL pointer:

#ifdef SHARED
  /* Auditing checkpoint: we have deleted all objects.  */
  if (__glibc_unlikely (do_audit))
    {
      struct link_map *head = ns->_ns_loaded;
      /* Do not call the functions for any auditing object.  */
      if (head->l_auditing == 0)
        {
          struct audit_ifaces *afct = GLRO(dl_audit);
          for (unsigned int cnt = 0; cnt < GLRO(dl_naudit); ++cnt)
            {
              if (afct->activity != NULL)
                {
                  struct auditstate *state = link_map_audit_state (head, cnt);
                  afct->activity (&state->cookie, LA_ACT_CONSISTENT);
                }

              afct = afct->next;
            }
        }
    }
#endif

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