[Bug 6962] New: ip: addr flush hangs forever when called by non-root user

[bugzilla at busybox.net]

https://bugs.busybox.net/show_bug.cgi?id=6962

           Summary: ip: addr flush hangs forever when called by non-root
                    user
           Product: Busybox
           Version: 1.22.x
          Platform: All
        OS/Version: Linux
            Status: NEW
          Severity: minor
          Priority: P5
         Component: Networking
        AssignedTo: unassigned at busybox.net
        ReportedBy: a.gantvorg at gmx.net
                CC: busybox-cvs at busybox.net
   Estimated Hours: 0.0


Created attachment 5276
  --> https://bugs.busybox.net/attachment.cgi?id=5276
The quick-and-dirty patch that should further illustrate the issue.

When called without root privilleges, the "ip flush dev" command should return
with a "permission denied" message.

Busybox' implementation sends an according rtnl message but does not check for
response from kernel containing the error state
(networking/libiproute/ipaddress.c, flush_update()). Thus, the for-loop in
ipaddr_list_or_flush() is never left causing the applet to hang forever.

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