Hello,

When executing the following command using unprivileged users there is
an infinite loop...
/sbin/ip route flush dev eth1

Execution with -s produces:
*** Round 28153, deleting 2 entries ***

*** Round 28154, deleting 2 entries ***

*** Round 28155, deleting 2 entries ***

*** Round 28156, deleting 2 entries ***

*** Round 28157, deleting 2 entries ***

*** Round 28158, deleting 2 entries ***

*** Round 28159, deleting 2 entries ***

I do not fully understand the sequence, but it may be kernel fault, as
it should have returned EPERM for this request stopping the netlink
request.

Anyway... A simple solution is to store the filter.flushed and fail if
it keeps its value during loop iteration at
ip/ipaddress.c::ipaddr_list_or_flush(), but this is only a
workaround...

Please CC as I am not in netdev list.
Thanks!
Alon.
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