Fix a race between ip_set_dump_start() and ip_set_swap().
The race is as follows:
* Without holding the ref lock, ip_set_swap() checks ref_netlink of the
set and it is 0.
* ip_set_dump_start() takes a reference on the set.
* ip_set_swap() does the swap (even though it now has a non-zero
reference count).
* ip_set_dump_start() gets the set from ip_set_list again which is now a
different set since it has been swapped.
* ip_set_dump_start() calls __ip_set_put_netlink() and hits a BUG_ON due
to the reference count being 0.
Fix this race by extending the critical region in which the ref lock is
held to include checking the ref counts.
The race can be reproduced with the following script:
while :; do
ipset destroy hash_ip1
ipset destroy hash_ip2
ipset create hash_ip1 hash:ip family inet hashsize 1024 \
maxelem 500000
ipset create hash_ip2 hash:ip family inet hashsize 300000 \
maxelem 500000
ipset create hash_ip3 hash:ip family inet hashsize 1024 \
maxelem 500000
ipset save &
ipset swap hash_ip3 hash_ip2
ipset destroy hash_ip3
wait
done
Signed-off-by: Ross Lagerwall <ross.lagerwall@citrix.com>
Acked-by: Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
e5173418ac