netfilter: ipset: Missing gc cancellations fixed

commit 27c5a095e2518975e20a10102908ae8231699879 upstream.

The patch fdb8e12cc2cc ("netfilter: ipset: fix performance regression
in swap operation") missed to add the calls to gc cancellations
at the error path of create operations and at module unload. Also,
because the half of the destroy operations now executed by a
function registered by call_rcu(), neither NFNL_SUBSYS_IPSET mutex
or rcu read lock is held and therefore the checking of them results
false warnings.

Fixes: 97f7cf1cd80e ("netfilter: ipset: fix performance regression in swap operation")
Reported-by: syzbot+52bbc0ad036f6f0d4a25@syzkaller.appspotmail.com
Reported-by: Brad Spengler <spender@grsecurity.net>
Reported-by: Стас Ничипорович <stasn77@gmail.com>
Tested-by: Brad Spengler <spender@grsecurity.net>
Tested-by: Стас Ничипорович <stasn77@gmail.com>
Signed-off-by: Jozsef Kadlecsik <kadlec@netfilter.org>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/net/netfilter/ipset/ip_set_core.c b/net/netfilter/ipset/ip_set_core.c
index 08f0ecf872f229b9fbd9834843f524cb5a927a38..cc04c4d7956c5b917aef574d46b97d4722d68fb9 100644 (file)
--- a/net/netfilter/ipset/ip_set_core.c
+++ b/net/netfilter/ipset/ip_set_core.c
@@ -1158,6 +1158,7 @@ static int ip_set_create(struct net *net, struct sock *ctnl,
        return ret;
 
 cleanup:
+       set->variant->cancel_gc(set);
        set->variant->destroy(set);
 put_out:
        module_put(set->type->me);
@@ -2413,6 +2414,7 @@ ip_set_net_exit(struct net *net)
                set = ip_set(inst, i);
                if (set) {
                        ip_set(inst, i) = NULL;
+                       set->variant->cancel_gc(set);
                        ip_set_destroy_set(set);
                }
        }

diff --git a/net/netfilter/ipset/ip_set_hash_gen.h b/net/netfilter/ipset/ip_set_hash_gen.h
index 10f32a3682779fd4892615713c6eb1f5d00fd438..093ec52140084d5c51d4abf1c988091bf5f59c45 100644 (file)
--- a/net/netfilter/ipset/ip_set_hash_gen.h
+++ b/net/netfilter/ipset/ip_set_hash_gen.h
@@ -446,7 +446,7 @@ mtype_ahash_destroy(struct ip_set *set, struct htable *t, bool ext_destroy)
        u32 i;
 
        for (i = 0; i < jhash_size(t->htable_bits); i++) {
-               n = __ipset_dereference(hbucket(t, i));
+               n = (__force struct hbucket *)hbucket(t, i);
                if (!n)
                        continue;
                if (set->extensions & IPSET_EXT_DESTROY && ext_destroy)
@@ -466,7 +466,7 @@ mtype_destroy(struct ip_set *set)
        struct htype *h = set->data;
        struct list_head *l, *lt;
 
-       mtype_ahash_destroy(set, ipset_dereference_nfnl(h->table), true);
+       mtype_ahash_destroy(set, (__force struct htable *)h->table, true);
        list_for_each_safe(l, lt, &h->ad) {
                list_del(l);
                kfree(l);