netfilter: ipset: fix netiface set name overflow

attribute is copied to IFNAMSIZ-size stack variable,
but IFNAMSIZ is smaller than IPSET_MAXNAMELEN.

Fortunately nfnetlink needs CAP_NET_ADMIN.

Signed-off-by: Florian Westphal <fw@strlen.de>
Acked-by: Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

diff --git a/net/netfilter/ipset/ip_set_hash_netiface.c b/net/netfilter/ipset/ip_set_hash_netiface.c
index b9a6338..45a1014 100644 (file)
--- a/net/netfilter/ipset/ip_set_hash_netiface.c
+++ b/net/netfilter/ipset/ip_set_hash_netiface.c
@@ -793,7 +793,7 @@ static struct ip_set_type hash_netiface_type __read_mostly = {
                [IPSET_ATTR_IP]         = { .type = NLA_NESTED },
                [IPSET_ATTR_IP_TO]      = { .type = NLA_NESTED },
                [IPSET_ATTR_IFACE]      = { .type = NLA_NUL_STRING,
-                                           .len = IPSET_MAXNAMELEN - 1 },
+                                           .len  = IFNAMSIZ - 1 },
                [IPSET_ATTR_CADT_FLAGS] = { .type = NLA_U32 },
                [IPSET_ATTR_CIDR]       = { .type = NLA_U8 },
                [IPSET_ATTR_TIMEOUT]    = { .type = NLA_U32 },