diff options
| author | Jozsef Kadlecsik <kadlec@netfilter.org> | 2021-07-16 14:36:45 +0200 |
|---|---|---|
| committer | Jozsef Kadlecsik <kadlec@netfilter.org> | 2021-07-16 14:36:45 +0200 |
| commit | a63d02aeb7d00a2546c8bfc966b415704979b043 (patch) | |
| tree | 844aa3fbe03f995d38fdaf61656143a640806a3b /kernel/net/netfilter/ipset/ip_set_hash_ip.c | |
| parent | 0ec051e61f0568e27688248dc28f568127780437 (diff) | |
Limit the maximal range of consecutive elements to add/delete fix
Avoid possible number overflows when calculating the number of
consecutive elements. Also, compute properly the consecutive
elements in the case of hash:net* types.
Signed-off-by: Jozsef Kadlecsik <kadlec@netfilter.org>
Diffstat (limited to 'kernel/net/netfilter/ipset/ip_set_hash_ip.c')
| -rw-r--r-- | kernel/net/netfilter/ipset/ip_set_hash_ip.c | 7 |
1 files changed, 5 insertions, 2 deletions
diff --git a/kernel/net/netfilter/ipset/ip_set_hash_ip.c b/kernel/net/netfilter/ipset/ip_set_hash_ip.c index a3559d7..789b28a 100644 --- a/kernel/net/netfilter/ipset/ip_set_hash_ip.c +++ b/kernel/net/netfilter/ipset/ip_set_hash_ip.c @@ -133,8 +133,11 @@ hash_ip4_uadt(struct ip_set *set, struct nlattr *tb[], ret = ip_set_get_hostipaddr4(tb[IPSET_ATTR_IP_TO], &ip_to); if (ret) return ret; - if (ip > ip_to) + if (ip > ip_to) { + if (ip_to == 0) + return -IPSET_ERR_HASH_ELEM; swap(ip, ip_to); + } } else if (tb[IPSET_ATTR_CIDR]) { u8 cidr = nla_get_u8(tb[IPSET_ATTR_CIDR]); @@ -145,7 +148,7 @@ hash_ip4_uadt(struct ip_set *set, struct nlattr *tb[], hosts = h->netmask == 32 ? 1 : 2 << (32 - h->netmask - 1); - if ((ip_to - ip + 1)/hosts > IPSET_MAX_RANGE) + if (((u64)ip_to - ip + 1)/hosts > IPSET_MAX_RANGE) return -ERANGE; if (retried) { |