diff options
| author | Jozsef Kadlecsik <kadlec@blackhole.kfki.hu> | 2016-03-08 20:29:10 +0100 |
|---|---|---|
| committer | Jozsef Kadlecsik <kadlec@blackhole.kfki.hu> | 2016-03-08 20:29:10 +0100 |
| commit | 367e198805de5027da779ab86cebd4a2c69c75d8 (patch) | |
| tree | 16b0f5183b451b174696fee7b571e0a1274e5aa4 /kernel/net/netfilter/ipset/ip_set_hash_mac.c | |
| parent | 7dcaf666bbc8290f8eb0eb3ec4dd0c5631020347 (diff) | |
netfilter: ipset: Check IPSET_ATTR_ETHER netlink attribute length
Julia Lawall pointed out that IPSET_ATTR_ETHER netlink attribute length
was not checked explicitly, just for the maximum possible size. Malicious
netlink clients could send shorter attribute and thus resulting a kernel
read after the buffer.
The patch adds the explicit length checkings.
Reported-by: Julia Lawall <julia.lawall@lip6.fr>
Signed-off-by: Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>
Diffstat (limited to 'kernel/net/netfilter/ipset/ip_set_hash_mac.c')
| -rw-r--r-- | kernel/net/netfilter/ipset/ip_set_hash_mac.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/kernel/net/netfilter/ipset/ip_set_hash_mac.c b/kernel/net/netfilter/ipset/ip_set_hash_mac.c index f1e7d2c..8f004ed 100644 --- a/kernel/net/netfilter/ipset/ip_set_hash_mac.c +++ b/kernel/net/netfilter/ipset/ip_set_hash_mac.c @@ -110,7 +110,8 @@ hash_mac4_uadt(struct ip_set *set, struct nlattr *tb[], if (tb[IPSET_ATTR_LINENO]) *lineno = nla_get_u32(tb[IPSET_ATTR_LINENO]); - if (unlikely(!tb[IPSET_ATTR_ETHER])) + if (unlikely(!tb[IPSET_ATTR_ETHER] || + nla_len(tb[IPSET_ATTR_ETHER]) != ETH_ALEN)) return -IPSET_ERR_PROTOCOL; ret = ip_set_get_extensions(set, tb, &ext); |