[NETFILTER]: nf_conntrack: check address family when finding protocol module

__nf_conntrack_{l3}proto_find() doesn't check the passed protocol family,
then it's possible to touch out of the array which has only AF_MAX items.

Spotted by Pablo Neira Ayuso.

Signed-off-by: Yasuyuki Kozakai <yasuyuki.kozakai@toshiba.co.jp>
Signed-off-by: YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>
Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 1 insertions, 1 deletions

diff --git a/net/netfilter/nf_conntrack_core.c b/net/netfilter/nf_conntrack_core.c
index 62bb509f05d4..0ce337a1d974 100644
--- a/net/netfilter/nf_conntrack_core.c
+++ b/net/netfilter/nf_conntrack_core.c
@@ -188,7 +188,7 @@ extern struct nf_conntrack_protocol nf_conntrack_generic_protocol;
 struct nf_conntrack_protocol *
 __nf_ct_proto_find(u_int16_t l3proto, u_int8_t protocol)
 {
-        if (unlikely(nf_ct_protos[l3proto] == NULL))
+        if (unlikely(l3proto >= AF_MAX || nf_ct_protos[l3proto] == NULL))
                 return &nf_conntrack_generic_protocol;
 
         return nf_ct_protos[l3proto][protocol];