[NETFILTER] ctnetlink: Fix oops when no ICMP ID info in message

This patch fixes an userspace triggered oops. If there is no ICMP_ID
info the reference to attr will be NULL.

Signed-off-by: Krzysztof Piotr Oledzki <ole@ans.pl>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Signed-off-by: Harald Welte <laforge@netfilter.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/net/ipv4/netfilter/ip_conntrack_proto_icmp.c b/net/ipv4/netfilter/ip_conntrack_proto_icmp.c
index 9481d15..083951e 100644 (file)
--- a/net/ipv4/netfilter/ip_conntrack_proto_icmp.c
+++ b/net/ipv4/netfilter/ip_conntrack_proto_icmp.c
@@ -296,7 +296,8 @@ static int icmp_nfattr_to_tuple(struct nfattr *tb[],
                                struct ip_conntrack_tuple *tuple)
 {
        if (!tb[CTA_PROTO_ICMP_TYPE-1]
-           || !tb[CTA_PROTO_ICMP_CODE-1])
+           || !tb[CTA_PROTO_ICMP_CODE-1]
+           || !tb[CTA_PROTO_ICMP_ID-1])
                return -1;
 
        tuple->dst.u.icmp.type =