nf_ct_l4proto_net() may return NULL. That may happens if some module forget to set both l4proto->get_net_proto and l4proto->net_id. We'd check the return value here, in case crash happens. Signed-off-by: Yafang Shao <laoar.shao@xxxxxxxxx> --- net/netfilter/nf_conntrack_proto.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/net/netfilter/nf_conntrack_proto.c b/net/netfilter/nf_conntrack_proto.c index 154e8c0..316fef3 100644 --- a/net/netfilter/nf_conntrack_proto.c +++ b/net/netfilter/nf_conntrack_proto.c @@ -946,6 +946,9 @@ int nf_conntrack_proto_pernet_init(struct net *net) struct nf_proto_net *pn = nf_ct_l4proto_net(net, &nf_conntrack_l4proto_generic); + if (pn == NULL) + return -EINVAL; + err = nf_conntrack_l4proto_generic.init_net(net); if (err < 0) return err; -- 1.8.3.1
