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-rw-r--r--proto/ospf/hello.c18
1 files changed, 13 insertions, 5 deletions
diff --git a/proto/ospf/hello.c b/proto/ospf/hello.c
index 783761f..855b070 100644
--- a/proto/ospf/hello.c
+++ b/proto/ospf/hello.c
@@ -45,12 +45,20 @@ void
ospf_hello_receive(struct ospf_packet *ps_i, struct ospf_iface *ifa,
struct ospf_neighbor *n, ip_addr faddr)
{
- struct ospf_hello_packet *ps = (void *) ps_i;
- u32 *pnrid;
+ struct proto *p = &ifa->oa->po->proto;
+ char *beg = "Bad OSPF HELLO packet from ", *rec = " received: ";
+ unsigned int size, i, twoway, oldpriority, eligible, peers;
u32 olddr, oldbdr, oldiface_id, tmp;
- char *beg = "Bad OSPF hello packet from ", *rec = " received: ";
- struct proto *p = (struct proto *) ifa->oa->po;
- unsigned int size = ntohs(ps->ospf_packet.length), i, twoway, oldpriority, eligible = 0, peers;
+ u32 *pnrid;
+
+ size = ntohs(ps_i->length);
+ if (size < sizeof(struct ospf_hello_packet))
+ {
+ log(L_ERR "%s%I - too short (%u B)", beg, faddr, size);
+ return;
+ }
+
+ struct ospf_hello_packet *ps = (void *) ps_i;
OSPF_TRACE(D_PACKETS, "HELLO packet received from %I via %s%s", faddr,
(ifa->type == OSPF_IT_VLINK ? "vlink-" : ""), ifa->iface->name);