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-rw-r--r--ospfd/ospf_packet.c25
1 files changed, 15 insertions, 10 deletions
diff --git a/ospfd/ospf_packet.c b/ospfd/ospf_packet.c
index 151ed328..0f338d35 100644
--- a/ospfd/ospf_packet.c
+++ b/ospfd/ospf_packet.c
@@ -2455,16 +2455,10 @@ ospf_read (struct thread *thread)
/* associate packet with ospf interface */
oi = ospf_if_lookup_recv_if (ospf, iph->ip_src, ifp);
- /* Verify header fields before any further processing. */
- ret = ospf_verify_header (ibuf, oi, iph, ospfh);
- if (ret < 0)
- {
- if (IS_DEBUG_OSPF_PACKET (0, RECV))
- zlog_debug ("ospf_read[%s]: Header check failed, "
- "dropping.",
- inet_ntoa (iph->ip_src));
- return ret;
- }
+ /* ospf_verify_header() relies on a valid "oi" and thus can be called only
+ after the passive/backbone/other checks below are passed. These checks
+ in turn access the fields of unverified "ospfh" structure for their own
+ purposes and must remain very accurate in doing this. */
/* If incoming interface is passive one, ignore it. */
if (oi && OSPF_IF_PASSIVE_STATUS (oi) == OSPF_IF_PASSIVE)
@@ -2556,6 +2550,17 @@ ospf_read (struct thread *thread)
return 0;
}
+ /* Verify more OSPF header fields. */
+ ret = ospf_verify_header (ibuf, oi, iph, ospfh);
+ if (ret < 0)
+ {
+ if (IS_DEBUG_OSPF_PACKET (0, RECV))
+ zlog_debug ("ospf_read[%s]: Header check failed, "
+ "dropping.",
+ inet_ntoa (iph->ip_src));
+ return ret;
+ }
+
/* Show debug receiving packet. */
if (IS_DEBUG_OSPF_PACKET (ospfh->type - 1, RECV))
{