diff options
| -rw-r--r-- | ospfd/ospf_packet.c | 25 |
1 files changed, 15 insertions, 10 deletions
diff --git a/ospfd/ospf_packet.c b/ospfd/ospf_packet.c index 489b928c..c347f31d 100644 --- a/ospfd/ospf_packet.c +++ b/ospfd/ospf_packet.c @@ -2392,16 +2392,10 @@ 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) @@ -2493,6 +2487,17 @@ 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)) { |