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eigrpd: When writing packet don't crash in some cases

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When we are writing a packet if we have gotten ourselves
into a bad situation, note it and move on.  Hopefully
dumping enough information so that we can find the offending
reason.

Signed-off-by: Donald Sharp <sharpd@cumulusnetworks.com>
This commit is contained in:
Donald Sharp 2017-10-29 08:51:57 -04:00
parent b42a4a099a
commit d4395853e8
2 changed files with 15 additions and 5 deletions
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15
eigrpd/eigrp_packet.c
View file

@ -344,8 +344,18 @@ int eigrp_write(struct thread *thread)
/* Get one packet from queue. */
ep = eigrp_fifo_next(ei->obuf);
assert(ep);
assert(ep->length >= EIGRP_HEADER_LEN);
if (!ep) {
zlog_err("%s: Interface %s no packet on queue?",
__PRETTY_FUNCTION__, ei->ifp->name);
goto out;
}
if (ep->length < EIGRP_HEADER_LEN) {
zlog_err("%s: Packet just has a header?",
__PRETTY_FUNCTION__);
eigrp_header_dump((struct eigrp_header *)ep->s->data);
eigrp_packet_delete(ei);
goto out;
}
if (ep->dst.s_addr == htonl(EIGRP_MULTICAST_ADDRESS))
eigrp_if_ipmulticast(eigrp, ei->address, ei->ifp->ifindex);
@ -442,6 +452,7 @@ int eigrp_write(struct thread *thread)
/* Now delete packet from queue. */
eigrp_packet_delete(ei);
out:
if (eigrp_fifo_next(ei->obuf) == NULL) {
ei->on_write_q = 0;
list_delete_node(eigrp->oi_write_q, node);

5
eigrpd/eigrp_query.c
View file

@ -165,7 +165,7 @@ void eigrp_send_query(struct eigrp_interface *ei)
struct listnode *node, *nnode, *node2, *nnode2;
struct eigrp_neighbor *nbr;
struct eigrp_prefix_entry *pe;
char has_tlv;
bool has_tlv = false;
bool ep_saved = false;
ep = eigrp_packet_new(ei->ifp->mtu, NULL);
@ -180,7 +180,6 @@ void eigrp_send_query(struct eigrp_interface *ei)
length += eigrp_add_authTLV_MD5_to_stream(ep->s, ei);
}
has_tlv = 0;
for (ALL_LIST_ELEMENTS(ei->eigrp->topology_changes_internalIPV4, node,
nnode, pe)) {
if (!(pe->req_action & EIGRP_FSM_NEED_QUERY))
@ -190,7 +189,7 @@ void eigrp_send_query(struct eigrp_interface *ei)
for (ALL_LIST_ELEMENTS(ei->nbrs, node2, nnode2, nbr)) {
if (nbr->state == EIGRP_NEIGHBOR_UP) {
listnode_add(pe->rij, nbr);
has_tlv = 1;
has_tlv = true;;
}
}
}