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From b08afc81c60607a4f736f418f2e3eb06087f1a35 Mon Sep 17 00:00:00 2001
From: Donatas Abraitis <donatas@opensourcerouting.org>
Date: Fri, 20 Oct 2023 17:49:18 +0300
Subject: [PATCH] bgpd: Handle MP_REACH_NLRI malformed packets with session
reset
Avoid crashing bgpd.
Reported-by: Iggy Frankovic <iggyfran@amazon.com>
Signed-off-by: Donatas Abraitis <donatas@opensourcerouting.org>
---
bgpd/bgp_attr.c | 6 +-----
bgpd/bgp_attr.h | 1 -
bgpd/bgp_packet.c | 6 +-----
3 files changed, 2 insertions(+), 11 deletions(-)
diff --git a/bgpd/bgp_attr.c b/bgpd/bgp_attr.c
index 6925aff727e2..e7bb42a5d989 100644
--- a/bgpd/bgp_attr.c
+++ b/bgpd/bgp_attr.c
@@ -2421,7 +2421,7 @@ int bgp_mp_reach_parse(struct bgp_attr_parser_args *args,
mp_update->afi = afi;
mp_update->safi = safi;
- return BGP_ATTR_PARSE_EOR;
+ return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_MAL_ATTR, 0);
}
mp_update->afi = afi;
@@ -3759,10 +3759,6 @@ enum bgp_attr_parse_ret bgp_attr_parse(struct peer *peer, struct attr *attr,
goto done;
}
- if (ret == BGP_ATTR_PARSE_EOR) {
- goto done;
- }
-
if (ret == BGP_ATTR_PARSE_ERROR) {
flog_warn(EC_BGP_ATTRIBUTE_PARSE_ERROR,
"%s: Attribute %s, parse error", peer->host,
diff --git a/bgpd/bgp_attr.h b/bgpd/bgp_attr.h
index 961e5f122470..fc347e7a1b4b 100644
--- a/bgpd/bgp_attr.h
+++ b/bgpd/bgp_attr.h
@@ -364,7 +364,6 @@ enum bgp_attr_parse_ret {
/* only used internally, send notify + convert to BGP_ATTR_PARSE_ERROR
*/
BGP_ATTR_PARSE_ERROR_NOTIFYPLS = -3,
- BGP_ATTR_PARSE_EOR = -4,
BGP_ATTR_PARSE_MISSING_MANDATORY = -5,
};
diff --git a/bgpd/bgp_packet.c b/bgpd/bgp_packet.c
index b585591e2f69..5ecf343b6657 100644
--- a/bgpd/bgp_packet.c
+++ b/bgpd/bgp_packet.c
@@ -2397,8 +2397,7 @@ static int bgp_update_receive(struct peer_connection *connection,
* Non-MP IPv4/Unicast EoR is a completely empty UPDATE
* and MP EoR should have only an empty MP_UNREACH
*/
- if ((!update_len && !withdraw_len && nlris[NLRI_MP_UPDATE].length == 0)
- || (attr_parse_ret == BGP_ATTR_PARSE_EOR)) {
+ if (!update_len && !withdraw_len && nlris[NLRI_MP_UPDATE].length == 0) {
afi_t afi = 0;
safi_t safi;
struct graceful_restart_info *gr_info;
@@ -2419,9 +2418,6 @@ static int bgp_update_receive(struct peer_connection *connection,
&& nlris[NLRI_MP_WITHDRAW].length == 0) {
afi = nlris[NLRI_MP_WITHDRAW].afi;
safi = nlris[NLRI_MP_WITHDRAW].safi;
- } else if (attr_parse_ret == BGP_ATTR_PARSE_EOR) {
- afi = nlris[NLRI_MP_UPDATE].afi;
- safi = nlris[NLRI_MP_UPDATE].safi;
}
if (afi && peer->afc[afi][safi]) {
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