From 8a4e6637fc0621e90daa4decb4ee887a0af8ee24 Mon Sep 17 00:00:00 2001
From: Donald Sharp <sharpd@nvidia.com>
Date: Thu, 23 Feb 2023 13:29:32 -0500
Subject: [PATCH] bgpd: Flowspec overflow issue

According to the flowspec RFC 8955 a flowspec nlri is <length, <nlri data>>
Specifying 0 as a length makes BGP get all warm on the inside.  Which
in this case is not a good thing at all.  Prevent warmth, stay cold
on the inside.

Reported-by: Iggy Frankovic <iggyfran@amazon.com>
Signed-off-by: Donald Sharp <sharpd@nvidia.com>
(cherry picked from commit 0b999c886e241c52bd1f7ef0066700e4b618ebb3)
---
 bgpd/bgp_flowspec.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/bgpd/bgp_flowspec.c b/bgpd/bgp_flowspec.c
index 39c0cfe5147b..db61e290d6f8 100644
--- a/bgpd/bgp_flowspec.c
+++ b/bgpd/bgp_flowspec.c
@@ -141,6 +141,13 @@ int bgp_nlri_parse_flowspec(struct peer *peer, struct attr *attr,
 				psize);
 			return BGP_NLRI_PARSE_ERROR_PACKET_OVERFLOW;
 		}
+
+		if (psize == 0) {
+			flog_err(EC_BGP_FLOWSPEC_PACKET,
+				 "Flowspec NLRI length 0 which makes no sense");
+			return BGP_NLRI_PARSE_ERROR_PACKET_OVERFLOW;
+		}
+
 		if (bgp_fs_nlri_validate(pnt, psize, afi) < 0) {
 			flog_err(
 				EC_BGP_FLOWSPEC_PACKET,
