Purpose: Allows invalid NLRI attributes due to truncation issue.
Upstream: Not at the moment

diff -urN frr-frr-8.3.1/bgpd/bgp_attr.c.orig frr-frr-8.3.1/bgpd/bgp_attr.c
--- frr-frr-8.3.1/bgpd/bgp_attr.c.orig  2022-10-13 23:36:32.402753630 +0200
+++ frr-frr-8.3.1/bgpd/bgp_attr.c       2022-10-13 23:39:46.155219446 +0200
@@ -2277,9 +2277,13 @@
	 */
	if (length == 0) {
		bgp_attr_set_lcommunity(attr, NULL);
+#if 0
		/* Empty extcomm doesn't seem to be invalid per se */
		return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_OPT_ATTR_ERR,
					  args->total);
+#else
+		return BGP_ATTR_PARSE_PROCEED;
+#endif
	}
 
	bgp_attr_set_lcommunity(
@@ -2287,9 +2291,11 @@
	/* XXX: fix ecommunity_parse to use stream API */
	stream_forward_getp(peer->curr, length);

+#if 0
	if (!bgp_attr_get_lcommunity(attr))
		return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_OPT_ATTR_ERR,
					  args->total);
+#endif
 
	return BGP_ATTR_PARSE_PROCEED;
 }