buildroot/package/lldpd/0001-daemon-fix-read-overflow-when-parsing-CDP-addresses.patch

From a9aeabdf879c25c584852a0bb5523837632f099b Mon Sep 17 00:00:00 2001
From: Vincent Bernat <vincent@bernat.ch>
Date: Wed, 12 Apr 2023 07:38:31 +0200
Subject: [PATCH] daemon: fix read overflow when parsing CDP addresses

Upstream: https://github.com/lldpd/lldpd/commit/a9aeabdf879c25c584852a0bb5523837632f099b
Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
---
 NEWS                       | 4 ++++
 src/daemon/protocols/cdp.c | 1 +
 2 files changed, 5 insertions(+)

diff --git a/src/daemon/protocols/cdp.c b/src/daemon/protocols/cdp.c
index 8a1be863..42861c0e 100644
--- a/src/daemon/protocols/cdp.c
+++ b/src/daemon/protocols/cdp.c
@@ -466,6 +466,7 @@ cdp_decode(struct lldpd *cfg, char *frame, int s, struct lldpd_hardware *hardwar
 					goto malformed;
 				}
 				PEEK_DISCARD(address_len);
+				addresses_len -= address_len;
 				(void)PEEK_SAVE(pos_next_address);
 				/* Next, we go back and try to extract
 				   IPv4 address */