package/lldpd: fix CVE-2023-41910

An issue was discovered in lldpd before 1.0.17. By crafting a CDP PDU
packet with specific CDP_TLV_ADDRESSES TLVs, a malicious actor can
remotely force the lldpd daemon to perform an out-of-bounds read on heap
memory. This occurs in cdp_decode in daemon/protocols/cdp.c.

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
(cherry picked from commit 3557a7b599b5b443730f8d0634a39c1694646ce3)
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

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

@@ -0,0 +1,24 @@
+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 */

package/lldpd/lldpd.mk

@@ -16,6 +16,9 @@ LLDPD_LICENSE = ISC
 LLDPD_LICENSE_FILES = LICENSE
 LLDPD_CPE_ID_VENDOR = lldpd_project
 
+# 0001-daemon-fix-read-overflow-when-parsing-CDP-addresses.patch
+LLDPD_IGNORE_CVES += CVE-2023-41910
+
 # Detection of c99 support in configure fails without WCHAR. To enable
 # automatic detection of c99 support by configure, we need to enable
 # WCHAR in toolchain. But actually we do not need WCHAR at lldpd