From c6cab87df290448a63323c8ca759baa516166237 Mon Sep 17 00:00:00 2001
From: Evgeny Vereshchagin <evvers@ya.ru>
Date: Wed, 25 Oct 2023 18:15:42 +0000
Subject: [PATCH] tests: pass overly long TXT resource records

to make sure they don't crash avahi any more.
It reproduces https://github.com/lathiat/avahi/issues/455

Canonical notes:
nickgalanis> removed first hunk since there is no .github dir in this release

Upstream-Status: Backport [import from ubuntu https://git.launchpad.net/ubuntu/+source/avahi/tree/debian/patches/CVE-2023-38469-2.patch?h=ubuntu/jammy-security
Upstream commit https://github.com/lathiat/avahi/commit/c6cab87df290448a63323c8ca759baa516166237]
CVE: CVE-2023-38469
Signed-off-by: Vijay Anusuri <vanusuri@mvista.com>
---
 avahi-client/client-test.c       | 14 ++++++++++++++
 1 files changed, 14 insertions(+)

Index: avahi-0.8/avahi-client/client-test.c
===================================================================
--- avahi-0.8.orig/avahi-client/client-test.c
+++ avahi-0.8/avahi-client/client-test.c
@@ -22,6 +22,7 @@
 #endif
 
 #include <stdio.h>
+#include <string.h>
 #include <assert.h>
 
 #include <avahi-client/client.h>
@@ -33,6 +34,8 @@
 #include <avahi-common/malloc.h>
 #include <avahi-common/timeval.h>
 
+#include <avahi-core/dns.h>
+
 static const AvahiPoll *poll_api = NULL;
 static AvahiSimplePoll *simple_poll = NULL;
 
@@ -222,6 +225,9 @@ int main (AVAHI_GCC_UNUSED int argc, AVA
     uint32_t cookie;
     struct timeval tv;
     AvahiAddress a;
+    uint8_t rdata[AVAHI_DNS_RDATA_MAX+1];
+    AvahiStringList *txt = NULL;
+    int r;
 
     simple_poll = avahi_simple_poll_new();
     poll_api = avahi_simple_poll_get(simple_poll);
@@ -258,6 +264,14 @@ int main (AVAHI_GCC_UNUSED int argc, AVA
     printf("%s\n", avahi_strerror(avahi_entry_group_add_service (group, AVAHI_IF_UNSPEC, AVAHI_PROTO_UNSPEC, 0, "Lathiat's Site", "_http._tcp", NULL, NULL, 80, "foo=bar", NULL)));
     printf("add_record: %d\n", avahi_entry_group_add_record (group, AVAHI_IF_UNSPEC, AVAHI_PROTO_UNSPEC, 0, "TestX", 0x01, 0x10, 120, "\5booya", 6));
 
+    memset(rdata, 1, sizeof(rdata));
+    r = avahi_string_list_parse(rdata, sizeof(rdata), &txt);
+    assert(r >= 0);
+    assert(avahi_string_list_serialize(txt, NULL, 0) == sizeof(rdata));
+    error = avahi_entry_group_add_service_strlst(group, AVAHI_IF_UNSPEC, AVAHI_PROTO_UNSPEC, 0, "TestX", "_qotd._tcp", NULL, NULL, 123, txt);
+    assert(error == AVAHI_ERR_INVALID_RECORD);
+    avahi_string_list_free(txt);
+
     avahi_entry_group_commit (group);
 
     domain = avahi_domain_browser_new (avahi, AVAHI_IF_UNSPEC, AVAHI_PROTO_UNSPEC, NULL, AVAHI_DOMAIN_BROWSER_BROWSE, 0, avahi_domain_browser_callback, (char*) "omghai3u");
