!65 fix CVE-2023-38470

From: @zppzhangpan 
Reviewed-by: @t_feng 
Signed-off-by: @t_feng

avahi.spec

@@ -3,7 +3,7 @@
 
 Name:             avahi
 Version:          0.8
-Release:          16
+Release:          17
 Summary:          Avahi is a local network service discovery
 License:          LGPLv2+
 URL:              http://avahi.org
@@ -19,7 +19,8 @@ Patch5:           0005-avahi_dns_packet_consume_uint32-fix-potential-undefi.patc
 
 Patch6001:        backport-CVE-2021-3468.patch
 Patch6002:        backport-CVE-2021-36217.patch
-Patch6023:        backport-CVE-2023-1981.patch
+Patch6003:        backport-CVE-2023-1981.patch
+Patch6004:        backport-CVE-2023-38470.patch
 
 BuildRequires:    gcc automake libtool desktop-file-utils gtk2-devel glib2-devel gcc-c++
 BuildRequires:    libcap-devel expat-devel gdbm-devel make
@@ -579,6 +580,9 @@ fi
 %{_mandir}/man8/*
 
 %changelog
+* Mon Oct 16 2023 zhangpan <zhangpan103@h-partners.com> - 0.8-17
+- fix CVE-2023-38470
+
 * Wed Apr 12 2023 zhouwenpei <zhouwenpei1@h-partners.com> - 0.8-16
 - fix CVE-2023-1981
 

backport-CVE-2023-38470.patch

@@ -0,0 +1,56 @@
+From 94cb6489114636940ac683515417990b55b5d66c Mon Sep 17 00:00:00 2001
+From: =?UTF-8?q?Petr=20Men=C5=A1=C3=ADk?= <pemensik@redhat.com>
+Date: Tue, 11 Apr 2023 15:29:59 +0200
+Subject: [PATCH] Ensure each label is at least one byte long
+
+The only allowed exception is single dot, where it should return empty
+string.
+
+Fixes #454.
+
+Reference:https://github.com/lathiat/avahi/commit/94cb6489114636940ac683515417990b55b5d66c
+Conflict:NA
+
+---
+ avahi-common/domain-test.c | 14 ++++++++++++++
+ avahi-common/domain.c      |  2 +-
+ 2 files changed, 15 insertions(+), 1 deletion(-)
+
+diff --git a/avahi-common/domain-test.c b/avahi-common/domain-test.c
+index cf763eca6..3acc1c1e4 100644
+--- a/avahi-common/domain-test.c
++++ b/avahi-common/domain-test.c
+@@ -45,6 +45,20 @@ int main(AVAHI_GCC_UNUSED int argc, AVAHI_GCC_UNUSED char *argv[]) {
+     printf("%s\n", s = avahi_normalize_name_strdup("fo\\\\o\\..f oo."));
+     avahi_free(s);
+ 
++    printf("%s\n", s = avahi_normalize_name_strdup("."));
++    avahi_free(s);
++
++    s = avahi_normalize_name_strdup(",.=.}.=.?-.}.=.?.?.}.}.?.?.?.z.?.?.}.}."
++		    "}.?.?.?.r.=.=.}.=.?.}}.}.?.?.?.zM.=.=.?.?.}.}.?.?.}.}.}"
++		    ".?.?.?.r.=.=.}.=.?.}}.}.?.?.?.zM.=.=.?.?.}.}.?.?.?.zM.?`"
++		    "?.}.}.}.?.?.?.r.=.?.}.=.?.?.}.?.?.?.}.=.?.?.}??.}.}.?.?."
++		    "?.z.?.?.}.}.}.?.?.?.r.=.=.}.=.?.}}.}.?.?.?.zM.?`?.}.}.}."
++		    "??.?.zM.?`?.}.}.}.?.?.?.r.=.?.}.=.?.?.}.?.?.?.}.=.?.?.}?"
++		    "?.}.}.?.?.?.z.?.?.}.}.}.?.?.?.r.=.=.}.=.?.}}.}.?.?.?.zM."
++		    "?`?.}.}.}.?.?.?.r.=.=.?.?`.?.?}.}.}.?.?.?.r.=.?.}.=.?.?."
++		    "}.?.?.?.}.=.?.?.}");
++    assert(s == NULL);
++
+     printf("%i\n", avahi_domain_equal("\\065aa bbb\\.\\046cc.cc\\\\.dee.fff.", "Aaa BBB\\.\\.cc.cc\\\\.dee.fff"));
+     printf("%i\n", avahi_domain_equal("A", "a"));
+ 
+diff --git a/avahi-common/domain.c b/avahi-common/domain.c
+index 3b1ab6834..e66d2416c 100644
+--- a/avahi-common/domain.c
++++ b/avahi-common/domain.c
+@@ -201,7 +201,7 @@ char *avahi_normalize_name(const char *s, char *ret_s, size_t size) {
+         }
+ 
+         if (!empty) {
+-            if (size < 1)
++            if (size < 2)
+                 return NULL;
+ 
+             *(r++) = '.';