backport patch form upstream

(cherry picked from commit b6f633d5b7c57cbf6f78dbc1eb6ffb5998d4aeb6)

backport-output-Avoid-tickling-UBSAN-with-memcpy-dest-NULL-0.patch

@@ -0,0 +1,35 @@
+From a886ea40a29a08954ff80772e267828a1d440cc9 Mon Sep 17 00:00:00 2001
+From: Eric Blake <eblake@redhat.com>
+Date: Fri, 13 Jan 2023 16:27:54 -0600
+Subject: [PATCH] output: Avoid tickling UBSAN with memcpy(dest, NULL, 0)
+
+Even though all libc handle it sanely (because size 0 says there is
+nothing to copy), NULL is not a valid source pointer per a strict
+reading of C, so UBSAN flags it:
+
++output.c:511:9: runtime error: null pointer passed as argument 2, which is declared to never be null
+
+* src/output.c (make_room_for): Skip no-op memcpy.
+Fixes: https://savannah.gnu.org/support/index.php?110809
+Reported-by: Sam James
+---
+ src/output.c | 3 ++-
+ 1 file changed, 2 insertions(+), 1 deletion(-)
+
+diff --git a/src/output.c b/src/output.c
+index 956089b1..6dc8280a 100644
+--- a/src/output.c
++++ b/src/output.c
+@@ -508,7 +508,8 @@ make_room_for (int length)
+       {
+         char *buffer = output_diversion->u.buffer;
+         output_diversion->u.buffer = xcharalloc ((size_t) wanted_size);
+-        memcpy (output_diversion->u.buffer, buffer, output_diversion->used);
++        if (output_diversion->used)
++          memcpy (output_diversion->u.buffer, buffer, output_diversion->used);
+         free (buffer);
+       }
+ 
+-- 
+2.33.0
+

m4.spec

@@ -1,11 +1,12 @@
 Name:           m4
 Version:        1.4.19
-Release:        3
+Release:        4
 Summary:        A GNU implementation of macro processor
 License:        GPLv3+
 URL:            https://www.gnu.org/software/m4/
 Source0:        https://ftp.gnu.org/gnu/m4/%{name}-%{version}.tar.xz
 Patch1:         0001-Delete-test-execute_sh.patch 
+Patch6000:	backport-output-Avoid-tickling-UBSAN-with-memcpy-dest-NULL-0.patch
 
 BuildRequires:  gcc autoconf automake gettext-devel
 Provides:       bundled(gnulib)
@@ -55,6 +56,9 @@ make check
 %{_infodir}/m4*
 
 %changelog
+* Wed Jul 31 2024 zhangruifang <zhangruifang@h-partners.com> - 1.4.19-4
+- backport patch from upstream
+	
 * Tue Oct 25 2022 renhongxun <renhongxun@h-partners.com> - 1.4.19-3
 - Rebuild for next release