diff --git a/backport-core-fix-free-undefined-pointer-when-strdup-failed-i.patch b/backport-core-fix-free-undefined-pointer-when-strdup-failed-i.patch
new file mode 100644
index 0000000000000000000000000000000000000000..8c68ab479fa238b883fa5a69f9d157c60e986a2b
--- /dev/null
+++ b/backport-core-fix-free-undefined-pointer-when-strdup-failed-i.patch
@@ -0,0 +1,33 @@
+From 1509274359979079e3e61899ce12fc8b0f0958d9 Mon Sep 17 00:00:00 2001
+From: xujing <17826839720@163.com>
+Date: Wed, 8 Sep 2021 14:26:20 +0800
+Subject: [PATCH] core: fix free undefined pointer when strdup failed in the
+ first loop
+
+---
+ src/core/load-fragment.c | 4 ++--
+ 1 file changed, 2 insertions(+), 2 deletions(-)
+
+diff --git a/src/core/load-fragment.c b/src/core/load-fragment.c
+index 92815b1dbaea..1c8159a23550 100644
+--- a/src/core/load-fragment.c
++++ b/src/core/load-fragment.c
+@@ -800,7 +800,7 @@ int config_parse_exec(
+                 if (!separate_argv0) {
+                         char *w = NULL;
+ 
+-                        if (!GREEDY_REALLOC(n, nlen + 2))
++                        if (!GREEDY_REALLOC0(n, nlen + 2))
+                                 return log_oom();
+ 
+                         w = strdup(path);
+@@ -832,7 +832,7 @@ int config_parse_exec(
+                                 p += 2;
+                                 p += strspn(p, WHITESPACE);
+ 
+-                                if (!GREEDY_REALLOC(n, nlen + 2))
++                                if (!GREEDY_REALLOC0(n, nlen + 2))
+                                         return log_oom();
+ 
+                                 w = strdup(";");
+
diff --git a/systemd.spec b/systemd.spec
index 70eea8d47f6c19f0db8a98c86c1545aa7a2e2d7d..f250eafc078424d943e79fc2e2133f20487a8d73 100644
--- a/systemd.spec
+++ b/systemd.spec
@@ -20,7 +20,7 @@
 Name:           systemd
 Url:            https://www.freedesktop.org/wiki/Software/systemd
 Version:        248
-Release:        12
+Release:        13
 License:        MIT and LGPLv2+ and GPLv2+
 Summary:        System and Service Manager
 
@@ -66,7 +66,7 @@ Patch0017:      0017-fix-capsh-drop-but-ping-success.patch
 Patch0018:      0018-resolved-create-etc-resolv.conf-symlink-at-runtime.patch
 Patch0019:      0019-journald-enforce-longer-line-length-limit-during-set.patch
 Patch0020:      0020-fix-CVE-2021-33910.patch
-
+Patch0021:      backport-core-fix-free-undefined-pointer-when-strdup-failed-i.patch
 
 BuildRequires:  gcc, gcc-c++
 BuildRequires:  libcap-devel, libmount-devel, pam-devel, libselinux-devel
@@ -1551,6 +1551,9 @@ fi
 %exclude /usr/share/man/man3/*
 
 %changelog
+* Thu Sep 16 2021 ExtinctFire <shenyining_00@126.com> - 248-13
+- core: fix free undefined pointer when strdup failed in the first loop
+
 * Mon Sep 6 2021 yangmingtai <yangmingtai@huawei.com> - 248-12
 - move postun to correct position