diff --git a/bugfix-add-check-to-avoid-invalid-ptr-for-strcmp.patch b/bugfix-add-check-to-avoid-invalid-ptr-for-strcmp.patch
new file mode 100644
index 0000000000000000000000000000000000000000..215019c2284d25333427b2776413bb2d90a763cd
--- /dev/null
+++ b/bugfix-add-check-to-avoid-invalid-ptr-for-strcmp.patch
@@ -0,0 +1,29 @@
+From 360a23478dda391daa056c08a7c564f5b350e43a Mon Sep 17 00:00:00 2001
+From: nocjj <1250062498@qq.com>
+Date: Thu, 21 Jan 2021 10:57:09 +0800
+Subject: [PATCH 16/16] bugfix: add check to avoid invalid ptr for strcmp
+
+If len of d_name is less than "pid", it will pass a invalid ptr
+to strcmp, which will cause crash.
+---
+ src/domain.c | 4 ++++
+ 1 file changed, 4 insertions(+)
+
+diff --git a/src/domain.c b/src/domain.c
+index 7f9173d..f8dea48 100644
+--- a/src/domain.c
++++ b/src/domain.c
+@@ -253,6 +253,10 @@ static int check_pid_file(const char *d_name)
+     int extern_len = strlen(extern_name);
+     int len = strlen(d_name);
+ 
++    if (len <= extern_len) {
++        return -1;
++    }
++
+     return strcmp(d_name + len - extern_len, extern_name);
+ }
+ 
+-- 
+2.27.0
+
diff --git a/vmtop.spec b/vmtop.spec
index 5b5a155d4a54a89c8734860cd1adb8581a7b3ffd..377bde97fafad52b41c3b5f760b3c6a999d94347 100644
--- a/vmtop.spec
+++ b/vmtop.spec
@@ -1,6 +1,6 @@
 Name: vmtop
 Version: 1.1
-Release: 3
+Release: 4
 Summary: A tool for collecting and analyzing data of virtual machine
 License: Mulan PSL V2
 Group: Application/System
@@ -27,6 +27,7 @@ Patch0015: vcpu_stat-get-vcpu-stat-list-once-per-display-instea.patch
 Patch0016: proc-del-prc-pid-comm-read.patch
 Patch0017: display-del-screen-clear-after-key-response.patch
 Patch0018: codestyle-del-unused-var.patch
+Patch0019: bugfix-add-check-to-avoid-invalid-ptr-for-strcmp.patch
 
 Requires: libvirt, ncurses
 
@@ -67,6 +68,9 @@ install -m 550 vmtop ${RPM_BUILD_ROOT}/usr/bin/%{name}
 %{_bindir}/vmtop
 
 %changelog
+* Wed 27 Jan 2021 Jiajun Chen <1250062498@qq.com> -1.1-4
+- bugfix: add check to avoid invalid ptr for strcmp
+
 * Mon Dec 07 2020 Jiajun Chen <1250062498@qq.com> -1.1-3
 - vcpu_stat: add remaining kvm exits items to display
 - display: modify filter display to support more display fields items