diff --git a/SOURCES/psmisc-23.1-pstree-consecutive-NULs.patch b/SOURCES/psmisc-23.1-pstree-consecutive-NULs.patch
new file mode 100644
index 0000000..976d4c7
--- /dev/null
+++ b/SOURCES/psmisc-23.1-pstree-consecutive-NULs.patch
@@ -0,0 +1,17 @@
+diff -up ./src/pstree.c.ori ./src/pstree.c
+--- ./src/pstree.c.ori	2017-06-12 02:24:29.089210495 +0200
++++ ./src/pstree.c	2020-07-03 21:24:47.257760342 +0200
+@@ -530,8 +530,12 @@ static void set_args(PROC * this, const
+     }
+     this->argc = 0;
+     for (i = 0; i < size - 1; i++)
+-        if (!args[i])
++        if (!args[i]) {
+             this->argc++;
++            /* now skip consecutive NUL */
++            while(!args[i] && (i < size -1 ))
++                i++;
++        }
+     if (!this->argc)
+         return;
+     if (!(this->argv = malloc(sizeof(char *) * this->argc))) {
diff --git a/SPECS/psmisc.spec b/SPECS/psmisc.spec
index b34cedb..f6c0b90 100644
--- a/SPECS/psmisc.spec
+++ b/SPECS/psmisc.spec
@@ -2,7 +2,7 @@
 Summary: Utilities for managing processes on your system
 Name: psmisc
 Version: 23.1
-Release: 4%{?dist}
+Release: 5%{?dist}
 License: GPLv2+
 Group: Applications/System
 URL: https://gitlab.com/psmisc/psmisc
@@ -12,6 +12,7 @@ Source: https://sourceforge.net/projects/%{name}/files/%{name}/%{name}-%{version
 #The following has been reworked by upstream in a different way ... we'll see
 #Patch1: psmisc-22.13-fuser-silent.patch
 Patch2: psmisc-23.1-no-nullptr-sanity-stalls-nfs.patch
+Patch3: psmisc-23.1-pstree-consecutive-NULs.patch
 
 BuildRequires: libselinux-devel
 BuildRequires: gettext
@@ -31,6 +32,7 @@ command shows the path of log files owned by a given process.
 %prep
 %setup -q
 %patch2 -p1
+%patch3 -p1
 
 %build
 %configure --prefix=%{_prefix} --enable-selinux
@@ -69,6 +71,10 @@ mv $RPM_BUILD_ROOT%{_bindir}/fuser $RPM_BUILD_ROOT%{_sbindir}
 
 
 %changelog
+* Fri Jul 03 2020 Jan Rybar <jrybar@redhat.com> - 23.1-5
+- pstree -al incorrectly handles large empty cmdline
+- Resolves: rhbz#1715509
+
 * Wed Jun 12 2019 Jan Rybar <jrybar@redhat.com> - 23.1-4
 - backport of patch fixing fuser stalling NFS on non-existent file
 - Resolves: rhbz#1693785