diff --git a/pycups-uninit.patch b/pycups-uninit.patch
new file mode 100644
index 0000000..28bf5e7
--- /dev/null
+++ b/pycups-uninit.patch
@@ -0,0 +1,65 @@
+diff -up pycups-1.9.30/cupsconnection.c.uninit pycups-1.9.30/cupsconnection.c
+--- pycups-1.9.30/cupsconnection.c.uninit	2007-11-19 16:41:14.000000000 +0000
++++ pycups-1.9.30/cupsconnection.c	2007-11-21 11:18:20.000000000 +0000
+@@ -2334,7 +2334,7 @@ Connection_printTestPage (Connection *se
+     return NULL;
+   }
+     
+-  if (!file) {
++  if (!fileobj) {
+     if ((datadir = getenv ("CUPS_DATADIR")) == NULL)
+       datadir = "/usr/share/cups";
+ 
+@@ -2342,13 +2342,13 @@ Connection_printTestPage (Connection *se
+     file = filename;
+   }
+ 
+-  if (!title)
++  if (!titleobj)
+     title = "Test Page";
+ 
+-  if (!format)
++  if (!formatobj)
+     format = "application/postscript";
+ 
+-  if (!user)
++  if (!userobj)
+     user = "guest";
+ 
+   snprintf (uri, sizeof (uri), "ipp://localhost/printers/%s", printer);
+diff -U0 pycups-1.9.30/ChangeLog.uninit pycups-1.9.30/ChangeLog
+--- pycups-1.9.30/ChangeLog.uninit	2007-11-19 16:41:14.000000000 +0000
++++ pycups-1.9.30/ChangeLog	2007-11-21 11:18:20.000000000 +0000
+@@ -0,0 +1,7 @@
++2007-11-21  Tim Waugh  <twaugh@redhat.com>
++
++	* cupsmodule.c (cups_require): Don't read uninitialised memory.
++
++	* cupsconnection.c (Connection_printTestPage): Don't use
++	uninitialised variables (bug #390431).
++
+diff -up pycups-1.9.30/cupsmodule.c.uninit pycups-1.9.30/cupsmodule.c
+--- pycups-1.9.30/cupsmodule.c.uninit	2007-09-12 14:12:11.000000000 +0100
++++ pycups-1.9.30/cupsmodule.c	2007-11-21 11:18:20.000000000 +0000
+@@ -253,13 +253,18 @@ cups_require (PyObject *self, PyObject *
+   nreq = strtoul (preq, &end, 0);
+   while (preq != end)
+   {
+-    preq = end + 1;
++    preq = end;
++    if (*preq == '.')
++      preq++;
+ 
+     nver = strtoul (pver, &end, 0);
+     if (pver == end)
+       goto fail;
+-    else
+-      pver = end + 1;
++    else {
++      pver = end;
++      if (*pver == '.')
++	pver++;
++    }
+ 
+     if (nver < nreq)
+       goto fail;
diff --git a/system-config-printer.spec b/system-config-printer.spec
index a322cd8..5ec1eac 100644
--- a/system-config-printer.spec
+++ b/system-config-printer.spec
@@ -11,6 +11,7 @@ Source0: system-config-printer-%{version}.tar.bz2
 Source1: pycups-%{pycups_version}.tar.bz2
 Source2: system-config-printer.pam
 Source3: system-config-printer.console
+Patch0: pycups-uninit.patch
 
 BuildRequires: cups-devel >= 1.2
 BuildRequires: python-devel >= 2.4
@@ -52,6 +53,9 @@ the configuration tool.
 
 %prep
 %setup -q -a 1
+pushd pycups-%{pycups_version}
+%patch0 -p1 -b .uninit
+popd
 
 %build
 %configure
@@ -122,6 +126,10 @@ rm -rf %buildroot
 exit 0
 
 %changelog
+* Wed Nov 21 2007 Tim Waugh <twaugh@redhat.com>
+- Applied patch to pycups to avoid reading uninitialised
+  memory (bug #390431).
+
 * Mon Nov 19 2007 Tim Waugh <twaugh@redhat.com>
 - Updated pycups to 1.9.30.