diff --git a/cups-str2664.patch b/cups-str2664.patch
new file mode 100644
index 0000000..8ca7ee9
--- /dev/null
+++ b/cups-str2664.patch
@@ -0,0 +1,12 @@
+diff -up cups-1.3.5/backend/runloop.c~ cups-1.3.5/backend/runloop.c
+--- cups-1.3.5/backend/runloop.c~	2007-08-22 19:34:34.000000000 +0100
++++ cups-1.3.5/backend/runloop.c	2008-01-09 15:37:44.000000000 +0000
+@@ -216,7 +216,7 @@ backendRunLoop(
+       FD_SET(CUPS_SC_FD, &input);
+ 
+     FD_ZERO(&output);
+-    if (print_bytes || !use_bc)
++    if (print_bytes || (!use_bc && !side_cb))
+       FD_SET(device_fd, &output);
+ 
+     if (use_bc || side_cb)
diff --git a/cups.spec b/cups.spec
index e9f70fd..7e6e888 100644
--- a/cups.spec
+++ b/cups.spec
@@ -46,6 +46,7 @@ Patch19: cups-eggcups.patch
 Patch20: cups-getpass.patch
 Patch21: cups-driverd-timeout.patch
 Patch22: cups-strict-ppd-line-length.patch
+Patch23: cups-str2664.patch
 Patch25: cups-usb-paperout.patch
 Patch100: cups-lspp.patch
 Epoch: 1
@@ -159,6 +160,7 @@ lpd emulation.
 %patch20 -p1 -b .getpass
 %patch21 -p1 -b .driverd-timeout
 %patch22 -p1 -b .strict-ppd-line-length
+%patch23 -p1 -b .str2664
 %patch25 -p1 -b .usb-paperout
 
 %if %lspp
@@ -451,6 +453,9 @@ rm -rf $RPM_BUILD_ROOT
 %{cups_serverbin}/daemon/cups-lpd
 
 %changelog
+* Thu Jan 10 2008 Tim Waugh <twaugh@redhat.com>
+- Apply patch to fix busy looping in the backends (bug #426653, STR #2664).
+
 * Wed Jan  9 2008 Tim Waugh <twaugh@redhat.com>
 - Apply patch to prevent overlong PPD lines from causing failures except
   in strict mode (bug #405061).  Needed for compatibility with older