diff -up cups-1.4.2/scheduler/select.c.CVE-2009-3553 cups-1.4.2/scheduler/select.c

--- cups-1.4.2/scheduler/select.c.CVE-2009-3553	2009-07-15 00:07:52.000000000 +0100

+++ cups-1.4.2/scheduler/select.c	2009-11-19 12:30:39.672976150 +0000

@@ -454,7 +454,7 @@ cupsdDoSelect(long timeout)		/* I - Time

     if (fdptr->read_cb && event->filter == EVFILT_READ)

       (*(fdptr->read_cb))(fdptr->data);

-    if (fdptr->write_cb && event->filter == EVFILT_WRITE)

+    if (fdptr->use > 1 && fdptr->write_cb && event->filter == EVFILT_WRITE)

       (*(fdptr->write_cb))(fdptr->data);

     release_fd(fdptr);

@@ -499,7 +499,7 @@ cupsdDoSelect(long timeout)		/* I - Time

 	if (fdptr->read_cb && (event->events & (EPOLLIN | EPOLLERR | EPOLLHUP)))

 	  (*(fdptr->read_cb))(fdptr->data);

-	if (fdptr->write_cb && (event->events & (EPOLLOUT | EPOLLERR | EPOLLHUP)))

+	if (fdptr->use > 1 && fdptr->write_cb && (event->events & (EPOLLOUT | EPOLLERR | EPOLLHUP)))

 	  (*(fdptr->write_cb))(fdptr->data);

 	release_fd(fdptr);

@@ -590,7 +590,7 @@ cupsdDoSelect(long timeout)		/* I - Time

       if (fdptr->read_cb && (pfd->revents & (POLLIN | POLLERR | POLLHUP)))

         (*(fdptr->read_cb))(fdptr->data);

-      if (fdptr->write_cb && (pfd->revents & (POLLOUT | POLLERR | POLLHUP)))

+      if (fdptr->use > 1 && fdptr->write_cb && (pfd->revents & (POLLOUT | POLLERR | POLLHUP)))

         (*(fdptr->write_cb))(fdptr->data);

       release_fd(fdptr);

@@ -645,7 +645,7 @@ cupsdDoSelect(long timeout)		/* I - Time

       if (fdptr->read_cb && FD_ISSET(fdptr->fd, &cupsd_current_input))

         (*(fdptr->read_cb))(fdptr->data);

-      if (fdptr->write_cb && FD_ISSET(fdptr->fd, &cupsd_current_output))

+      if (fdptr->use > 1 && fdptr->write_cb && FD_ISSET(fdptr->fd, &cupsd_current_output))

         (*(fdptr->write_cb))(fdptr->data);

       release_fd(fdptr);