From d7fb19dca20b7ad30da95d43cbdb9aa2d3714a0d Mon Sep 17 00:00:00 2001
From: AZero13 <gfunni234@gmail.com>
Date: Mon, 3 Nov 2025 19:55:13 -0500
Subject: [PATCH] Do not allow negative file descriptors to be closed

Especially
---
 backend/lpd.c          | 4 ++--
 filter/rastertoepson.c | 2 +-
 filter/rastertohp.c    | 2 +-
 filter/rastertolabel.c | 2 +-
 filter/rastertopwg.c   | 2 +-
 5 files changed, 6 insertions(+), 6 deletions(-)

diff --git a/backend/lpd.c b/backend/lpd.c
index bc13c6f6bf..6a5f32ad66 100644
--- a/backend/lpd.c
+++ b/backend/lpd.c
@@ -523,7 +523,7 @@ main(int  argc,				/* I - Number of command-line arguments (6 or 7) */
   if (tmpfilename[0])
     unlink(tmpfilename);
 
-  if (fd)
+  if (fd > 0)
     close(fd);
 
   if (snmp_fd >= 0)
@@ -948,7 +948,7 @@ lpd_queue(const char      *hostname,	/* I - Host to connect to */
     * Next, open the print file and figure out its size...
     */
 
-    if (print_fd)
+    if (print_fd > 0)
     {
      /*
       * Use the size from the print file...
diff --git a/filter/rastertoepson.c b/filter/rastertoepson.c
index 644e81e5e2..9de3986935 100644
--- a/filter/rastertoepson.c
+++ b/filter/rastertoepson.c
@@ -1141,7 +1141,7 @@ main(int  argc,				/* I - Number of command-line arguments */
   */
 
   cupsRasterClose(ras);
-  if (fd != 0)
+  if (fd > 0)
     close(fd);
 
  /*
diff --git a/filter/rastertohp.c b/filter/rastertohp.c
index d2743b2dd2..bb942c3595 100644
--- a/filter/rastertohp.c
+++ b/filter/rastertohp.c
@@ -813,7 +813,7 @@ main(int  argc,				/* I - Number of command-line arguments */
   */
 
   cupsRasterClose(ras);
-  if (fd != 0)
+  if (fd > 0)
     close(fd);
 
  /*
diff --git a/filter/rastertolabel.c b/filter/rastertolabel.c
index 8f75e9a176..e196b8685b 100644
--- a/filter/rastertolabel.c
+++ b/filter/rastertolabel.c
@@ -1263,7 +1263,7 @@ main(int  argc,				/* I - Number of command-line arguments */
   */
 
   cupsRasterClose(ras);
-  if (fd != 0)
+  if (fd > 0)
     close(fd);
 
  /*
diff --git a/filter/rastertopwg.c b/filter/rastertopwg.c
index 9c50f71a74..6ef0975d25 100644
--- a/filter/rastertopwg.c
+++ b/filter/rastertopwg.c
@@ -490,7 +490,7 @@ main(int  argc,				/* I - Number of command-line args */
   }
 
   cupsRasterClose(inras);
-  if (fd)
+  if (fd > 0)
     close(fd);
 
   cupsRasterClose(outras);
-- 
2.47.3