cups: Fix CVE-2023-4504

(From OE-Core rev: dc5c06da7a793e85276ce8ce9de1c06decb6e133)

Signed-off-by: Lee Chee Yang <chee.yang.lee@intel.com>
Signed-off-by: Steve Sakoman <steve@sakoman.com>

meta/recipes-extended/cups/cups.inc

@@ -18,6 +18,7 @@ SRC_URI = "https://github.com/OpenPrinting/cups/releases/download/v${PV}/cups-${
            file://CVE-2023-32324.patch \
            file://CVE-2023-34241.patch \
 	   file://CVE-2023-32360.patch \
+	   file://CVE-2023-4504.patch \
            "
 
 UPSTREAM_CHECK_URI = "https://github.com/OpenPrinting/cups/releases"

meta/recipes-extended/cups/cups/CVE-2023-4504.patch

@@ -0,0 +1,42 @@
+CVE: CVE-2023-4504
+Upstream-Status: Backport [https://github.com/OpenPrinting/cups/commit/2431caddb7e6a87f04ac90b5c6366ad268b6ff31 ]
+Signed-off-by: Lee Chee Yang <chee.yang.lee@intel.com>
+
+From 2431caddb7e6a87f04ac90b5c6366ad268b6ff31 Mon Sep 17 00:00:00 2001
+From: Zdenek Dohnal <zdohnal@redhat.com>
+Date: Wed, 20 Sep 2023 14:45:17 +0200
+Subject: [PATCH] raster-interpret.c: Fix CVE-2023-4504
+
+We didn't check for end of buffer if it looks there is an escaped
+character - check for NULL terminator there and if found, return NULL
+as return value and in `ptr`, because a lone backslash is not
+a valid PostScript character.
+---
+ cups/raster-interpret.c | 14 +++++++++++++-
+ 1 files changed, 13 insertions(+), 1 deletion(-)
+
+diff --git a/cups/raster-interpret.c b/cups/raster-interpret.c
+index 6fcf731b5..b8655c8c6 100644
+--- a/cups/raster-interpret.c
++++ b/cups/raster-interpret.c
+@@ -1116,7 +1116,19 @@ scan_ps(_cups_ps_stack_t *st,		/* I  - Stack */
+ 
+ 	    cur ++;
+ 
+-            if (*cur == 'b')
++	   /*
++	    * Return NULL if we reached NULL terminator, a lone backslash
++	    * is not a valid character in PostScript.
++	    */
++
++	    if (!*cur)
++	    {
++	      *ptr = NULL;
++
++	      return (NULL);
++	    }
++
++	    if (*cur == 'b')
+ 	      *valptr++ = '\b';
+ 	    else if (*cur == 'f')
+ 	      *valptr++ = '\f';