cups: Fix CVE-2023-32324

OpenPrinting CUPS is an open source printing system. In versions 2.4.2
and prior, a heap buffer overflow vulnerability would allow a remote
attacker to launch a denial of service (DoS) attack. A buffer overflow
vulnerability in the function `format_log_line` could allow remote
attackers to cause a DoS on the affected system. Exploitation of the
vulnerability can be triggered when the configuration file `cupsd.conf`
sets the value of `loglevel `to `DEBUG`. No known patches or
workarounds exist at time of publication.

References:
https://nvd.nist.gov/vuln/detail/CVE-2023-32324
https://security-tracker.debian.org/tracker/CVE-2023-32324

Upstream Patch:
https://github.com/OpenPrinting/cups/commit/fd8bc2d32589

(From OE-Core rev: a4bdbc82f7e5cc9a5cb603cb720f09b0216b0a0e)

Signed-off-by: Sanjay Chitroda <schitrod@cisco.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/recipes-extended/cups/cups.inc

@@ -15,6 +15,7 @@ SRC_URI = "${GITHUB_BASE_URI}/download/v${PV}/cups-${PV}-source.tar.gz \
            file://0004-cups-fix-multilib-install-file-conflicts.patch \
            file://volatiles.99_cups \
            file://cups-volatiles.conf \
+           file://CVE-2023-32324.patch \
            "
 
 GITHUB_BASE_URI = "https://github.com/OpenPrinting/cups/releases"

meta/recipes-extended/cups/cups/CVE-2023-32324.patch

@@ -0,0 +1,36 @@
+From 07cbffd11107eed3aaf1c64e35552aec20f792da Mon Sep 17 00:00:00 2001
+From: Zdenek Dohnal <zdohnal@redhat.com>
+Date: Thu, 1 Jun 2023 12:04:00 +0200
+Subject: [PATCH] cups/string.c: Return if `size` is 0 (fixes CVE-2023-32324)
+
+CVE: CVE-2023-32324
+Upstream-Status: Backport [https://github.com/OpenPrinting/cups/commit/fd8bc2d32589]
+
+(cherry picked from commit fd8bc2d32589d1fd91fe1c0521be2a7c0462109e)
+Signed-off-by: Sanjay Chitroda <schitrod@cisco.com>
+---
+ cups/string.c | 4 ++++
+ 1 file changed, 4 insertions(+)
+
+diff --git a/cups/string.c b/cups/string.c
+index 93cdad19..6ef58515 100644
+--- a/cups/string.c
++++ b/cups/string.c
+@@ -1,6 +1,7 @@
+ /*
+  * String functions for CUPS.
+  *
++ * Copyright © 2023 by OpenPrinting.
+  * Copyright © 2007-2019 by Apple Inc.
+  * Copyright © 1997-2007 by Easy Software Products.
+  *
+@@ -730,6 +731,9 @@ _cups_strlcpy(char       *dst,		/* O - Destination string */
+   size_t	srclen;			/* Length of source string */
+ 
+ 
++  if (size == 0)
++    return (0);
++
+  /*
+   * Figure out how much room is needed...
+   */