cups: allow unknown directives in conf files

Patch for CVE-2025-61915 by mistake causes fatal error on unknown
directives in configuration files.
The default configuration already contains unknown directive in
non-systemd setups:
Unknown directive IdleExitTimeout on line 32 of /etc/cups/cupsd.conf

Backport fix for this from 2.4.x branch which reverts this behavior.

(From OE-Core rev: 2f36a12a72cf1f91a2d6ee68bd04292979608eb9)

Signed-off-by: Peter Marko <peter.marko@siemens.com>
Signed-off-by: Steve Sakoman <steve@sakoman.com>
Signed-off-by: Paul Barker <paul@pbarker.dev>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

2 files changed, 44 insertions, 0 deletions

diff --git a/meta/recipes-extended/cups/cups.inc b/meta/recipes-extended/cups/cups.inc
index 12668ca023..c7475d2b81 100644
--- a/meta/recipes-extended/cups/cups.inc
+++ b/meta/recipes-extended/cups/cups.inc
@@ -19,6 +19,7 @@ SRC_URI = "${GITHUB_BASE_URI}/download/v${PV}/cups-${PV}-source.tar.gz \
            file://CVE-2025-58364.patch \
            file://CVE-2025-58436.patch \
            file://CVE-2025-61915.patch \
+           file://0001-conf.c-Fix-stopping-scheduler-on-unknown-directive.patch \
            "
 
 GITHUB_BASE_URI = "https://github.com/OpenPrinting/cups/releases"
diff --git a/meta/recipes-extended/cups/cups/0001-conf.c-Fix-stopping-scheduler-on-unknown-directive.patch b/meta/recipes-extended/cups/cups/0001-conf.c-Fix-stopping-scheduler-on-unknown-directive.patch
new file mode 100644
index 0000000000..cf01c82cd6
--- /dev/null
+++ b/meta/recipes-extended/cups/cups/0001-conf.c-Fix-stopping-scheduler-on-unknown-directive.patch
@@ -0,0 +1,43 @@
+From 277d3b1c49895f070bbf4b73cada011d71fbf9f3 Mon Sep 17 00:00:00 2001
+From: Zdenek Dohnal <zdohnal@redhat.com>
+Date: Thu, 4 Dec 2025 09:04:37 +0100
+Subject: [PATCH] conf.c: Fix stopping scheduler on unknown directive
+
+Change the return value to do not trigger stopping the scheduler in case
+of unknown directive, because stopping the scheduler on config errors
+should only happen in case of syntax errors.
+
+Upstream-Status: Backport [https://github.com/OpenPrinting/cups/commit/277d3b1c49895f070bbf4b73cada011d71fbf9f3]
+Signed-off-by: Peter Marko <peter.marko@siemens.com>
+---
+ scheduler/conf.c | 14 +++++++-------
+ 1 file changed, 7 insertions(+), 7 deletions(-)
+
+diff --git a/scheduler/conf.c b/scheduler/conf.c
+index 7d6da0252..0e7be0ef4 100644
+--- a/scheduler/conf.c
++++ b/scheduler/conf.c
+@@ -2697,16 +2697,16 @@ parse_variable(
+   {
+    /*
+     * Unknown directive!  Output an error message and continue...
++    *
++    * Return value 1 is on purpose - we ignore unknown directives to log
++    * error, but do not stop the scheduler in case error in configuration
++    * is set to be fatal.
+     */
+ 
+-    if (!value)
+-      cupsdLogMessage(CUPSD_LOG_ERROR, "Missing value for %s on line %d of %s.",
+-                     line, linenum, filename);
+-    else
+-      cupsdLogMessage(CUPSD_LOG_ERROR, "Unknown directive %s on line %d of %s.",
+-                     line, linenum, filename);
++    cupsdLogMessage(CUPSD_LOG_ERROR, "Unknown directive %s on line %d of %s.",
++                   line, linenum, filename);
+ 
+-    return (0);
++    return (1);
+   }
+ 
+   switch (var->type)