gnuplot: fix CVE-2025-31177

CVE-2025-31177:
gnuplot is affected by a heap buffer overflow at function utf8_copy_one.

Reference:
[https://nvd.nist.gov/vuln/detail/CVE-2025-31177]

Upstream patches:
[https://sourceforge.net/p/gnuplot/gnuplot-main/ci/226809aebb345e74d371bb43a2b434b490be527a/]

Signed-off-by: Zhang Peng <peng.zhang1.cn@windriver.com>
Signed-off-by: Anuj Mittal <anuj.mittal@intel.com>

meta-oe/recipes-extended/gnuplot/gnuplot/CVE-2025-31177.patch

@@ -0,0 +1,40 @@
+From 36a4355010a81a78cf9df03d3c76dcd599ed994b Mon Sep 17 00:00:00 2001
+From: Ethan A Merritt <merritt@u.washington.edu>
+Date: Wed, 15 Jan 2025 11:56:13 -0800
+Subject: [PATCH] dumb:  more stringent tests against y bound of dumb terminal
+ charcell array
+
+Bug 2756
+
+CVE: CVE-2025-31177
+Upstream-Status: Backport [https://sourceforge.net/p/gnuplot/gnuplot-main/ci/226809aebb345e74d371bb43a2b434b490be527a/]
+Signed-off-by: Zhang Peng <peng.zhang1.cn@windriver.com>
+---
+ term/dumb.trm | 4 ++--
+ 1 file changed, 2 insertions(+), 2 deletions(-)
+
+diff --git a/term/dumb.trm b/term/dumb.trm
+index c93afb94e..bb22ca25f 100644
+--- a/term/dumb.trm
++++ b/term/dumb.trm
+@@ -637,7 +637,7 @@ DUMB_put_text(unsigned int x, unsigned int y, const char *str)
+ {
+     int i, length;
+ 
+-    if (y > dumb_ymax)
++    if (y < 0 || y > dumb_ymax)
+ 	return;
+ 
+     length = gp_strlen(str);
+@@ -784,7 +784,7 @@ ENHdumb_FLUSH()
+ 	y += i;
+ 
+ 	/* print the string fragment, perhaps invisibly */
+-	if (ENHdumb_show && y < dumb_ymax) {
++	if (ENHdumb_show && (0 <= y && y < dumb_ymax)) {
+ #ifdef DUMB_UTF8
+ 	    for (i = 0; i < len && x < dumb_xmax; i++, x++) {
+ 		utf8_copy_one( (char *)(&DUMB_PIXEL(x, y)), gp_strchrn(str,i));
+-- 
+2.43.0
+

meta-oe/recipes-extended/gnuplot/gnuplot_5.4.3.bb

@@ -17,6 +17,7 @@ SRC_URI = "${SOURCEFORGE_MIRROR}/project/${BPN}/${BPN}/${PV}/${BP}.tar.gz;name=a
            file://gnuplot.png \
            file://CVE-2025-3359.patch \
            file://CVE-2025-31176.patch \
+           file://CVE-2025-31177.patch \
            "
 SRC_URI:append:class-target = " \
     file://0002-do-not-build-demos.patch \