gnutls: patch CVE-2025-32988

Pick relevant commit from 3.8.10 release MR [1].

[1] https://gitlab.com/gnutls/gnutls/-/merge_requests/1979

(From OE-Core rev: 2838dae57a1236d4f6eb97e32eb500892ba67184)

Signed-off-by: Peter Marko <peter.marko@siemens.com>
Signed-off-by: Steve Sakoman <steve@sakoman.com>

meta/recipes-support/gnutls/gnutls/CVE-2025-32988.patch

@@ -0,0 +1,58 @@
+From 608829769cbc247679ffe98841109fc73875e573 Mon Sep 17 00:00:00 2001
+From: Daiki Ueno <ueno@gnu.org>
+Date: Mon, 7 Jul 2025 10:44:12 +0900
+Subject: [PATCH] x509: avoid double free when exporting othernames in SAN
+
+Previously, the _gnutls_write_new_othername function, called by
+gnutls_x509_ext_export_subject_alt_names to export "otherName" in a
+certificate's SAN extension, freed the caller allocated ASN.1
+structure upon error, resulting in a potential double-free.
+
+Reported by OpenAI Security Research Team.
+
+Signed-off-by: Daiki Ueno <ueno@gnu.org>
+
+CVE: CVE-2025-32988
+Upstream-Status: Backport [https://gitlab.com/gnutls/gnutls/-/commit/608829769cbc247679ffe98841109fc73875e573]
+Signed-off-by: Peter Marko <peter.marko@siemens.com>
+---
+ NEWS                  | 5 +++++
+ lib/x509/extensions.c | 2 --
+ 2 files changed, 5 insertions(+), 2 deletions(-)
+
+diff --git a/NEWS b/NEWS
+index 025e05148..ff289fa75 100644
+--- a/NEWS
++++ b/NEWS
+@@ -10,6 +10,11 @@ See the end for copying conditions.
+    and fix developed by Andrew Hamilton. [GNUTLS-SA-2025-07-07-1,
+    CVSS: medium] [CVE-2025-32989]
+ 
++** libgnutls: Fix double-free upon error when exporting otherName in SAN
++   Reported by OpenAI Security Research Team. [GNUTLS-SA-2025-07-07-2,
++   CVSS: low] [CVE-2025-32988]
++
++
+ * Version 3.8.4 (released 2024-03-18)
+ 
+ ** libgnutls: RSA-OAEP encryption scheme is now supported
+diff --git a/lib/x509/extensions.c b/lib/x509/extensions.c
+index 6c2da8fd1..e8be12eaf 100644
+--- a/lib/x509/extensions.c
++++ b/lib/x509/extensions.c
+@@ -754,7 +754,6 @@ int _gnutls_write_new_othername(asn1_node ext, const char *ext_name,
+ 	result = asn1_write_value(ext, name2, oid, 1);
+ 	if (result != ASN1_SUCCESS) {
+ 		gnutls_assert();
+-		asn1_delete_structure(&ext);
+ 		return _gnutls_asn2err(result);
+ 	}
+ 
+@@ -763,7 +762,6 @@ int _gnutls_write_new_othername(asn1_node ext, const char *ext_name,
+ 	result = asn1_write_value(ext, name2, data, data_size);
+ 	if (result != ASN1_SUCCESS) {
+ 		gnutls_assert();
+-		asn1_delete_structure(&ext);
+ 		return _gnutls_asn2err(result);
+ 	}
+ 

meta/recipes-support/gnutls/gnutls_3.8.4.bb

@@ -30,6 +30,7 @@ SRC_URI = "https://www.gnupg.org/ftp/gcrypt/gnutls/v${SHRT_VER}/gnutls-${PV}.tar
            file://5477db1bb507a35e8833c758ce344f4b5b246d8e \
            file://0001-x509-reject-zero-length-version-in-certificate-reque.patch \
            file://3e94dcdff862ef5d6db8b5cc8e59310b5f0cdfe2 \
+           file://CVE-2025-32988.patch \
            "
 
 SRC_URI[sha256sum] = "2bea4e154794f3f00180fa2a5c51fe8b005ac7a31cd58bd44cdfa7f36ebc3a9b"