gnutls: patch reject zero-length version in certificate request

Pick relevant commit from 3.8.10 release MR [1].
The MR contains referece to undiscoled issue, so any security relevant
patch should be picked.

Binary test file was added as separate file as binary diffs are not
supported.

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

(From OE-Core rev: 990bd6fab5c6004b9fbcdb9c76bcb3a96ba5887a)

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

3 files changed, 41 insertions, 1 deletions

diff --git a/meta/recipes-support/gnutls/gnutls/0001-x509-reject-zero-length-version-in-certificate-reque.patch b/meta/recipes-support/gnutls/gnutls/0001-x509-reject-zero-length-version-in-certificate-reque.patch
new file mode 100644
index 0000000000..6351bf4559
--- /dev/null
+++ b/meta/recipes-support/gnutls/gnutls/0001-x509-reject-zero-length-version-in-certificate-reque.patch
@@ -0,0 +1,37 @@
+From 61c0505634a6faacf9fa0723843408aa0d3fb90a Mon Sep 17 00:00:00 2001
+From: Andrew Hamilton <adhamilt@gmail.com>
+Date: Mon, 7 Jul 2025 10:35:54 +0900
+Subject: [PATCH] x509: reject zero-length version in certificate request
+
+Ensure zero size asn1 values are considered invalid in
+gnutls_x509_crq_get_version, this ensures crq version is not used
+uninitialized. Spotted by oss-fuzz at:
+https://issues.oss-fuzz.com/issues/42536706
+
+Signed-off-by: Andrew Hamilton <adhamilt@gmail.com>
+Signed-off-by: Daiki Ueno <ueno@gnu.org>
+
+Upstream-Status: Backport [https://gitlab.com/gnutls/gnutls/-/commit/61c0505634a6faacf9fa0723843408aa0d3fb90a]
+Signed-off-by: Peter Marko <peter.marko@siemens.com>
+---
+ lib/x509/crq.c                                    |   7 +++++++
+ 1 file changed, 7 insertions(+)
+
+diff --git a/lib/x509/crq.c b/lib/x509/crq.c
+index 19e13623c..9e9801d2b 100644
+--- a/lib/x509/crq.c
++++ b/lib/x509/crq.c
+@@ -635,6 +635,13 @@ int gnutls_x509_crq_get_version(gnutls_x509_crq_t crq)
+                return _gnutls_asn2err(result);
+        }
+ 
++       /* Note that asn1_read_value can return success with */
++       /* len set to zero (without setting the data) in some */
++       /* conditions. */
++       if (unlikely(len <= 0)) {
++               return gnutls_assert_val(GNUTLS_E_ASN1_VALUE_NOT_VALID);
++       }
++
+        return (int) version[0] + 1;
+ }
+ 
diff --git a/meta/recipes-support/gnutls/gnutls/3e94dcdff862ef5d6db8b5cc8e59310b5f0cdfe2 b/meta/recipes-support/gnutls/gnutls/3e94dcdff862ef5d6db8b5cc8e59310b5f0cdfe2
new file mode 100644
index 0000000000..23ff09c4be
--- /dev/null
+++ b/meta/recipes-support/gnutls/gnutls/3e94dcdff862ef5d6db8b5cc8e59310b5f0cdfe2
diff --git a/meta/recipes-support/gnutls/gnutls_3.7.4.bb b/meta/recipes-support/gnutls/gnutls_3.7.4.bb
index 4929e44db3..65e42c00c2 100644
--- a/meta/recipes-support/gnutls/gnutls_3.7.4.bb
+++ b/meta/recipes-support/gnutls/gnutls_3.7.4.bb
@@ -33,6 +33,8 @@ SRC_URI = "https://www.gnupg.org/ftp/gcrypt/gnutls/v${SHRT_VER}/gnutls-${PV}.tar
            file://04939b75417cc95b7372c6f208c4bda4579bdc34 \
            file://0001-psk-fix-read-buffer-overrun-in-the-pre_shared_key-ex.patch \
            file://5477db1bb507a35e8833c758ce344f4b5b246d8e \
+           file://0001-x509-reject-zero-length-version-in-certificate-reque.patch \
+           file://3e94dcdff862ef5d6db8b5cc8e59310b5f0cdfe2 \
            "
 
 SRC_URI[sha256sum] = "e6adbebcfbc95867de01060d93c789938cf89cc1d1f6ef9ef661890f6217451f"
@@ -71,9 +73,10 @@ do_configure:prepend() {
         done
 
     # binary files cannot be delivered as diff
-    mkdir -p ${S}/fuzz/gnutls_x509_parser_fuzzer.repro/ ${S}/fuzz/gnutls_psk_client_fuzzer.repro/
+    mkdir -p ${S}/fuzz/gnutls_x509_parser_fuzzer.repro/ ${S}/fuzz/gnutls_psk_client_fuzzer.repro/ ${S}/fuzz/gnutls_x509_crq_parser_fuzzer.repro/
     cp ${WORKDIR}/04939b75417cc95b7372c6f208c4bda4579bdc34 ${S}/fuzz/gnutls_x509_parser_fuzzer.repro/
     cp ${WORKDIR}/5477db1bb507a35e8833c758ce344f4b5b246d8e ${S}/fuzz/gnutls_psk_client_fuzzer.repro/
+    cp ${WORKDIR}/3e94dcdff862ef5d6db8b5cc8e59310b5f0cdfe2 ${S}/fuzz/gnutls_x509_crq_parser_fuzzer.repro/
 }
 
 PACKAGES =+ "${PN}-openssl ${PN}-xx"