Subject: Openssl: handle NULL in jose_openssl_jwk_from_EC_KEY gracefully (#172)
Origin: upstream, commit v14-7-g5aaaaf6 <https://github.com/latchset/jose/commit/v14-7-g5aaaaf6>
Author: Ahmad Fatoum <ahmad@a3f.at>
Date: Wed Jul 9 14:21:37 2025 +0200

    We already check that the RSA *key is not NULL in
    jose_openssl_jwk_from_RSA(), but fail to do so for EC_KEY *key in
    jose_openssl_jwk_from_EC_KEY().

    But EVP_PKEY_get0_EC_KEY() can return NULL too, e.g., if
    the EVP_PKEY comes from an OpenSSL provider that is not creating a
    keymgmt instance for a public key and the default provider is not
    loaded[1].

    Instead of crashing inside OpenSSL when we pass a NULL pointer to
    EC_KEY_get0_private_key(), detect this case and return gracefully.

    [1]: https://github.com/openssl/openssl/discussions/25679

    Signed-off-by: Ahmad Fatoum <a.fatoum@pengutronix.de>

--- a/lib/openssl/jwk.c
+++ b/lib/openssl/jwk.c
@@ -140,6 +140,9 @@
 json_t *
 jose_openssl_jwk_from_EC_KEY(jose_cfg_t *cfg, const EC_KEY *key)
 {
+    if (!key)
+        return NULL;
+
     return jose_openssl_jwk_from_EC_POINT(
         cfg,
         EC_KEY_get0_group(key),