Add NULL checks to HKDF and TLS1-PRF EVP_PKEY cleanup functions

Check if ctx->data is NULL before calling freezero(). Also add
HKDF and TLS1-PRF to the EVP_PKEY cleanup regression test, as
they no longer crash with this change.

ok tb@

1 files changed, 4 insertions, 1 deletions

diff --git a/src/lib/libcrypto/kdf/tls1_prf.c b/src/lib/libcrypto/kdf/tls1_prf.c
index fb7b718339..2b86ff744f 100644
--- a/src/lib/libcrypto/kdf/tls1_prf.c
+++ b/src/lib/libcrypto/kdf/tls1_prf.c
@@ -1,4 +1,4 @@
-/*      $OpenBSD: tls1_prf.c,v 1.41 2025/05/10 05:54:38 tb Exp $ */
+/*      $OpenBSD: tls1_prf.c,v 1.42 2025/05/21 03:53:20 kenjiro Exp $ */
 /*
  * Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL project
  * 2016.
@@ -96,6 +96,9 @@ pkey_tls1_prf_cleanup(EVP_PKEY_CTX *ctx)
 {
         struct tls1_prf_ctx *kctx = ctx->data;
 
+        if (kctx == NULL)
+                return;
+
         freezero(kctx->secret, kctx->secret_len);
         freezero(kctx, sizeof(*kctx));
 }