Make a NULL check explicit

diff --git a/lib/libcrypto/kdf/tls1_prf.c b/lib/libcrypto/kdf/tls1_prf.c
index 1ba1e36..cefb3e2 100644 (file)
--- a/lib/libcrypto/kdf/tls1_prf.c
+++ b/lib/libcrypto/kdf/tls1_prf.c
@@ -1,4 +1,4 @@
-/*     $OpenBSD: tls1_prf.c,v 1.29 2024/07/09 17:00:59 tb Exp $ */
+/*     $OpenBSD: tls1_prf.c,v 1.30 2024/07/09 17:01:40 tb Exp $ */
 /*
  * Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL project
  * 2016.
@@ -291,7 +291,7 @@ tls1_prf_P_hash(const EVP_MD *md,
                        goto err;
                if (out_len > (size_t)chunk && !EVP_MD_CTX_copy_ex(ctx_tmp, ctx))
                        goto err;
-               if (seed && !EVP_DigestSignUpdate(ctx, seed, seed_len))
+               if (seed != NULL && !EVP_DigestSignUpdate(ctx, seed, seed_len))
                        goto err;
 
                if (out_len > (size_t)chunk) {