Ensure OSSL_PARAM_BLD_free() can accept a NULL

All OpenSSL free functions should accept NULL.

Reviewed-by: Shane Lontis <shane.lontis@oracle.com>
(Merged from https://github.com/openssl/openssl/pull/11635)

diff --git a/crypto/param_build.c b/crypto/param_build.c
index 43b194bceab53418db6b9406e2c518d28b81b1ec..76522cd3770f26a047815345c6541f4e5f25d398 100644 (file)
--- a/crypto/param_build.c
+++ b/crypto/param_build.c
@@ -125,6 +125,8 @@ static void free_all_params(OSSL_PARAM_BLD *bld)
 
 void OSSL_PARAM_BLD_free(OSSL_PARAM_BLD *bld)
 {
+    if (bld == NULL)
+        return;
     free_all_params(bld);
     sk_OSSL_PARAM_BLD_DEF_free(bld->params);
     OPENSSL_free(bld);