257     PROV_DH_CTX *srcctx = (PROV_DH_CTX *)vpdhctx;  in dh_dupctx()  local
263     dstctx = OPENSSL_zalloc(sizeof(*srcctx));  in dh_dupctx()
267     *dstctx = *srcctx;  in dh_dupctx()
274     if (srcctx->dh != NULL && !DH_up_ref(srcctx->dh))  in dh_dupctx()
277         dstctx->dh = srcctx->dh;  in dh_dupctx()
279     if (srcctx->dhpeer != NULL && !DH_up_ref(srcctx->dhpeer))  in dh_dupctx()
282         dstctx->dhpeer = srcctx->dhpeer;  in dh_dupctx()
284     if (srcctx->kdf_md != NULL && !EVP_MD_up_ref(srcctx->kdf_md))  in dh_dupctx()
287         dstctx->kdf_md = srcctx->kdf_md;  in dh_dupctx()
290     if (srcctx->kdf_ukm != NULL && srcctx->kdf_ukmlen > 0) {  in dh_dupctx()
291         dstctx->kdf_ukm = OPENSSL_memdup(srcctx->kdf_ukm,  in dh_dupctx()
292                                          srcctx->kdf_ukmlen);  in dh_dupctx()
297     if (srcctx->kdf_cekalg != NULL) {  in dh_dupctx()
298         dstctx->kdf_cekalg = OPENSSL_strdup(srcctx->kdf_cekalg);  in dh_dupctx()