vko: fix possible unitilized scalar access

Fix error path in _gnutls_gost_keytrans_decrypt. If
_asn1_strict_der_decode() fails, cleanup path will try to
gnutls_pk_params_release(&pub), which will access unitialized pub
variable. Fix by deleting asn1 sctructure directly.

Signed-off-by: Dmitry Eremin-Solenikov <dbaryshkov@gmail.com>

1 files changed, 3 insertions, 1 deletions

diff --git a/lib/vko.c b/lib/vko.c
index a419390ffa..f8aa80dfc7 100644
--- a/lib/vko.c
+++ b/lib/vko.c
@@ -197,7 +197,9 @@ _gnutls_gost_keytrans_decrypt(gnutls_pk_params_st *priv,
 	if (ret != ASN1_SUCCESS) {
 		gnutls_assert();
 		ret = _gnutls_asn2err(ret);
-		goto cleanup;
+		asn1_delete_structure(&kx);
+
+		return ret;
 	}
 
 	ret = _gnutls_get_asn_mpis(kx,