Clean premaster_secret for GOST

Ensure OPENSSL_cleanse() is called on the premaster secret value calculated for GOST.

With thanks to the Open Crypto Audit Project for reporting this issue.

Reviewed-by: Rich Salz <rsalz@openssl.org>
(cherry picked from commit b7ee4815f2452c854cc859e8dda88f2673cdddea)

Conflicts:
	ssl/s3_srvr.c

diff --git a/ssl/s3_srvr.c b/ssl/s3_srvr.c
index de984c85d3ca0561a30edd06ef8ab157f464c3ae..8885694c02b34522d8acb980727c4a7841716993 100644 (file)
--- a/ssl/s3_srvr.c
+++ b/ssl/s3_srvr.c
@@ -2902,6 +2902,7 @@ int ssl3_get_client_key_exchange(SSL *s)
                                                         s->
                                                         session->master_key,
                                                         premaster_secret, 32);
+        OPENSSL_cleanse(premaster_secret, sizeof(premaster_secret));
         /* Check if pubkey from client certificate was used */
         if (EVP_PKEY_CTX_ctrl
             (pkey_ctx, -1, -1, EVP_PKEY_CTRL_PEER_KEY, 2, NULL) > 0)