Fix leak in cms_RecipientInfo_kekri_decrypt()

Free ec->key before reassigning it.

From OpenSSL 1.1.1, 58e1e397

ok inoguchi

1 files changed, 2 insertions, 1 deletions

diff --git a/src/lib/libcrypto/cms/cms_env.c b/src/lib/libcrypto/cms/cms_env.c
index 74d957eee0..a88ea63662 100644
--- a/src/lib/libcrypto/cms/cms_env.c
+++ b/src/lib/libcrypto/cms/cms_env.c
@@ -1,4 +1,4 @@
-/* $OpenBSD: cms_env.c,v 1.23 2019/10/04 18:03:56 tb Exp $ */
+/* $OpenBSD: cms_env.c,v 1.24 2021/09/08 14:33:02 tb Exp $ */
 /*
  * Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL
  * project.
@@ -792,6 +792,7 @@ cms_RecipientInfo_kekri_decrypt(CMS_ContentInfo *cms, CMS_RecipientInfo *ri)
                 goto err;
         }
 
+        freezero(ec->key, ec->keylen);
         ec->key = ukey;
         ec->keylen = ukeylen;