Fix null pointer dereference in cms_RecipientInfo_kari_init

CLA: trivial

Reviewed-by: Bernd Edlinger <bernd.edlinger@hotmail.de>
Reviewed-by: Paul Yang <yang.yang@baishancloud.com>
Reviewed-by: Richard Levitte <levitte@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/8137)

diff --git a/crypto/cms/cms_kari.c b/crypto/cms/cms_kari.c
index 4ee7017cfe1f927fdce05d929daa5be72b656acd..9f1f5d55f665089799376a43d113556c083489ba 100644 (file)
--- a/crypto/cms/cms_kari.c
+++ b/crypto/cms/cms_kari.c
@@ -282,7 +282,7 @@ static int cms_kari_create_ephemeral_key(CMS_KeyAgreeRecipientInfo *kari,
     return rv;
 }
 
-/* Initialise a ktri based on passed certificate and key */
+/* Initialise a kari based on passed certificate and key */
 
 int cms_RecipientInfo_kari_init(CMS_RecipientInfo *ri, X509 *recip,
                                 EVP_PKEY *pk, unsigned int flags)
@@ -299,6 +299,9 @@ int cms_RecipientInfo_kari_init(CMS_RecipientInfo *ri, X509 *recip,
     kari->version = 3;
 
     rek = M_ASN1_new_of(CMS_RecipientEncryptedKey);
+    if (rek == NULL)
+        return 0;
+
     if (!sk_CMS_RecipientEncryptedKey_push(kari->recipientEncryptedKeys, rek)) {
         M_ASN1_free_of(rek, CMS_RecipientEncryptedKey);
         return 0;