Fix eckey_priv_encode()

Fix eckey_priv_encode to return an error on failure of i2d_ECPrivateKey.

CHANGES

@@ -4,6 +4,10 @@
 
  Changes between 1.0.2 and 1.1.0  [xx XXX xxxx]
 
+  *) Fix eckey_priv_encode so it immediately returns an error upon a failure
+     in i2d_ECPrivateKey.
+     [mancha <mancha1@zoho.com>]
+
   *) Fix some double frees. These are not thought to be exploitable.
      [mancha <mancha1@zoho.com>]
 

crypto/ec/ec_ameth.c

@@ -356,6 +356,7 @@ static int eckey_priv_encode(PKCS8_PRIV_KEY_INFO *p8, const EVP_PKEY *pkey)
 		EC_KEY_set_enc_flags(ec_key, old_flags);
 		OPENSSL_free(ep);
 		ECerr(EC_F_ECKEY_PRIV_ENCODE, ERR_R_EC_LIB);
+		return 0;
 	}
 	/* restore old encoding flags */
 	EC_KEY_set_enc_flags(ec_key, old_flags);