From 4b797282c23450406c2dc73aea051b4b85589b8d Mon Sep 17 00:00:00 2001
From: Bernd Edlinger <bernd.edlinger@hotmail.de>
Date: Tue, 13 Jun 2017 18:08:40 +0200
Subject: [PATCH] Fix crash in ecdh_simple_compute_key.

Reviewed-by: Matt Caswell <matt@openssl.org>
Reviewed-by: Rich Salz <rsalz@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/3671)
(cherry picked from commit abea494cf75061650deecf584adc2cd293ce322d)
---
 crypto/ec/ecdh_ossl.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/crypto/ec/ecdh_ossl.c b/crypto/ec/ecdh_ossl.c
index caf65de8c4..a865145974 100644
--- a/crypto/ec/ecdh_ossl.c
+++ b/crypto/ec/ecdh_ossl.c
@@ -66,6 +66,10 @@ int ecdh_simple_compute_key(unsigned char **pout, size_t *poutlen,
     BN_CTX_start(ctx);
     x = BN_CTX_get(ctx);
     y = BN_CTX_get(ctx);
+    if (y == NULL) {
+        ECerr(EC_F_ECDH_SIMPLE_COMPUTE_KEY, ERR_R_MALLOC_FAILURE);
+        goto err;
+    }
 
     priv_key = EC_KEY_get0_private_key(ecdh);
     if (priv_key == NULL) {
-- 
2.25.1