From e0deb2a6478d01e7de27b9f704f580e49ed9ff7b Mon Sep 17 00:00:00 2001
From: se-prok <81800148+se-prok@users.noreply.github.com>
Date: Fri, 2 Apr 2021 10:51:28 +0300
Subject: [PATCH] Update gost_ec_keyx.c

It's not right to have segmentation faults.
---
 gost_ec_keyx.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/gost_ec_keyx.c b/gost_ec_keyx.c
index d7fef31..955858c 100644
--- a/gost_ec_keyx.c
+++ b/gost_ec_keyx.c
@@ -804,6 +804,13 @@ static int pkey_gost2018_decrypt(EVP_PKEY_CTX *pctx, unsigned char *key,
 
    o  q * Q_eph is not equal to zero point.
 */
+    if (eph_key == NULL || priv == NULL || data == NULL) {
+       GOSTerr(GOST_F_PKEY_GOST2018_DECRYPT,
+               GOST_R_ERROR_COMPUTING_EXPORT_KEYS);
+       ret = 0;
+       goto err;
+    }
+  
     if (data->shared_ukm_size == 0 && pst->ukm != NULL) {
         if (EVP_PKEY_CTX_ctrl(pctx, -1, -1, EVP_PKEY_CTRL_SET_IV,
         ASN1_STRING_length(pst->ukm), (void *)ASN1_STRING_get0_data(pst->ukm)) < 0) {
-- 
2.39.5