From: Vitaly Chikunov <vt@altlinux.org>
Date: Sat, 8 Jan 2022 23:25:31 +0000 (+0300)
Subject: gost_ec_keyx: Check CTX data before it's really used
X-Git-Tag: v3.0.1~10
X-Git-Url: http://wagner.pp.ru/gitweb/?a=commitdiff_plain;ds=inline;h=5dc8f91c186d88a74493c229c7afbf3eb40599a8;hp=5dc8f91c186d88a74493c229c7afbf3eb40599a8;p=openssl-gost%2Fengine.git

gost_ec_keyx: Check CTX data before it's really used

This should fix Coverity warning:

  *** CID 345243:  Null pointer dereferences  (REVERSE_INULL)
  /gost_ec_keyx.c: 681 in pkey_gost2018_decrypt()
  675        o  Q_eph is on the same curve as server public key;
  676
  677        o  Q_eph is not equal to zero point;
  678
  679        o  q * Q_eph is not equal to zero point.
  680     */
  >>>     CID 345243:  Null pointer dereferences  (REVERSE_INULL)
  >>>     Null-checking "data" suggests that it may be null, but it has already been dereferenced on all paths leading to the check.
  681         if (eph_key == NULL || priv == NULL || data == NULL) {
  682            GOSTerr(GOST_F_PKEY_GOST2018_DECRYPT,
  683                    GOST_R_ERROR_COMPUTING_EXPORT_KEYS);
  684            ret = 0;
  685            goto err;
  686         }

Signed-off-by: Vitaly Chikunov <vt@altlinux.org>
Issue: #380
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