From: Mansour Ahmadi <m.ahmadi@northeastern.edu>
Date: Tue, 11 Dec 2018 20:48:08 +0000 (-0500)
Subject: add missing check for BN_mod_inverse
X-Git-Tag: OpenSSL_1_1_1b~117
X-Git-Url: https://git.librecmc.org/?a=commitdiff_plain;h=3b16099e0c8df1fd5094ad4490d87ab31516bf25;p=oweals%2Fopenssl.git

add missing check for BN_mod_inverse

Fixes #7650

Reviewed-by: Kurt Roeckx <kurt@roeckx.be>
Reviewed-by: Matt Caswell <matt@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/7876)

(cherry picked from commit 55833a8de70589a5000044b6291e190f5a3826ae)
---

diff --git a/crypto/rsa/rsa_x931g.c b/crypto/rsa/rsa_x931g.c
index 3563670a12..15e40e8d1d 100644
--- a/crypto/rsa/rsa_x931g.c
+++ b/crypto/rsa/rsa_x931g.c
@@ -128,6 +128,8 @@ int RSA_X931_derive_ex(RSA *rsa, BIGNUM *p1, BIGNUM *p2, BIGNUM *q1,
 
     /* calculate inverse of q mod p */
     rsa->iqmp = BN_mod_inverse(NULL, rsa->q, rsa->p, ctx2);
+    if (rsa->iqmp == NULL)
+        goto err;
 
     ret = 1;
  err: