add missing check for BN_mod_inverse

[openssl.git] / crypto / rsa / rsa_x931g.c

diff --git a/crypto/rsa/rsa_x931g.c b/crypto/rsa/rsa_x931g.c
index 3563670a12acaf06db380d034f6e1f0cd988ca3e..15e40e8d1dd733cdc65c2ada8658e821bcd18f16 100644 (file)
--- 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: