1 files changed, 2 insertions, 1 deletions

diff --git a/src/lib/libcrypto/bn/bn_exp2.c b/src/lib/libcrypto/bn/bn_exp2.c
index b3f43cec8c..bd0c34b91b 100644
--- a/src/lib/libcrypto/bn/bn_exp2.c
+++ b/src/lib/libcrypto/bn/bn_exp2.c
@@ -301,7 +301,8 @@ int BN_mod_exp2_mont(BIGNUM *rr, const BIGNUM *a1, const BIGNUM *p1,
                         r_is_one = 0;
                         }
                 }
-        BN_from_montgomery(rr,r,mont,ctx);
+        if (!BN_from_montgomery(rr,r,mont,ctx))
+                goto err;
         ret=1;
 err:
         if ((in_mont == NULL) && (mont != NULL)) BN_MONT_CTX_free(mont);