1 files changed, 2 insertions, 1 deletions

diff --git a/src/lib/libcrypto/bn/bn_exp.c b/src/lib/libcrypto/bn/bn_exp.c
index 70a33f0d93..d9b6c737fc 100644
--- a/src/lib/libcrypto/bn/bn_exp.c
+++ b/src/lib/libcrypto/bn/bn_exp.c
@@ -134,7 +134,8 @@ int BN_exp(BIGNUM *r, const BIGNUM *a, const BIGNUM *p, BN_CTX *ctx)
                 rr = BN_CTX_get(ctx);
         else
                 rr = r;
-        if ((v = BN_CTX_get(ctx)) == NULL) goto err;
+        v = BN_CTX_get(ctx);
+        if (rr == NULL || v == NULL) goto err;
 
         if (BN_copy(v,a) == NULL) goto err;
         bits=BN_num_bits(p);