1 files changed, 1 insertions, 0 deletions

diff --git a/src/lib/libcrypto/engine/hw_ubsec.c b/src/lib/libcrypto/engine/hw_ubsec.c
index 5234a08a07..6286dd851c 100644
--- a/src/lib/libcrypto/engine/hw_ubsec.c
+++ b/src/lib/libcrypto/engine/hw_ubsec.c
@@ -561,6 +561,7 @@ static int ubsec_mod_exp(BIGNUM *r, const BIGNUM *a, const BIGNUM *p,
                 UBSECerr(UBSEC_F_UBSEC_MOD_EXP, UBSEC_R_BN_EXPAND_FAIL);
                 return 0;
         }
+        memset(r->d, 0, BN_num_bytes(m));
 
         if ((fd = p_UBSEC_ubsec_open(UBSEC_KEY_DEVICE_NAME)) <= 0) {
                 fd = 0;