Set flags to 0 before calling BN_with_flags()

BN_with_flags() will read the dest->flags to keep the BN_FLG_MALLOCED but
overwrites everything else.

Signed-off-by: Kurt Roeckx <kurt@roeckx.be>
Reviewed-by: Rich Salz <rsalz@openssl.org>
MR #1231

diff --git a/crypto/bn/bn_gcd.c b/crypto/bn/bn_gcd.c
index 17c6cf5ce37059be5a486fca278b04ece2ef6a62..02643190ef71a0cc29111659737d876219c9cd48 100644 (file)
--- a/crypto/bn/bn_gcd.c
+++ b/crypto/bn/bn_gcd.c
@@ -599,6 +599,7 @@ static BIGNUM *BN_mod_inverse_no_branch(BIGNUM *in,
          * BN_div_no_branch will be called eventually.
          */
         pB = &local_B;
+        local_B.flags = 0;
         BN_with_flags(pB, B, BN_FLG_CONSTTIME);
         if (!BN_nnmod(B, pB, A, ctx))
             goto err;
@@ -626,6 +627,7 @@ static BIGNUM *BN_mod_inverse_no_branch(BIGNUM *in,
          * BN_div_no_branch will be called eventually.
          */
         pA = &local_A;
+        local_A.flags = 0;
         BN_with_flags(pA, A, BN_FLG_CONSTTIME);
 
         /* (D, M) := (A/B, A%B) ... */