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Set flags to 0 before calling BN_with_flags()

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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

(cherry picked from commit f92768e6f5)
This commit is contained in:
Pascal Cuoq 2015-05-06 11:31:27 +02:00 committed by Kurt Roeckx
parent a0ba92ccde
commit 11ca27c912
1 changed files with 2 additions and 0 deletions
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2
crypto/bn/bn_gcd.c
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@ -583,6 +583,7 @@ static BIGNUM *BN_mod_inverse_no_branch(BIGNUM *in,
* BN_div_no_branch will be called eventually. * BN_div_no_branch will be called eventually.
*/ */
pB = &local_B; pB = &local_B;
local_B.flags = 0;
BN_with_flags(pB, B, BN_FLG_CONSTTIME); BN_with_flags(pB, B, BN_FLG_CONSTTIME);
if (!BN_nnmod(B, pB, A, ctx)) if (!BN_nnmod(B, pB, A, ctx))
goto err; goto err;
@ -610,6 +611,7 @@ static BIGNUM *BN_mod_inverse_no_branch(BIGNUM *in,
* BN_div_no_branch will be called eventually. * BN_div_no_branch will be called eventually.
*/ */
pA = &local_A; pA = &local_A;
local_A.flags = 0;
BN_with_flags(pA, A, BN_FLG_CONSTTIME); BN_with_flags(pA, A, BN_FLG_CONSTTIME);
/* (D, M) := (A/B, A%B) ... */ /* (D, M) := (A/B, A%B) ... */