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bn/bn_lib.c: remove bn_check_top from bn_expand2.

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Trouble is that addition is postponing expansion till carry is
calculated, and if addition carries, top word can be zero, which
triggers assertion in bn_check_top.

Reviewed-by: Rich Salz <rsalz@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/6810)

(cherry picked from commit e42395e637c3507b80b25c7ed63236898822d2f1)

Resolved conflicts:
	crypto/bn/bn_lib.c
This commit is contained in:
Andy Polyakov 2018-07-06 13:16:40 +02:00
parent d69f31fcc3
commit 7cca1f96bf
1 changed files with 0 additions and 5 deletions
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crypto/bn/bn_lib.c
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@ -263,8 +263,6 @@ static BN_ULONG *bn_expand_internal(const BIGNUM *b, int words)
const BN_ULONG *B;
int i;
bn_check_top(b);
if (words > (INT_MAX / (4 * BN_BITS2))) {
BNerr(BN_F_BN_EXPAND_INTERNAL, BN_R_BIGNUM_TOO_LONG);
return NULL;
@ -398,8 +396,6 @@ BIGNUM *bn_dup_expand(const BIGNUM *b, int words)
BIGNUM *bn_expand2(BIGNUM *b, int words)
{
bn_check_top(b);
if (words > b->dmax) {
BN_ULONG *a = bn_expand_internal(b, words);
if (!a)
@ -433,7 +429,6 @@ BIGNUM *bn_expand2(BIGNUM *b, int words)
assert(A == &(b->d[b->dmax]));
}
#endif
bn_check_top(b);
return b;
}