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don't write beyond buffer

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Submitted by: Nils Larsch
This commit is contained in:
Bodo Möller 2002-08-27 13:32:35 +00:00
parent e2aeb8174b
commit c237de058f
1 changed files with 5 additions and 1 deletions
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6
crypto/bn/bn_gf2m.c
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@ -370,12 +370,16 @@ int BN_GF2m_mod_arr(BIGNUM *r, const BIGNUM *a, const unsigned int p[])
for (k = 1; p[k] > 0; k++)
{
BN_ULONG tmp_ulong;
/* reducing component t^p[k]*/
n = p[k] / BN_BITS2;
d0 = p[k] % BN_BITS2;
d1 = BN_BITS2 - d0;
z[n] ^= (zz << d0);
if (d0) z[n+1] ^= (zz >> d1);
tmp_ulong = zz >> d1;
if (d0 && tmp_ulong)
z[n+1] ^= tmp_ulong;
}