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BN_GF2m_mod_inv(): check bn_wexpand return value

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Signed-off-by: Kurt Roeckx <kurt@roeckx.be>
Reviewed-by: Rich Salz <rsalz@akamai.com>

MR #1276, RT #4107

(cherry picked from commit 94b3664a52)
This commit is contained in:
Pascal Cuoq 2015-10-12 12:19:19 +02:00 committed by Kurt Roeckx
parent 200c8ed4f5
commit 9f82c7b3aa
1 changed files with 6 additions and 3 deletions
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9
crypto/bn/bn_gf2m.c
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@ -700,18 +700,21 @@ int BN_GF2m_mod_inv(BIGNUM *r, const BIGNUM *a, const BIGNUM *p, BN_CTX *ctx)
int top = p->top;
BN_ULONG *udp, *bdp, *vdp, *cdp;
bn_wexpand(u, top);
if (!bn_wexpand(u, top))
goto err;
udp = u->d;
for (i = u->top; i < top; i++)
udp[i] = 0;
u->top = top;
bn_wexpand(b, top);
if (!bn_wexpand(b, top))
goto err;
bdp = b->d;
bdp[0] = 1;
for (i = 1; i < top; i++)
bdp[i] = 0;
b->top = top;
bn_wexpand(c, top);
if (!bn_wexpand(c, top))
goto err;
cdp = c->d;
for (i = 0; i < top; i++)
cdp[i] = 0;