diff options
Diffstat (limited to 'crypto/openssl/crypto/bn/bn_gf2m.c')
| -rw-r--r-- | crypto/openssl/crypto/bn/bn_gf2m.c | 15 |
1 files changed, 10 insertions, 5 deletions
diff --git a/crypto/openssl/crypto/bn/bn_gf2m.c b/crypto/openssl/crypto/bn/bn_gf2m.c index aeee49a0156f..a0ba8de31ad4 100644 --- a/crypto/openssl/crypto/bn/bn_gf2m.c +++ b/crypto/openssl/crypto/bn/bn_gf2m.c @@ -694,9 +694,10 @@ int BN_GF2m_mod_inv(BIGNUM *r, const BIGNUM *a, const BIGNUM *p, BN_CTX *ctx) } # else { - int i, ubits = BN_num_bits(u), vbits = BN_num_bits(v), /* v is copy - * of p */ - top = p->top; + int i; + int ubits = BN_num_bits(u); + int vbits = BN_num_bits(v); /* v is copy of p */ + int top = p->top; BN_ULONG *udp, *bdp, *vdp, *cdp; bn_wexpand(u, top); @@ -740,8 +741,12 @@ int BN_GF2m_mod_inv(BIGNUM *r, const BIGNUM *a, const BIGNUM *p, BN_CTX *ctx) ubits--; } - if (ubits <= BN_BITS2 && udp[0] == 1) - break; + if (ubits <= BN_BITS2) { + if (udp[0] == 0) /* poly was reducible */ + goto err; + if (udp[0] == 1) + break; + } if (ubits < vbits) { i = ubits; |