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-rw-r--r--crypto/openssl/crypto/bn/bn_gf2m.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/crypto/openssl/crypto/bn/bn_gf2m.c b/crypto/openssl/crypto/bn/bn_gf2m.c
index ae642ccb3943..5d90f1e88be2 100644
--- a/crypto/openssl/crypto/bn/bn_gf2m.c
+++ b/crypto/openssl/crypto/bn/bn_gf2m.c
@@ -607,6 +607,7 @@ int BN_GF2m_mod_inv(BIGNUM *r, const BIGNUM *a, const BIGNUM *p, BN_CTX *ctx)
{
while (!BN_is_odd(u))
{
+ if (BN_is_zero(u)) goto err;
if (!BN_rshift1(u, u)) goto err;
if (BN_is_odd(b))
{