diff options
Diffstat (limited to 'drivers/s390/crypto')
| -rw-r--r-- | drivers/s390/crypto/zcrypt_api.c | 12 |
1 files changed, 10 insertions, 2 deletions
diff --git a/drivers/s390/crypto/zcrypt_api.c b/drivers/s390/crypto/zcrypt_api.c index 7fca9c10ffc..8e65447f76b 100644 --- a/drivers/s390/crypto/zcrypt_api.c +++ b/drivers/s390/crypto/zcrypt_api.c @@ -396,8 +396,15 @@ static long zcrypt_rsa_crt(struct ica_rsa_modexpo_crt *crt) if (copied == 0) { unsigned int len; spin_unlock_bh(&zcrypt_device_lock); - /* len is max 256 / 2 - 120 = 8 */ - len = crt->inputdatalength / 2 - 120; + /* len is max 256 / 2 - 120 = 8 + * For bigger device just assume len of leading + * 0s is 8 as stated in the requirements for + * ica_rsa_modexpo_crt struct in zcrypt.h. + */ + if (crt->inputdatalength <= 256) + len = crt->inputdatalength / 2 - 120; + else + len = 8; if (len > sizeof(z1)) return -EFAULT; z1 = z2 = z3 = 0; @@ -405,6 +412,7 @@ static long zcrypt_rsa_crt(struct ica_rsa_modexpo_crt *crt) copy_from_user(&z2, crt->bp_key, len) || copy_from_user(&z3, crt->u_mult_inv, len)) return -EFAULT; + z1 = z2 = z3 = 0; copied = 1; /* * We have to restart device lookup - |