diff options
Diffstat (limited to 'drivers/s390')
| -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 7fca9c10ffcf..8e65447f76b7 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) | |||
| 396 | if (copied == 0) { | 396 | if (copied == 0) { |
| 397 | unsigned int len; | 397 | unsigned int len; |
| 398 | spin_unlock_bh(&zcrypt_device_lock); | 398 | spin_unlock_bh(&zcrypt_device_lock); |
| 399 | /* len is max 256 / 2 - 120 = 8 */ | 399 | /* len is max 256 / 2 - 120 = 8 |
| 400 | len = crt->inputdatalength / 2 - 120; | 400 | * For bigger device just assume len of leading |
| 401 | * 0s is 8 as stated in the requirements for | ||
| 402 | * ica_rsa_modexpo_crt struct in zcrypt.h. | ||
| 403 | */ | ||
| 404 | if (crt->inputdatalength <= 256) | ||
| 405 | len = crt->inputdatalength / 2 - 120; | ||
| 406 | else | ||
| 407 | len = 8; | ||
| 401 | if (len > sizeof(z1)) | 408 | if (len > sizeof(z1)) |
| 402 | return -EFAULT; | 409 | return -EFAULT; |
| 403 | z1 = z2 = z3 = 0; | 410 | z1 = z2 = z3 = 0; |
| @@ -405,6 +412,7 @@ static long zcrypt_rsa_crt(struct ica_rsa_modexpo_crt *crt) | |||
| 405 | copy_from_user(&z2, crt->bp_key, len) || | 412 | copy_from_user(&z2, crt->bp_key, len) || |
| 406 | copy_from_user(&z3, crt->u_mult_inv, len)) | 413 | copy_from_user(&z3, crt->u_mult_inv, len)) |
| 407 | return -EFAULT; | 414 | return -EFAULT; |
| 415 | z1 = z2 = z3 = 0; | ||
| 408 | copied = 1; | 416 | copied = 1; |
| 409 | /* | 417 | /* |
| 410 | * We have to restart device lookup - | 418 | * We have to restart device lookup - |