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path: root/drivers/s390/crypto/zcrypt_api.c
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Diffstat (limited to 'drivers/s390/crypto/zcrypt_api.c')
-rw-r--r--drivers/s390/crypto/zcrypt_api.c12
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)
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 -