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[S390] zcrypt: Rework length parameter checking. 

Fix length checking of the expected reply and remove re-adjustment of
expected control block length.

Signed-off-by: Holger Dengler <hd@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Holger Dengler 2011-12-27 11:27:19 +01:00 committed by Martin Schwidefsky
parent aa33c8cbba
commit 7fe6f0970c
1 changed files with 6 additions and 18 deletions
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24
drivers/s390/crypto/zcrypt_pcixcc.c
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@ -56,11 +56,6 @@
#define PCIXCC_MAX_ICA_RESPONSE_SIZE 0x77c /* max size type86 v2 reply */
#define PCIXCC_MAX_XCRB_MESSAGE_SIZE (12*1024)
#define PCIXCC_MAX_XCRB_RESPONSE_SIZE PCIXCC_MAX_XCRB_MESSAGE_SIZE
#define PCIXCC_MAX_XCRB_DATA_SIZE (11*1024)
#define PCIXCC_MAX_XCRB_REPLY_SIZE (5*1024)
#define PCIXCC_MAX_RESPONSE_SIZE PCIXCC_MAX_XCRB_RESPONSE_SIZE
#define PCIXCC_CLEANUP_TIME (15*HZ)
@ -296,18 +291,11 @@ static int XCRB_msg_to_type6CPRB_msgX(struct zcrypt_device *zdev,
xcRB->request_data_length;
if (ap_msg->length > PCIXCC_MAX_XCRB_MESSAGE_SIZE)
return -EFAULT;
if (CEIL4(xcRB->reply_control_blk_length) > PCIXCC_MAX_XCRB_REPLY_SIZE)
replylen = sizeof(struct type86_fmt2_msg) +
CEIL4(xcRB->reply_control_blk_length) +
xcRB->reply_data_length;
if (replylen > PCIXCC_MAX_XCRB_MESSAGE_SIZE)
return -EFAULT;
if (CEIL4(xcRB->reply_data_length) > PCIXCC_MAX_XCRB_DATA_SIZE)
return -EFAULT;
replylen = CEIL4(xcRB->reply_control_blk_length) +
CEIL4(xcRB->reply_data_length) +
sizeof(struct type86_fmt2_msg);
if (replylen > PCIXCC_MAX_XCRB_RESPONSE_SIZE) {
xcRB->reply_control_blk_length = PCIXCC_MAX_XCRB_RESPONSE_SIZE -
(sizeof(struct type86_fmt2_msg) +
CEIL4(xcRB->reply_data_length));
}
/* prepare type6 header */
msg->hdr = static_type6_hdrX;
@ -678,7 +666,7 @@ static void zcrypt_pcixcc_receive(struct ap_device *ap_dev,
break;
case PCIXCC_RESPONSE_TYPE_XCRB:
length = t86r->fmt2.offset2 + t86r->fmt2.count2;
length = min(PCIXCC_MAX_XCRB_RESPONSE_SIZE, length);
length = min(PCIXCC_MAX_XCRB_MESSAGE_SIZE, length);
memcpy(msg->message, reply->message, length);
break;
default:
@ -1043,7 +1031,7 @@ static int zcrypt_pcixcc_probe(struct ap_device *ap_dev)
struct zcrypt_device *zdev;
int rc = 0;
zdev = zcrypt_device_alloc(PCIXCC_MAX_RESPONSE_SIZE);
zdev = zcrypt_device_alloc(PCIXCC_MAX_XCRB_MESSAGE_SIZE);
if (!zdev)
return -ENOMEM;
zdev->ap_dev = ap_dev;