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[SCSI] iscsi: data digest calculation fix 

From Wang Zhenyu:

data digest fix (the bug caused data corruption w/Wasabi StorageBuilder target)

Signed-off-by: Mike Christie <michaelc@cs.wisc.edu>
Signed-off-by: Alex Aizman <itn780@yahoo.com>
Signed-off-by: Dmitry Yusupov <dmitry_yus@yahoo.com>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
This commit is contained in:
Mike Christie 2005-11-29 23:12:57 -06:00 committed by James Bottomley
parent 733bb6a70c
commit f6cfba1d21
1 changed files with 40 additions and 25 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

65
drivers/scsi/iscsi_tcp.c
View File

@ -903,11 +903,20 @@ partial_sg_digest_update(struct iscsi_conn *conn, struct scatterlist *sg,
crypto_digest_update(conn->data_rx_tfm, &temp, 1);
}
static void
iscsi_recv_digest_update(struct iscsi_conn *conn, char* buf, int len)
{
struct scatterlist tmp;
sg_init_one(&tmp, buf, len);
crypto_digest_update(conn->data_rx_tfm, &tmp, 1);
}
static int iscsi_scsi_data_in(struct iscsi_conn *conn)
{
struct iscsi_cmd_task *ctask = conn->in.ctask;
struct scsi_cmnd *sc = ctask->sc;
struct scatterlist tmp, *sg;
struct scatterlist *sg;
int i, offset, rc = 0;
BUG_ON((void*)ctask != sc->SCp.ptr);
@ -921,10 +930,8 @@ static int iscsi_scsi_data_in(struct iscsi_conn *conn)
sc->request_bufflen, ctask->data_offset);
if (rc == -EAGAIN)
return rc;
if (conn->datadgst_en) {
sg_init_one(&tmp, sc->request_buffer, i);
crypto_digest_update(conn->data_rx_tfm, &tmp, 1);
}
if (conn->datadgst_en)
iscsi_recv_digest_update(conn, sc->request_buffer, i);
rc = 0;
goto done;
}
@ -1018,6 +1025,9 @@ iscsi_data_recv(struct iscsi_conn *conn)
conn->in.hdr = &conn->hdr;
conn->senselen = (conn->data[0] << 8) | conn->data[1];
rc = iscsi_cmd_rsp(conn, conn->in.ctask);
if (!rc && conn->datadgst_en)
iscsi_recv_digest_update(conn, conn->data,
conn->in.datalen);
}
break;
case ISCSI_OP_TEXT_RSP:
@ -1042,6 +1052,11 @@ iscsi_data_recv(struct iscsi_conn *conn)
rc = iscsi_recv_pdu(iscsi_handle(conn), conn->in.hdr,
conn->data, conn->in.datalen);
if (!rc && conn->datadgst_en &&
conn->in.opcode != ISCSI_OP_LOGIN_RSP)
iscsi_recv_digest_update(conn, conn->data,
conn->in.datalen);
if (mtask && conn->login_mtask != mtask) {
spin_lock(&session->lock);
__kfifo_put(session->mgmtpool.queue, (void*)&mtask,
@ -1050,6 +1065,8 @@ iscsi_data_recv(struct iscsi_conn *conn)
}
}
break;
case ISCSI_OP_ASYNC_EVENT:
case ISCSI_OP_REJECT:
default:
BUG_ON(1);
}
@ -1112,7 +1129,7 @@ more:
rc = iscsi_hdr_recv(conn);
if (!rc && conn->in.datalen) {
if (conn->datadgst_en &&
conn->in.opcode == ISCSI_OP_SCSI_DATA_IN) {
conn->in.opcode != ISCSI_OP_LOGIN_RSP) {
BUG_ON(!conn->data_rx_tfm);
crypto_digest_init(conn->data_rx_tfm);
}
@ -1124,26 +1141,24 @@ more:
}
if (conn->in_progress == IN_PROGRESS_DDIGEST_RECV) {
uint32_t recv_digest;
debug_tcp("extra data_recv offset %d copy %d\n",
conn->in.offset, conn->in.copy);
if (conn->in.opcode == ISCSI_OP_SCSI_DATA_IN) {
uint32_t recv_digest;
skb_copy_bits(conn->in.skb, conn->in.offset,
&recv_digest, 4);
conn->in.offset += 4;
conn->in.copy -= 4;
if (recv_digest != conn->in.datadgst) {
debug_tcp("iscsi_tcp: data digest error!"
"0x%x != 0x%x\n", recv_digest,
conn->in.datadgst);
iscsi_conn_failure(conn, ISCSI_ERR_DATA_DGST);
return 0;
} else {
debug_tcp("iscsi_tcp: data digest match!"
"0x%x == 0x%x\n", recv_digest,
conn->in.datadgst);
conn->in_progress = IN_PROGRESS_WAIT_HEADER;
}
skb_copy_bits(conn->in.skb, conn->in.offset,
&recv_digest, 4);
conn->in.offset += 4;
conn->in.copy -= 4;
if (recv_digest != conn->in.datadgst) {
debug_tcp("iscsi_tcp: data digest error!"
"0x%x != 0x%x\n", recv_digest,
conn->in.datadgst);
iscsi_conn_failure(conn, ISCSI_ERR_DATA_DGST);
return 0;
} else {
debug_tcp("iscsi_tcp: data digest match!"
"0x%x == 0x%x\n", recv_digest,
conn->in.datadgst);
conn->in_progress = IN_PROGRESS_WAIT_HEADER;
}
}
@ -1165,7 +1180,7 @@ more:
conn->in.copy -= conn->in.padding;
conn->in.offset += conn->in.padding;
if (conn->datadgst_en &&
conn->in.opcode == ISCSI_OP_SCSI_DATA_IN) {
conn->in.opcode != ISCSI_OP_LOGIN_RSP) {
if (conn->in.padding) {
debug_tcp("padding -> %d\n", conn->in.padding);
memset(pad, 0, conn->in.padding);