From f6cfba1d21e9e4afd80e2274aa4df3dc1bd0aab7 Mon Sep 17 00:00:00 2001 From: Mike Christie Date: Tue, 29 Nov 2005 23:12:57 -0600 Subject: [PATCH] [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 Signed-off-by: Alex Aizman Signed-off-by: Dmitry Yusupov Signed-off-by: James Bottomley --- drivers/scsi/iscsi_tcp.c | 65 ++++++++++++++++++++++++---------------- 1 file changed, 40 insertions(+), 25 deletions(-) diff --git a/drivers/scsi/iscsi_tcp.c b/drivers/scsi/iscsi_tcp.c index e6991515ad2e..83e2f8c8e496 100644 --- a/drivers/scsi/iscsi_tcp.c +++ b/drivers/scsi/iscsi_tcp.c @@ -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); -- 2.20.1