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author | Mike Christie <michael.christie@oracle.com> | 2021-05-25 13:18:14 -0500 |
---|---|---|
committer | Martin K. Petersen <martin.petersen@oracle.com> | 2021-06-02 01:28:22 -0400 |
commit | 5b04d050cde44c3c1a9a0342da50d785d075b0f6 (patch) | |
tree | c95c6dec01c4e095915245a18e8408985aca122d /drivers/scsi/qedi/qedi_fw.c | |
parent | 2ce002366a3fcc3f9616d4583194f65dde0ad253 (diff) | |
download | linux-stable-5b04d050cde44c3c1a9a0342da50d785d075b0f6.tar.gz linux-stable-5b04d050cde44c3c1a9a0342da50d785d075b0f6.tar.bz2 linux-stable-5b04d050cde44c3c1a9a0342da50d785d075b0f6.zip |
scsi: qedi: Fix use after free during abort cleanup
If qedi_tmf_work's qedi_wait_for_cleanup_request call times out we will
also force the clean up of the qedi_work_map but
qedi_process_cmd_cleanup_resp could still be accessing the qedi_cmd.
To fix this issue we extend where we hold the tmf_work_lock and back_lock
so the qedi_process_cmd_cleanup_resp access is serialized with the cleanup
done in qedi_tmf_work and any completion handling for the iscsi_task.
Link: https://lore.kernel.org/r/20210525181821.7617-22-michael.christie@oracle.com
Reviewed-by: Manish Rangankar <mrangankar@marvell.com>
Signed-off-by: Mike Christie <michael.christie@oracle.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Diffstat (limited to 'drivers/scsi/qedi/qedi_fw.c')
-rw-r--r-- | drivers/scsi/qedi/qedi_fw.c | 113 |
1 files changed, 62 insertions, 51 deletions
diff --git a/drivers/scsi/qedi/qedi_fw.c b/drivers/scsi/qedi/qedi_fw.c index c12bb2dd5ff9..61c1ebb3004c 100644 --- a/drivers/scsi/qedi/qedi_fw.c +++ b/drivers/scsi/qedi/qedi_fw.c @@ -729,7 +729,6 @@ static void qedi_process_nopin_local_cmpl(struct qedi_ctx *qedi, static void qedi_process_cmd_cleanup_resp(struct qedi_ctx *qedi, struct iscsi_cqe_solicited *cqe, - struct iscsi_task *task, struct iscsi_conn *conn) { struct qedi_work_map *work, *work_tmp; @@ -741,7 +740,7 @@ static void qedi_process_cmd_cleanup_resp(struct qedi_ctx *qedi, u32 iscsi_cid; struct qedi_conn *qedi_conn; struct qedi_cmd *dbg_cmd; - struct iscsi_task *mtask; + struct iscsi_task *mtask, *task; struct iscsi_tm *tmf_hdr = NULL; iscsi_cid = cqe->conn_id; @@ -767,6 +766,7 @@ static void qedi_process_cmd_cleanup_resp(struct qedi_ctx *qedi, } found = 1; mtask = qedi_cmd->task; + task = work->ctask; tmf_hdr = (struct iscsi_tm *)mtask->hdr; list_del_init(&work->list); @@ -774,52 +774,47 @@ static void qedi_process_cmd_cleanup_resp(struct qedi_ctx *qedi, qedi_cmd->list_tmf_work = NULL; } } - spin_unlock_bh(&qedi_conn->tmf_work_lock); - - if (found) { - QEDI_INFO(&qedi->dbg_ctx, QEDI_LOG_SCSI_TM, - "TMF work, cqe->tid=0x%x, tmf flags=0x%x, cid=0x%x\n", - proto_itt, tmf_hdr->flags, qedi_conn->iscsi_conn_id); - - if ((tmf_hdr->flags & ISCSI_FLAG_TM_FUNC_MASK) == - ISCSI_TM_FUNC_ABORT_TASK) { - spin_lock_bh(&conn->session->back_lock); - - protoitt = build_itt(get_itt(tmf_hdr->rtt), - conn->session->age); - task = iscsi_itt_to_task(conn, protoitt); - spin_unlock_bh(&conn->session->back_lock); + if (!found) { + spin_unlock_bh(&qedi_conn->tmf_work_lock); + goto check_cleanup_reqs; + } - if (!task) { - QEDI_NOTICE(&qedi->dbg_ctx, - "IO task completed, tmf rtt=0x%x, cid=0x%x\n", - get_itt(tmf_hdr->rtt), - qedi_conn->iscsi_conn_id); - return; - } + QEDI_INFO(&qedi->dbg_ctx, QEDI_LOG_SCSI_TM, + "TMF work, cqe->tid=0x%x, tmf flags=0x%x, cid=0x%x\n", + proto_itt, tmf_hdr->flags, qedi_conn->iscsi_conn_id); + + spin_lock_bh(&conn->session->back_lock); + if (iscsi_task_is_completed(task)) { + QEDI_NOTICE(&qedi->dbg_ctx, + "IO task completed, tmf rtt=0x%x, cid=0x%x\n", + get_itt(tmf_hdr->rtt), qedi_conn->iscsi_conn_id); + goto unlock; + } - dbg_cmd = task->dd_data; + dbg_cmd = task->dd_data; - QEDI_INFO(&qedi->dbg_ctx, QEDI_LOG_SCSI_TM, - "Abort tmf rtt=0x%x, i/o itt=0x%x, i/o tid=0x%x, cid=0x%x\n", - get_itt(tmf_hdr->rtt), get_itt(task->itt), - dbg_cmd->task_id, qedi_conn->iscsi_conn_id); + QEDI_INFO(&qedi->dbg_ctx, QEDI_LOG_SCSI_TM, + "Abort tmf rtt=0x%x, i/o itt=0x%x, i/o tid=0x%x, cid=0x%x\n", + get_itt(tmf_hdr->rtt), get_itt(task->itt), dbg_cmd->task_id, + qedi_conn->iscsi_conn_id); - if (qedi_cmd->state == CLEANUP_WAIT_FAILED) - qedi_cmd->state = CLEANUP_RECV; + spin_lock(&qedi_conn->list_lock); + if (likely(dbg_cmd->io_cmd_in_list)) { + dbg_cmd->io_cmd_in_list = false; + list_del_init(&dbg_cmd->io_cmd); + qedi_conn->active_cmd_count--; + } + spin_unlock(&qedi_conn->list_lock); + qedi_cmd->state = CLEANUP_RECV; +unlock: + spin_unlock_bh(&conn->session->back_lock); + spin_unlock_bh(&qedi_conn->tmf_work_lock); + wake_up_interruptible(&qedi_conn->wait_queue); + return; - spin_lock(&qedi_conn->list_lock); - if (likely(dbg_cmd->io_cmd_in_list)) { - dbg_cmd->io_cmd_in_list = false; - list_del_init(&dbg_cmd->io_cmd); - qedi_conn->active_cmd_count--; - } - spin_unlock(&qedi_conn->list_lock); - qedi_cmd->state = CLEANUP_RECV; - wake_up_interruptible(&qedi_conn->wait_queue); - } - } else if (qedi_conn->cmd_cleanup_req > 0) { +check_cleanup_reqs: + if (qedi_conn->cmd_cleanup_req > 0) { spin_lock_bh(&conn->session->back_lock); qedi_get_proto_itt(qedi, cqe->itid, &ptmp_itt); protoitt = build_itt(ptmp_itt, conn->session->age); @@ -842,6 +837,7 @@ static void qedi_process_cmd_cleanup_resp(struct qedi_ctx *qedi, QEDI_INFO(&qedi->dbg_ctx, QEDI_LOG_TID, "Freeing tid=0x%x for cid=0x%x\n", cqe->itid, qedi_conn->iscsi_conn_id); + qedi_clear_task_idx(qedi_conn->qedi, cqe->itid); } else { qedi_get_proto_itt(qedi, cqe->itid, &ptmp_itt); @@ -944,8 +940,7 @@ void qedi_fp_process_cqes(struct qedi_work *work) goto exit_fp_process; case ISCSI_CQE_TYPE_TASK_CLEANUP: QEDI_INFO(&qedi->dbg_ctx, QEDI_LOG_SCSI_TM, "CleanUp CqE\n"); - qedi_process_cmd_cleanup_resp(qedi, &cqe->cqe_solicited, task, - conn); + qedi_process_cmd_cleanup_resp(qedi, &cqe->cqe_solicited, conn); goto exit_fp_process; default: QEDI_ERR(&qedi->dbg_ctx, "Error cqe.\n"); @@ -1372,11 +1367,25 @@ static void qedi_tmf_work(struct work_struct *work) tmf_hdr = (struct iscsi_tm *)mtask->hdr; set_bit(QEDI_CONN_FW_CLEANUP, &qedi_conn->flags); - ctask = iscsi_itt_to_task(conn, tmf_hdr->rtt); - if (!ctask || !ctask->sc) { - QEDI_ERR(&qedi->dbg_ctx, "Task already completed\n"); - goto abort_ret; + spin_lock_bh(&conn->session->back_lock); + ctask = iscsi_itt_to_ctask(conn, tmf_hdr->rtt); + if (!ctask) { + spin_unlock_bh(&conn->session->back_lock); + QEDI_ERR(&qedi->dbg_ctx, "Invalid RTT. Letting abort timeout.\n"); + goto clear_cleanup; + } + + if (iscsi_task_is_completed(ctask)) { + spin_unlock_bh(&conn->session->back_lock); + QEDI_INFO(&qedi->dbg_ctx, QEDI_LOG_INFO, + "Task already completed\n"); + /* + * We have to still send the TMF because libiscsi needs the + * response to avoid a timeout. + */ + goto send_tmf; } + spin_unlock_bh(&conn->session->back_lock); cmd = (struct qedi_cmd *)ctask->dd_data; QEDI_INFO(&qedi->dbg_ctx, QEDI_LOG_INFO, @@ -1387,19 +1396,20 @@ static void qedi_tmf_work(struct work_struct *work) if (qedi_do_not_recover) { QEDI_ERR(&qedi->dbg_ctx, "DONT SEND CLEANUP/ABORT %d\n", qedi_do_not_recover); - goto abort_ret; + goto clear_cleanup; } list_work = kzalloc(sizeof(*list_work), GFP_ATOMIC); if (!list_work) { QEDI_ERR(&qedi->dbg_ctx, "Memory allocation failed\n"); - goto abort_ret; + goto clear_cleanup; } qedi_cmd->type = TYPEIO; list_work->qedi_cmd = qedi_cmd; list_work->rtid = cmd->task_id; list_work->state = QEDI_WORK_SCHEDULED; + list_work->ctask = ctask; qedi_cmd->list_tmf_work = list_work; QEDI_INFO(&qedi->dbg_ctx, QEDI_LOG_SCSI_TM, @@ -1422,6 +1432,7 @@ static void qedi_tmf_work(struct work_struct *work) goto ldel_exit; } +send_tmf: tid = qedi_get_task_idx(qedi); if (tid == -1) { QEDI_ERR(&qedi->dbg_ctx, "Invalid tid, cid=0x%x\n", @@ -1432,7 +1443,7 @@ static void qedi_tmf_work(struct work_struct *work) qedi_cmd->task_id = tid; qedi_send_iscsi_tmf(qedi_conn, qedi_cmd->task); -abort_ret: +clear_cleanup: clear_bit(QEDI_CONN_FW_CLEANUP, &qedi_conn->flags); return; |