diff mbox series

[06/13] scsi: qedi: fix use after free during abort cleanup

Message ID 20210413230648.5593-7-michael.christie@oracle.com (mailing list archive)
State Superseded
Headers show
Series scsi: libicsi and qedi tmf fixes | expand

Commit Message

Mike Christie April 13, 2021, 11:06 p.m. UTC 
This fixes two bugs:

1. The scsi cmd task could be completed and the abort could timeout
while we are running qedi_tmf_work so we need to get a ref to the task.

2. If qedi_tmf_work's qedi_wait_for_cleanup_request call times out then
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
for the abort tmf. We can then race where qedi_process_cmd_cleanup_resp is
still accessing the mtask's qedi_cmd but libiscsi has escalated to session
level cleanup and is cleaning up the mtask while we are still accessing it.

Signed-off-by: Mike Christie <michael.christie@oracle.com>
Reviewed-by: Manish Rangankar <mrangankar@marvell.com>
---
 drivers/scsi/qedi/qedi_fw.c    | 110 ++++++++++++++++++---------------
 drivers/scsi/qedi/qedi_iscsi.h |   1 +
 2 files changed, 61 insertions(+), 50 deletions(-)
diff mbox series

Patch

diff --git a/drivers/scsi/qedi/qedi_fw.c b/drivers/scsi/qedi/qedi_fw.c
index ad4357e4c15d..c5699421ec37 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;
@@ -742,7 +741,7 @@  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;
@@ -768,6 +767,7 @@  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;
 			rtid = work->rtid;
 
@@ -776,52 +776,47 @@  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);
@@ -844,6 +839,7 @@  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);
@@ -946,8 +942,7 @@  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");
@@ -1374,12 +1369,22 @@  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) {
+	spin_lock_bh(&conn->session->back_lock);
+	ctask = iscsi_itt_to_ctask(conn, tmf_hdr->rtt);
+	if (!ctask || iscsi_task_is_completed(ctask)) {
+		spin_unlock_bh(&conn->session->back_lock);
 		QEDI_ERR(&qedi->dbg_ctx, "Task already completed\n");
-		goto abort_ret;
+		goto clear_cleanup;
 	}
 
+	/*
+	 * libiscsi gets a ref before sending the abort, but if libiscsi times
+	 * it out then it could release it and the cmd could complete from
+	 * under us.
+	 */
+	__iscsi_get_task(ctask);
+	spin_unlock_bh(&conn->session->back_lock);
+
 	cmd = (struct qedi_cmd *)ctask->dd_data;
 	QEDI_INFO(&qedi->dbg_ctx, QEDI_LOG_INFO,
 		  "Abort tmf rtt=0x%x, cmd itt=0x%x, cmd tid=0x%x, cid=0x%x\n",
@@ -1389,19 +1394,20 @@  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 put_task;
 	}
 
 	list_work = kzalloc(sizeof(*list_work), GFP_ATOMIC);
 	if (!list_work) {
 		QEDI_ERR(&qedi->dbg_ctx, "Memory allocation failed\n");
-		goto abort_ret;
+		goto put_task;
 	}
 
 	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,
@@ -1434,7 +1440,9 @@  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:
+put_task:
+	iscsi_put_task(ctask);
+clear_cleanup:
 	clear_bit(QEDI_CONN_FW_CLEANUP, &qedi_conn->flags);
 	return;
 
@@ -1455,6 +1463,8 @@  static void qedi_tmf_work(struct work_struct *work)
 	}
 	spin_unlock(&qedi_conn->list_lock);
 
+	iscsi_put_task(ctask);
+
 	clear_bit(QEDI_CONN_FW_CLEANUP, &qedi_conn->flags);
 }
 
diff --git a/drivers/scsi/qedi/qedi_iscsi.h b/drivers/scsi/qedi/qedi_iscsi.h
index 39dc27c85e3c..68ef519f5480 100644
--- a/drivers/scsi/qedi/qedi_iscsi.h
+++ b/drivers/scsi/qedi/qedi_iscsi.h
@@ -212,6 +212,7 @@  struct qedi_cmd {
 struct qedi_work_map {
 	struct list_head list;
 	struct qedi_cmd *qedi_cmd;
+	struct iscsi_task *ctask;
 	int rtid;
 
 	int state;