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From: Mike Christie <michael.christie@oracle.com>
To: mlombard@redhat.com, martin.petersen@oracle.com,
	mgurtovoy@nvidia.com, sagi@grimberg.me, d.bogdanov@yadro.com,
	linux-scsi@vger.kernel.org, target-devel@vger.kernel.org
Cc: Mike Christie <michael.christie@oracle.com>
Subject: [PATCH 11/18] IB/isert: Fix use after free during conn cleanup
Date: Thu,  9 Mar 2023 16:33:05 -0600	[thread overview]
Message-ID: <20230309223312.94595-12-michael.christie@oracle.com> (raw)
In-Reply-To: <20230309223312.94595-1-michael.christie@oracle.com>

We can end up freeing a command too early during conn cleanup by doing:

1. Send iserts N 1MB writes.
2. Pull cable or down the port isert is using.
3. isert_wait_conn's call to isert_put_unsol_pending_cmds races
with a running isert_send_done -> isert_completion_put -> isert_put_cmd
where isert_put_unsol_pending_cmds sees the cmd on the conn_cmd_list
and it does a isert_put_cmd which will free the cmd. Then isert_send_done
is run and will access the freed command while doing it's normal command
completion:
isert_completion_put -> isert_put_cmd -> transport_generic_free_cmd

This patch has us increment write_data_done, so
isert_put_unsol_pending_cmds can correctly detect commands which will we
will not be calling isert_send_done for.

Fixes: 38a2d0d429f1 ("IB/isert: convert to the generic RDMA READ/WRITE API")
[code written and suggested by]
Suggested-by: Sagi Grimberg <sagi@grimberg.me>

Signed-off-by: Mike Christie <michael.christie@oracle.com>
Reviewed-by: Maurizio Lombardi <mlombard@redhat.com>

---
 drivers/infiniband/ulp/isert/ib_isert.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/infiniband/ulp/isert/ib_isert.c b/drivers/infiniband/ulp/isert/ib_isert.c
index 516fa37494e1..a44da60352f6 100644
--- a/drivers/infiniband/ulp/isert/ib_isert.c
+++ b/drivers/infiniband/ulp/isert/ib_isert.c
@@ -1636,7 +1636,7 @@ isert_rdma_read_done(struct ib_cq *cq, struct ib_wc *wc)
 	if (isert_prot_cmd(isert_conn, se_cmd))
 		ret = isert_check_pi_status(se_cmd, isert_cmd->rw.reg->mr);
 	isert_rdma_rw_ctx_destroy(isert_cmd, isert_conn);
-	cmd->write_data_done = 0;
+	cmd->write_data_done = se_cmd->data_length; /* done fetching data */
 
 	isert_dbg("Cmd: %p RDMA_READ comp calling execute_cmd\n", isert_cmd);
 	spin_lock_bh(&cmd->istate_lock);
-- 
2.31.1


  parent reply	other threads:[~2023-03-09 22:34 UTC|newest]

Thread overview: 30+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2023-03-09 22:32 [PATCH 00/18] target: TMF and recovery fixes Mike Christie
2023-03-09 22:32 ` [PATCH 01/18] scsi: target: Move sess cmd counter to new struct Mike Christie
2023-03-09 22:32 ` [PATCH 02/18] scsi: target: Move cmd counter allocation Mike Christie
2023-03-09 22:32 ` [PATCH 03/18] scsi: target: Pass in cmd counter to use during cmd setup Mike Christie
2023-03-09 22:32 ` [PATCH 04/18] scsi: target: iscsit/isert: Alloc per conn cmd counter Mike Christie
2023-03-09 22:32 ` [PATCH 05/18] scsi: target: iscsit: stop/wait on cmds during conn close Mike Christie
2023-03-09 22:33 ` [PATCH 06/18] scsi: target: Drop t_state_lock use in compare_and_write_post Mike Christie
2023-03-09 22:33 ` [PATCH 07/18] scsi: target: Treat CMD_T_FABRIC_STOP like CMD_T_STOP Mike Christie
2023-03-15 10:47   ` Dmitry Bogdanov
2023-03-15 22:54     ` Mike Christie
2023-03-16  0:01       ` michael.christie
2023-03-09 22:33 ` [PATCH 08/18] scsi: target: iscsit: Add helper to check when cmd has failed Mike Christie
2023-03-09 22:33 ` [PATCH 09/18] scsi: target: iscsit: Cleanup isert commands at conn closure Mike Christie
2023-03-09 22:33 ` [PATCH 10/18] IB/isert: Fix hang in target_wait_for_cmds Mike Christie
2023-03-09 22:33 ` Mike Christie [this message]
2023-03-15 15:21   ` [PATCH 11/18] IB/isert: Fix use after free during conn cleanup Sagi Grimberg
2023-03-09 22:33 ` [PATCH 12/18] scsi: target: iscsit: free cmds before session free Mike Christie
2023-03-09 22:33 ` [PATCH 13/18] scsi: target: Fix multiple LUN_RESET handling Mike Christie
2023-03-15 16:13   ` Dmitry Bogdanov
2023-03-15 16:44     ` Mike Christie
2023-03-15 19:11       ` Dmitry Bogdanov
2023-03-15 21:42         ` Mike Christie
2023-03-16 10:39           ` Dmitry Bogdanov
2023-03-16 16:03             ` Mike Christie
2023-03-16 16:07             ` Mike Christie
2023-03-09 22:33 ` [PATCH 14/18] scsi: target: Don't set CMD_T_FABRIC_STOP for aborted tasks Mike Christie
2023-03-09 22:33 ` [PATCH 15/18] scsi: target: iscsit: Fix TAS handling during conn cleanup Mike Christie
2023-03-09 22:33 ` [PATCH 16/18] scsi: target: drop tas arg from __transport_wait_for_tasks Mike Christie
2023-03-09 22:33 ` [PATCH 17/18] scsi: target: Remove sess_cmd_lock Mike Christie
2023-03-09 22:33 ` [PATCH 18/18] scsi: target: Move tag pr_debug to before we do a put on the cmd Mike Christie

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