linux-kernel - [PATCH 4.13 058/109] scsi: qedi: off by one in qedi_get_cmd_from

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Date:   Sun, 24 Sep 2017 22:33:19 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Dan Carpenter <dan.carpenter@...cle.com>,
        Manish Rangankar <Manish.Rangankar@...ium.com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>
Subject: [PATCH 4.13 058/109] scsi: qedi: off by one in qedi_get_cmd_from_tid()

4.13-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Dan Carpenter <dan.carpenter@...cle.com>

commit fa2d9d6e894e096678a50ef0f65f7a8c3d8a40b8 upstream.

The > here should be >= or we end up reading one element beyond the end
of the qedi->itt_map[] array.  The qedi->itt_map[] array is allocated in
qedi_alloc_itt().

Fixes: ace7f46ba5fd ("scsi: qedi: Add QLogic FastLinQ offload iSCSI driver framework.")
Signed-off-by: Dan Carpenter <dan.carpenter@...cle.com>
Acked-by: Manish Rangankar <Manish.Rangankar@...ium.com>
Signed-off-by: Martin K. Petersen <martin.petersen@...cle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/scsi/qedi/qedi_main.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/scsi/qedi/qedi_main.c
+++ b/drivers/scsi/qedi/qedi_main.c
@@ -1575,7 +1575,7 @@ struct qedi_cmd *qedi_get_cmd_from_tid(s
 {
 	struct qedi_cmd *cmd = NULL;

-	if (tid > MAX_ISCSI_TASK_ENTRIES)
+	if (tid >= MAX_ISCSI_TASK_ENTRIES)
 		return NULL;

 	cmd = qedi->itt_map[tid].p_cmd;