linux-kernel - [PATCH v2] scsi: qedf: Fix NULL dereference in error handling

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Date:   Tue,  2 May 2023 22:00:21 +0800
From:   Jinhong Zhu <jinhongzhu@...t.edu.cn>
To:     Saurav Kashyap <skashyap@...vell.com>,
        Javed Hasan <jhasan@...vell.com>,
        GR-QLogic-Storage-Upstream@...vell.com,
        "James E.J. Bottomley" <jejb@...ux.ibm.com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>,
        Manish Rangankar <manish.rangankar@...ium.com>,
        Arun Easi <arun.easi@...ium.com>,
        Nilesh Javali <nilesh.javali@...ium.com>
Cc:     Jinhong Zhu <jinhongzhu@...t.edu.cn>,
        Dan Carpenter <error27@...il.com>,
        Saurav Kashyap <saurav.kashyap@...ium.com>,
        linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH v2] scsi: qedf: Fix NULL dereference in error handling

Smatch reported:

drivers/scsi/qedf/qedf_main.c:3056 qedf_alloc_global_queues()
warn: missing unwind goto?

At this point in the function, nothing has been allocated so we can
return directly. In particular the "qedf->global_queues" have not been
allocated so calling qedf_free_global_queues() will lead to a NULL
dereference when we check if (!gl[i]) and "gl" is NULL.

Fixes: 61d8658b4a43 ("scsi: qedf: Add QLogic FastLinQ offload FCoE driver framework.")
Signed-off-by: Jinhong Zhu <jinhongzhu@...t.edu.cn>
Reviewed-by: Dan Carpenter <error27@...il.com>
---
V2: Fix the wrong "Fixes" tag in V1.
---
 drivers/scsi/qedf/qedf_main.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/drivers/scsi/qedf/qedf_main.c b/drivers/scsi/qedf/qedf_main.c
index 35e16600fc63..f2c7dd4db9c6 100644
--- a/drivers/scsi/qedf/qedf_main.c
+++ b/drivers/scsi/qedf/qedf_main.c
@@ -3043,9 +3043,8 @@ static int qedf_alloc_global_queues(struct qedf_ctx *qedf)
 	 * addresses of our queues
 	 */
 	if (!qedf->p_cpuq) {
-		status = -EINVAL;
 		QEDF_ERR(&qedf->dbg_ctx, "p_cpuq is NULL.\n");
-		goto mem_alloc_failure;
+		return -EINVAL;
 	}
 
 	qedf->global_queues = kzalloc((sizeof(struct global_queue *)
-- 
2.34.1