linux-kernel - [PATCH] scsi: csiostor: Fix dereference of null pointer rn

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Message-ID: <20260129155332.196338-1-colin.i.king@gmail.com>
Date: Thu, 29 Jan 2026 15:53:32 +0000
From: Colin Ian King <colin.i.king@...il.com>
To: "James E . J . Bottomley" <James.Bottomley@...senPartnership.com>,
	"Martin K . Petersen" <martin.petersen@...cle.com>,
	Bart Van Assche <bvanassche@....org>,
	Naresh Kumar Inna <naresh@...lsio.com>,
	linux-scsi@...r.kernel.org
Cc: kernel-janitors@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH] scsi: csiostor: Fix dereference of null pointer rn

The error exit path when rn is NULL ends up deferencing the null
pointer rn via the use of the macro CSIO_INC_STATS. Fix this by
adding a new error return path label after the use of the macro
to avoid the deference.

Fixes: a3667aaed569 ("[SCSI] csiostor: Chelsio FCoE offload driver")
Signed-off-by: Colin Ian King <colin.i.king@...il.com>
---
 drivers/scsi/csiostor/csio_scsi.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/scsi/csiostor/csio_scsi.c b/drivers/scsi/csiostor/csio_scsi.c
index c29bf2807e31..05137784f369 100644
--- a/drivers/scsi/csiostor/csio_scsi.c
+++ b/drivers/scsi/csiostor/csio_scsi.c
@@ -2074,7 +2074,7 @@ csio_eh_lun_reset_handler(struct scsi_cmnd *cmnd)
 	struct csio_scsi_level_data sld;
 
 	if (!rn)
-		goto fail;
+		goto fail_ret;
 
 	csio_dbg(hw, "Request to reset LUN:%llu (ssni:0x%x tgtid:%d)\n",
 		      cmnd->device->lun, rn->flowid, rn->scsi_id);
@@ -2220,6 +2220,7 @@ csio_eh_lun_reset_handler(struct scsi_cmnd *cmnd)
 	csio_put_scsi_ioreq_lock(hw, scsim, ioreq);
 fail:
 	CSIO_INC_STATS(rn, n_lun_rst_fail);
+fail_ret:
 	return FAILED;
 }
 
-- 
2.47.3