linux-kernel - [PATCH][next] scsi: qla2xxx: fix null pointer dereference on null

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Message-Id: <20200106141144.52888-1-colin.king@canonical.com>
Date:   Mon,  6 Jan 2020 14:11:44 +0000
From:   Colin King <colin.king@...onical.com>
To:     Himanshu Madhani <hmadhani@...vell.com>,
        "James E . J . Bottomley" <jejb@...ux.ibm.com>,
        "Martin K . Petersen" <martin.petersen@...cle.com>,
        Quinn Tran <qutran@...vell.com>, linux-scsi@...r.kernel.org,
        linux-kernel@...r.kernel.org
Cc:     kernel-janitors@...r.kernel.org
Subject: [PATCH][next] scsi: qla2xxx: fix null pointer dereference on null_fcport

From: Colin Ian King <colin.king@...onical.com>

Currently several error exit return paths end up passing a null
new_fcport pointer to function qla2x00_free_fcport and this causes
a null pointer dereference.  Fix this by moving and renaming the
exit path label to be after the call to qla2x00_free_fcport to avoid
the errorneous and unnecessary call to qla2x00_free_fcport.

Addresses-Coverity: ("Dereference after null check")
Fixes: 3dae220595ba ("scsi: qla2xxx: Use common routine to free fcport struct")
Signed-off-by: Colin Ian King <colin.king@...onical.com>
---
 drivers/scsi/qla2xxx/qla_init.c | 9 ++++-----
 1 file changed, 4 insertions(+), 5 deletions(-)

diff --git a/drivers/scsi/qla2xxx/qla_init.c b/drivers/scsi/qla2xxx/qla_init.c
index a5076f43edea..ed056626d7a3 100644
--- a/drivers/scsi/qla2xxx/qla_init.c
+++ b/drivers/scsi/qla2xxx/qla_init.c
@@ -5108,7 +5108,7 @@ qla2x00_configure_local_loop(scsi_qla_host_t *vha)
 	rval = qla2x00_get_id_list(vha, ha->gid_list, ha->gid_list_dma,
 	    &entries);
 	if (rval != QLA_SUCCESS)
-		goto cleanup_allocation;
+		goto exit;
 
 	ql_dbg(ql_dbg_disc, vha, 0x2011,
 	    "Entries in ID list (%d).\n", entries);
@@ -5138,7 +5138,7 @@ qla2x00_configure_local_loop(scsi_qla_host_t *vha)
 		ql_log(ql_log_warn, vha, 0x2012,
 		    "Memory allocation failed for fcport.\n");
 		rval = QLA_MEMORY_ALLOC_FAILED;
-		goto cleanup_allocation;
+		goto exit;
 	}
 	new_fcport->flags &= ~FCF_FABRIC_DEVICE;
 
@@ -5228,7 +5228,7 @@ qla2x00_configure_local_loop(scsi_qla_host_t *vha)
 				ql_log(ql_log_warn, vha, 0xd031,
 				    "Failed to allocate memory for fcport.\n");
 				rval = QLA_MEMORY_ALLOC_FAILED;
-				goto cleanup_allocation;
+				goto exit;
 			}
 			spin_lock_irqsave(&vha->hw->tgt.sess_lock, flags);
 			new_fcport->flags &= ~FCF_FABRIC_DEVICE;
@@ -5239,7 +5239,6 @@ qla2x00_configure_local_loop(scsi_qla_host_t *vha)
 		/* Base iIDMA settings on HBA port speed. */
 		fcport->fp_speed = ha->link_data_rate;
 
-		found_devs++;
 	}
 
 	list_for_each_entry(fcport, &vha->vp_fcports, list) {
@@ -5271,9 +5270,9 @@ qla2x00_configure_local_loop(scsi_qla_host_t *vha)
 			qla24xx_fcport_handle_login(vha, fcport);
 	}
 
-cleanup_allocation:
 	qla2x00_free_fcport(new_fcport);
 
+exit:
 	if (rval != QLA_SUCCESS) {
 		ql_dbg(ql_dbg_disc, vha, 0x2098,
 		    "Configure local loop error exit: rval=%x.\n", rval);
-- 
2.24.0