linux-kernel - [PATCH] scsi: lpfc: Avoid another null dereference in lpfc_sli4_hba

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Date:   Tue, 23 Jun 2020 10:41:22 +0200
From:   SeongJae Park <sjpark@...zon.com>
To:     <james.smart@...adcom.com>, <jsmart2021@...il.com>,
        <dick.kennedy@...adcom.com>
CC:     <jejb@...ux.ibm.com>, <martin.petersen@...cle.com>,
        <linux-scsi@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        SeongJae Park <sjpark@...zon.de>
Subject: [PATCH] scsi: lpfc: Avoid another null dereference in lpfc_sli4_hba_unset()

From: SeongJae Park <sjpark@...zon.de>

Commit cdb42becdd40 ("scsi: lpfc: Replace io_channels for nvme and fcp
with general hdw_queues per cpu") has introduced static checker warnings
for potential null dereferences in 'lpfc_sli4_hba_unset()' and
commit 1ffdd2c0440d ("scsi: lpfc: resolve static checker warning in
lpfc_sli4_hba_unset") has tried to fix it.  However, yet another
potential null dereference is remaining.  This commit fixes it.

This bug was discovered and resolved using Coverity Static Analysis
Security Testing (SAST) by Synopsys, Inc.

Fixes: 1ffdd2c0440d ("scsi: lpfc: resolve static checker warning inlpfc_sli4_hba_unset")
Fixes: cdb42becdd40 ("scsi: lpfc: Replace io_channels for nvme and fcp with general hdw_queues per cpu")
Signed-off-by: SeongJae Park <sjpark@...zon.de>
---
 drivers/scsi/lpfc/lpfc_init.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/scsi/lpfc/lpfc_init.c b/drivers/scsi/lpfc/lpfc_init.c
index 69a5249e007a..6637f84a3d1b 100644
--- a/drivers/scsi/lpfc/lpfc_init.c
+++ b/drivers/scsi/lpfc/lpfc_init.c
@@ -11878,7 +11878,8 @@ lpfc_sli4_hba_unset(struct lpfc_hba *phba)
 	lpfc_sli4_xri_exchange_busy_wait(phba);
 
 	/* per-phba callback de-registration for hotplug event */
-	lpfc_cpuhp_remove(phba);
+	if (phba->pport)
+		lpfc_cpuhp_remove(phba);
 
 	/* Disable PCI subsystem interrupt */
 	lpfc_sli4_disable_intr(phba);
-- 
2.17.1