linux-kernel - [PATCH AUTOSEL 4.19 10/11] scsi: libfc: Fix potential NULL pointer dereference in fc_lport_ptp

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Message-ID: <20231107155430.3768779-10-sashal@kernel.org>
Date:   Tue,  7 Nov 2023 10:54:18 -0500
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Wenchao Hao <haowenchao2@...wei.com>,
        Simon Horman <horms@...nel.org>,
        "Martin K . Petersen" <martin.petersen@...cle.com>,
        Sasha Levin <sashal@...nel.org>, hare@...e.de,
        jejb@...ux.ibm.com, richardcochran@...il.com,
        linux-scsi@...r.kernel.org, netdev@...r.kernel.org
Subject: [PATCH AUTOSEL 4.19 10/11] scsi: libfc: Fix potential NULL pointer dereference in fc_lport_ptp_setup()

From: Wenchao Hao <haowenchao2@...wei.com>

[ Upstream commit 4df105f0ce9f6f30cda4e99f577150d23f0c9c5f ]

fc_lport_ptp_setup() did not check the return value of fc_rport_create()
which can return NULL and would cause a NULL pointer dereference. Address
this issue by checking return value of fc_rport_create() and log error
message on fc_rport_create() failed.

Signed-off-by: Wenchao Hao <haowenchao2@...wei.com>
Link: https://lore.kernel.org/r/20231011130350.819571-1-haowenchao2@huawei.com
Reviewed-by: Simon Horman <horms@...nel.org>
Signed-off-by: Martin K. Petersen <martin.petersen@...cle.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/scsi/libfc/fc_lport.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/scsi/libfc/fc_lport.c b/drivers/scsi/libfc/fc_lport.c
index f653109d56af0..f84c8a9846abb 100644
--- a/drivers/scsi/libfc/fc_lport.c
+++ b/drivers/scsi/libfc/fc_lport.c
@@ -250,6 +250,12 @@ static void fc_lport_ptp_setup(struct fc_lport *lport,
 	}
 	mutex_lock(&lport->disc.disc_mutex);
 	lport->ptp_rdata = fc_rport_create(lport, remote_fid);
+	if (!lport->ptp_rdata) {
+		printk(KERN_WARNING "libfc: Failed to setup lport 0x%x\n",
+			lport->port_id);
+		mutex_unlock(&lport->disc.disc_mutex);
+		return;
+	}
 	kref_get(&lport->ptp_rdata->kref);
 	lport->ptp_rdata->ids.port_name = remote_wwpn;
 	lport->ptp_rdata->ids.node_name = remote_wwnn;
-- 
2.42.0