linux-kernel - [PATCH] scsi: lpfc: Fix memory leak in lpfc_create

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Message-Id: <20220916035908.712799-1-rafaelmendsr@gmail.com>
Date:   Fri, 16 Sep 2022 00:59:07 -0300
From:   Rafael Mendonca <rafaelmendsr@...il.com>
To:     James Smart <james.smart@...adcom.com>,
        Dick Kennedy <dick.kennedy@...adcom.com>,
        "James E.J. Bottomley" <jejb@...ux.ibm.com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>,
        Gaurav Srivastava <gaurav.srivastava@...adcom.com>,
        Hannes Reinecke <hare@...e.de>,
        Muneendra Kumar <muneendra.kumar@...adcom.com>
Cc:     Rafael Mendonca <rafaelmendsr@...il.com>,
        James Smart <jsmart2021@...il.com>, linux-scsi@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH] scsi: lpfc: Fix memory leak in lpfc_create_port()

Commit 5e633302ace1 ("scsi: lpfc: vmid: Add support for VMID in mailbox
command") introduced allocations for the VMID resources in
lpfc_create_port() after the call to scsi_host_alloc(). Upon failure on the
VMID allocations, the new code would branch to the 'out' label, which
returns NULL without unwinding anything, thus skipping the call to
scsi_host_put().

Fix the problem by creating a separate label 'out_free_vmid' to unwind the
VMID resources and make the 'out_put_shost' label call only
scsi_host_put(), as was done before the introduction of allocations for
VMID.

Fixes: 5e633302ace1 ("scsi: lpfc: vmid: Add support for VMID in mailbox command")
Signed-off-by: Rafael Mendonca <rafaelmendsr@...il.com>
---
 drivers/scsi/lpfc/lpfc_init.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/drivers/scsi/lpfc/lpfc_init.c b/drivers/scsi/lpfc/lpfc_init.c
index 55a1ad6eed03..6f572f0c5c45 100644
--- a/drivers/scsi/lpfc/lpfc_init.c
+++ b/drivers/scsi/lpfc/lpfc_init.c
@@ -4819,7 +4819,7 @@ lpfc_create_port(struct lpfc_hba *phba, int instance, struct device *dev)
 	rc = lpfc_vmid_res_alloc(phba, vport);
 
 	if (rc)
-		goto out;
+		goto out_put_shost;
 
 	/* Initialize all internally managed lists. */
 	INIT_LIST_HEAD(&vport->fc_nodes);
@@ -4837,16 +4837,17 @@ lpfc_create_port(struct lpfc_hba *phba, int instance, struct device *dev)
 
 	error = scsi_add_host_with_dma(shost, dev, &phba->pcidev->dev);
 	if (error)
-		goto out_put_shost;
+		goto out_free_vmid;
 
 	spin_lock_irq(&phba->port_list_lock);
 	list_add_tail(&vport->listentry, &phba->port_list);
 	spin_unlock_irq(&phba->port_list_lock);
 	return vport;
 
-out_put_shost:
+out_free_vmid:
 	kfree(vport->vmid);
 	bitmap_free(vport->vmid_priority_range);
+out_put_shost:
 	scsi_host_put(shost);
 out:
 	return NULL;
-- 
2.34.1