scsi: lpfc: Fix memory leak in lpfc_create_port()

[ Upstream commit dc8e483f684a24cc06e1d5fa958b54db58855093 ]

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@gmail.com>
Link: https://lore.kernel.org/r/20220916035908.712799-1-rafaelmendsr@gmail.com
Reviewed-by: James Smart <jsmart2021@gmail.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/scsi/lpfc/lpfc_init.c b/drivers/scsi/lpfc/lpfc_init.c
index 33e33ff..48043e1 100644 (file)
--- a/drivers/scsi/lpfc/lpfc_init.c
+++ b/drivers/scsi/lpfc/lpfc_init.c
@@ -4666,7 +4666,7 @@ 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);
@@ -4684,16 +4684,17 @@ 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;