Re: [PATCH RESEND] qla2xxx: Fix gnl.l memory leak on adapter init failure

[Himanshu Madhani <hmadhani@xxxxxxxxxxx>]

On 8/14/19, 9:25 AM, "linux-scsi-owner@xxxxxxxxxxxxxxx on behalf of Bill Kuzeja" <linux-scsi-owner@xxxxxxxxxxxxxxx on behalf of William.Kuzeja@xxxxxxxxxxx> wrote:

    If HBA initialization fails unexpectedly (exiting via probe_failed:), we 
    may fail to free vha->gnl.l. So that we don't attempt to double free,
    set this pointer to NULL after a free and check for NULL at probe_failed:
    so we know whether or not to call dma_free_coherent. 
    
    Signed-off-by: Bill Kuzeja <william.kuzeja@xxxxxxxxxxx>
    ---
     drivers/scsi/qla2xxx/qla_attr.c |  2 ++
     drivers/scsi/qla2xxx/qla_os.c   | 11 ++++++++++-
     2 files changed, 12 insertions(+), 1 deletion(-)
    
    diff --git a/drivers/scsi/qla2xxx/qla_attr.c b/drivers/scsi/qla2xxx/qla_attr.c
    index 8d560c5..6b7b390 100644
    --- a/drivers/scsi/qla2xxx/qla_attr.c
    +++ b/drivers/scsi/qla2xxx/qla_attr.c
    @@ -2956,6 +2956,8 @@ void qla_insert_tgt_attrs(void)
     	dma_free_coherent(&ha->pdev->dev, vha->gnl.size, vha->gnl.l,
     	    vha->gnl.ldma);
     
    +	vha->gnl.l = NULL;
    +
     	vfree(vha->scan.l);
     
     	if (vha->qpair && vha->qpair->vp_idx == vha->vp_idx) {
    diff --git a/drivers/scsi/qla2xxx/qla_os.c b/drivers/scsi/qla2xxx/qla_os.c
    index 2e58cff..98e60a3 100644
    --- a/drivers/scsi/qla2xxx/qla_os.c
    +++ b/drivers/scsi/qla2xxx/qla_os.c
    @@ -3440,6 +3440,12 @@ static void qla2x00_iocb_work_fn(struct work_struct *work)
     	return 0;
     
     probe_failed:
    +	if (base_vha->gnl.l) {
    +		dma_free_coherent(&ha->pdev->dev, base_vha->gnl.size,
    +				base_vha->gnl.l, base_vha->gnl.ldma);
    +		base_vha->gnl.l = NULL;
    +	}
    +
     	if (base_vha->timer_active)
     		qla2x00_stop_timer(base_vha);
     	base_vha->flags.online = 0;
    @@ -3673,7 +3679,7 @@ static void qla2x00_iocb_work_fn(struct work_struct *work)
     	if (!atomic_read(&pdev->enable_cnt)) {
     		dma_free_coherent(&ha->pdev->dev, base_vha->gnl.size,
     		    base_vha->gnl.l, base_vha->gnl.ldma);
    -
    +		base_vha->gnl.l = NULL;
     		scsi_host_put(base_vha->host);
     		kfree(ha);
     		pci_set_drvdata(pdev, NULL);
    @@ -3713,6 +3719,8 @@ static void qla2x00_iocb_work_fn(struct work_struct *work)
     	dma_free_coherent(&ha->pdev->dev,
     		base_vha->gnl.size, base_vha->gnl.l, base_vha->gnl.ldma);
     
    +	base_vha->gnl.l = NULL;
    +
     	vfree(base_vha->scan.l);
     
     	if (IS_QLAFX00(ha))
    @@ -4816,6 +4824,7 @@ struct scsi_qla_host *qla2x00_create_host(struct scsi_host_template *sht,
     		    "Alloc failed for scan database.\n");
     		dma_free_coherent(&ha->pdev->dev, vha->gnl.size,
     		    vha->gnl.l, vha->gnl.ldma);
    +		vha->gnl.l = NULL;
     		scsi_remove_host(vha->host);
     		return NULL;
     	}
    -- 
    1.8.3.1

Thanks for resend Bill
    
Patch Looks Good. 

Acked-by: Himanshu Madhani <hmadhani@xxxxxxxxxxx>