linux-kernel - Re: [PATCH v2] scsi: lpfc: fix ioremap issues in 'lpfc_sli4_pci_mem

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Message-ID: <CABPRKS9FDRyVwvO-sixFJ0uT64ua1s3r9UDNV_raD9bw+WN6HQ@mail.gmail.com>
Date:   Wed, 5 Apr 2023 09:07:34 -0700
From:   Justin Tee <justintee8345@...il.com>
To:     lishuchang@...t.edu.cn
Cc:     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>,
        hust-os-kernel-patches@...glegroups.com,
        James Smart <jsmart2021@...il.com>, linux-scsi@...r.kernel.org,
        linux-kernel@...r.kernel.org, Justin Tee <justin.tee@...adcom.com>
Subject: Re: [PATCH v2] scsi: lpfc: fix ioremap issues in 'lpfc_sli4_pci_mem_setup'

Looks okay.

Reviewed-by: Justin Tee <justin.tee@...adcom.com>

Thanks,
Justin

On Tue, Apr 4, 2023 at 12:24 AM <lishuchang@...t.edu.cn> wrote:
>
> From: Shuchang Li <lishuchang@...t.edu.cn>
>
> When if_type equals to zero and pci_resource_start(pdev, PCI_64BIT_BAR4)
> returns false, drbl_regs_memmap_p is not remapped.This passes a NULL
> pointer to iounmap(), which can trigger a WARN() on certain arches.
>
> When if_type equals to six and pci_resource_start(pdev, PCI_64BIT_BAR4)
> returns true, drbl_regs_memmap_p may has been remapped and
> ctrl_regs_memmap_p is not remapped. This is a resource leak and passes
> a NULL pointer to iounmap().
>
> To fix these issues, we need to add null checks before iounmap(), and
> change some goto lables.
>
> Fixes: 1351e69fc6db ("scsi: lpfc: Add push-to-adapter support to sli4")
> Signed-off-by: Shuchang Li <lishuchang@...t.edu.cn>
> ---
>  drivers/scsi/lpfc/lpfc_init.c | 10 ++++++----
>  1 file changed, 6 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/scsi/lpfc/lpfc_init.c b/drivers/scsi/lpfc/lpfc_init.c
> index 4f7485958c49..ed75230b0209 100644
> --- a/drivers/scsi/lpfc/lpfc_init.c
> +++ b/drivers/scsi/lpfc/lpfc_init.c
> @@ -12026,7 +12026,7 @@ lpfc_sli4_pci_mem_setup(struct lpfc_hba *phba)
>                                 goto out_iounmap_all;
>                 } else {
>                         error = -ENOMEM;
> -                       goto out_iounmap_all;
> +                       goto out_iounmap_ctrl;
>                 }
>         }
>
> @@ -12044,7 +12044,7 @@ lpfc_sli4_pci_mem_setup(struct lpfc_hba *phba)
>                         dev_err(&pdev->dev,
>                            "ioremap failed for SLI4 HBA dpp registers.\n");
>                         error = -ENOMEM;
> -                       goto out_iounmap_ctrl;
> +                       goto out_iounmap_all;
>                 }
>                 phba->pci_bar4_memmap_p = phba->sli4_hba.dpp_regs_memmap_p;
>         }
> @@ -12069,9 +12069,11 @@ lpfc_sli4_pci_mem_setup(struct lpfc_hba *phba)
>         return 0;
>
>  out_iounmap_all:
> -       iounmap(phba->sli4_hba.drbl_regs_memmap_p);
> +       if (phba->sli4_hba.drbl_regs_memmap_p)
> +               iounmap(phba->sli4_hba.drbl_regs_memmap_p);
>  out_iounmap_ctrl:
> -       iounmap(phba->sli4_hba.ctrl_regs_memmap_p);
> +       if (phba->sli4_hba.ctrl_regs_memmap_p)
> +               iounmap(phba->sli4_hba.ctrl_regs_memmap_p);
>  out_iounmap_conf:
>         iounmap(phba->sli4_hba.conf_regs_memmap_p);
>
> --
> 2.25.1
>