linux-kernel - Re: [PATCH] lpfc: avoid double free of resource identifiers

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Message-ID: <43af5f62-2e79-62c6-c045-5da0cff18e10@broadcom.com>
Date:   Wed, 11 Jan 2017 11:47:49 -0800
From:   James Smart <james.smart@...adcom.com>
To:     Johannes Thumshirn <jthumshirn@...e.de>,
        "Martin K . Petersen" <martin.petersen@...cle.com>
Cc:     Linux SCSI Mailinglist <linux-scsi@...r.kernel.org>,
        Linux Kernel Mailinglist <linux-kernel@...r.kernel.org>,
        Dick Kennedy <dick.kennedy@...adcom.com>,
        Roberto Sassu <rsassu@...e.de>
Subject: Re: [PATCH] lpfc: avoid double free of resource identifiers

looks good. Thanks

Signed-off-by: James Smart <james.smart@...adcom.com>

-- james


On 1/11/2017 2:06 AM, Johannes Thumshirn wrote:
> From: Roberto Sassu <rsassu@...e.de>
>
> Set variables initialized in lpfc_sli4_alloc_resource_identifiers() to NULL
> if an error occurred. Otherwise, lpfc_sli4_driver_resource_unset() attempts
> to free the memory again.
>
> Signed-off-by: Roberto Sassu <rsassu@...e.de>
> Signed-off-by: Johannes Thumshirn <jthumshirn@...e.de>
> ---
>   drivers/scsi/lpfc/lpfc_sli.c | 7 +++++++
>   1 file changed, 7 insertions(+)
>
> diff --git a/drivers/scsi/lpfc/lpfc_sli.c b/drivers/scsi/lpfc/lpfc_sli.c
> index 4faa767..a78a3df 100644
> --- a/drivers/scsi/lpfc/lpfc_sli.c
> +++ b/drivers/scsi/lpfc/lpfc_sli.c
> @@ -5954,18 +5954,25 @@ lpfc_sli4_alloc_resource_identifiers(struct lpfc_hba *phba)
>   
>    free_vfi_bmask:
>   	kfree(phba->sli4_hba.vfi_bmask);
> +	phba->sli4_hba.vfi_bmask = NULL;
>    free_xri_ids:
>   	kfree(phba->sli4_hba.xri_ids);
> +	phba->sli4_hba.xri_ids = NULL;
>    free_xri_bmask:
>   	kfree(phba->sli4_hba.xri_bmask);
> +	phba->sli4_hba.xri_bmask = NULL;
>    free_vpi_ids:
>   	kfree(phba->vpi_ids);
> +	phba->vpi_ids = NULL;
>    free_vpi_bmask:
>   	kfree(phba->vpi_bmask);
> +	phba->vpi_bmask = NULL;
>    free_rpi_ids:
>   	kfree(phba->sli4_hba.rpi_ids);
> +	phba->sli4_hba.rpi_ids = NULL;
>    free_rpi_bmask:
>   	kfree(phba->sli4_hba.rpi_bmask);
> +	phba->sli4_hba.rpi_bmask = NULL;
>    err_exit:
>   	return rc;
>   }