linux-kernel - Re: [PATCH] scsi:lpfc:Fix memory leak on lpfc_bsg_write_ebuf

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Date:   Mon, 9 Dec 2019 09:48:44 -0800
From:   James Smart <james.smart@...adcom.com>
To:     "wubo (T)" <wubo40@...wei.com>,
        "dick.kennedy@...adcom.com" <dick.kennedy@...adcom.com>,
        "jejb@...ux.vnet.ibm.com" <jejb@...ux.vnet.ibm.com>,
        "martin.petersen@...cle.com" <martin.petersen@...cle.com>,
        "linux-scsi@...r.kernel.org" <linux-scsi@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Cc:     "liuzhiqiang (I)" <liuzhiqiang26@...wei.com>,
        Mingfangsen <mingfangsen@...wei.com>
Subject: Re: [PATCH] scsi:lpfc:Fix memory leak on lpfc_bsg_write_ebuf_set func

On 12/6/2019 7:22 PM, wubo (T) wrote:
> When phba->mbox_ext_buf_ctx.seqNum != phba->mbox_ext_buf_ctx.numBuf,
> dd_data should be freed before return SLI_CONFIG_HANDLED.
>
> When lpfc_sli_issue_mbox func return fails, pmboxq should be also freed in job_error tag.
>
>
> Signed-off-by:Bo wu <wubo40@...wei.com>
> Reviewed-by:Zhiqiang Liu <liuzhiqiang26@...wei.com>
> ---
>   drivers/scsi/lpfc/lpfc_bsg.c | 15 +++++++++------
>   1 file changed, 9 insertions(+), 6 deletions(-)
>
> diff --git a/drivers/scsi/lpfc/lpfc_bsg.c b/drivers/scsi/lpfc/lpfc_bsg.c
> index 39a736b887b1..6c2b03415a2c 100644
> --- a/drivers/scsi/lpfc/lpfc_bsg.c
> +++ b/drivers/scsi/lpfc/lpfc_bsg.c
> @@ -4489,12 +4489,6 @@ lpfc_bsg_write_ebuf_set(struct lpfc_hba *phba, struct bsg_job *job,
>   	phba->mbox_ext_buf_ctx.seqNum++;
>   	nemb_tp = phba->mbox_ext_buf_ctx.nembType;
>   
> -	dd_data = kmalloc(sizeof(struct bsg_job_data), GFP_KERNEL);
> -	if (!dd_data) {
> -		rc = -ENOMEM;
> -		goto job_error;
> -	}
> -
>   	pbuf = (uint8_t *)dmabuf->virt;
>   	size = job->request_payload.payload_len;
>   	sg_copy_to_buffer(job->request_payload.sg_list,
> @@ -4531,6 +4525,13 @@ lpfc_bsg_write_ebuf_set(struct lpfc_hba *phba, struct bsg_job *job,
>   				"2968 SLI_CONFIG ext-buffer wr all %d "
>   				"ebuffers received\n",
>   				phba->mbox_ext_buf_ctx.numBuf);
> +
> +		dd_data = kmalloc(sizeof(struct bsg_job_data), GFP_KERNEL);
> +		if (!dd_data) {
> +			rc = -ENOMEM;
> +			goto job_error;
> +		}
> +
>   		/* mailbox command structure for base driver */
>   		pmboxq = mempool_alloc(phba->mbox_mem_pool, GFP_KERNEL);
>   		if (!pmboxq) {
> @@ -4579,6 +4580,8 @@ lpfc_bsg_write_ebuf_set(struct lpfc_hba *phba, struct bsg_job *job,
>   	return SLI_CONFIG_HANDLED;
>   
>   job_error:
> +	if (pmboxq)
> +		mempool_free(pmboxq, phba->mbox_mem_pool);
>   	lpfc_bsg_dma_page_free(phba, dmabuf);
>   	kfree(dd_data);
>   

Looks good!

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

-- james