linux-kernel - RE: [PATCH v2 -next] scsi: storvsc: Fix unsigned comparison to zero

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Date:   Tue, 28 Dec 2021 18:04:11 +0000
From:   "Michael Kelley (LINUX)" <mikelley@...rosoft.com>
To:     YueHaibing <yuehaibing@...wei.com>,
        KY Srinivasan <kys@...rosoft.com>,
        Haiyang Zhang <haiyangz@...rosoft.com>,
        Stephen Hemminger <sthemmin@...rosoft.com>,
        "wei.liu@...nel.org" <wei.liu@...nel.org>,
        Dexuan Cui <decui@...rosoft.com>,
        "jejb@...ux.ibm.com" <jejb@...ux.ibm.com>,
        "martin.petersen@...cle.com" <martin.petersen@...cle.com>,
        Tianyu Lan <Tianyu.Lan@...rosoft.com>,
        Long Li <longli@...rosoft.com>
CC:     "linux-hyperv@...r.kernel.org" <linux-hyperv@...r.kernel.org>,
        "linux-scsi@...r.kernel.org" <linux-scsi@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH v2 -next] scsi: storvsc: Fix unsigned comparison to zero

From: YueHaibing <yuehaibing@...wei.com> Sent: Sunday, December 26, 2021 8:03 PM
> 
> The unsigned variable sg_count is being assigned a return value
> from the call to scsi_dma_map() that can return -ENOMEM.
> 
> Fixes: 743b237c3a7b ("scsi: storvsc: Add Isolation VM support for storvsc driver")
> Signed-off-by: YueHaibing <yuehaibing@...wei.com>
> ---
> v2: define sg_count as int type
> ---
>  drivers/scsi/storvsc_drv.c | 6 ++----
>  1 file changed, 2 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/scsi/storvsc_drv.c b/drivers/scsi/storvsc_drv.c
> index ae293600d799..2273b843d9d2 100644
> --- a/drivers/scsi/storvsc_drv.c
> +++ b/drivers/scsi/storvsc_drv.c
> @@ -1753,7 +1753,6 @@ static int storvsc_queuecommand(struct Scsi_Host *host, struct scsi_cmnd *scmnd)
>  	struct hv_device *dev = host_dev->dev;
>  	struct storvsc_cmd_request *cmd_request = scsi_cmd_priv(scmnd);
>  	struct scatterlist *sgl;
> -	unsigned int sg_count;
>  	struct vmscsi_request *vm_srb;
>  	struct vmbus_packet_mpb_array  *payload;
>  	u32 payload_sz;
> @@ -1826,18 +1825,17 @@ static int storvsc_queuecommand(struct Scsi_Host *host, struct scsi_cmnd *scmnd)
>  	memcpy(vm_srb->cdb, scmnd->cmnd, vm_srb->cdb_length);
> 
>  	sgl = (struct scatterlist *)scsi_sglist(scmnd);
> -	sg_count = scsi_sg_count(scmnd);
> 
>  	length = scsi_bufflen(scmnd);
>  	payload = (struct vmbus_packet_mpb_array *)&cmd_request->mpb;
>  	payload_sz = sizeof(cmd_request->mpb);
> 
> -	if (sg_count) {
> +	if (scsi_sg_count(scmnd)) {
>  		unsigned long offset_in_hvpg = offset_in_hvpage(sgl->offset);
>  		unsigned int hvpg_count = HVPFN_UP(offset_in_hvpg + length);
>  		struct scatterlist *sg;
>  		unsigned long hvpfn, hvpfns_to_add;
> -		int j, i = 0;
> +		int j, i = 0, sg_count;
> 
>  		if (hvpg_count > MAX_PAGE_BUFFER_COUNT) {
> 
> --
> 2.17.1

Reviewed-by: Michael Kelley <mikelley@...rosoft.com>