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

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Message-ID: <20211224120216.35896-1-yuehaibing@huawei.com>
Date:   Fri, 24 Dec 2021 20:02:16 +0800
From:   YueHaibing <yuehaibing@...wei.com>
To:     <kys@...rosoft.com>, <haiyangz@...rosoft.com>,
        <sthemmin@...rosoft.com>, <wei.liu@...nel.org>,
        <decui@...rosoft.com>, <jejb@...ux.ibm.com>,
        <martin.petersen@...cle.com>, <mikelley@...rosoft.com>,
        <Tianyu.Lan@...rosoft.com>, <longli@...rosoft.com>
CC:     <linux-hyperv@...r.kernel.org>, <linux-scsi@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, YueHaibing <yuehaibing@...wei.com>
Subject: [PATCH -next] scsi: storvsc: Fix unsigned comparison to zero

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>
---
 drivers/scsi/storvsc_drv.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/scsi/storvsc_drv.c b/drivers/scsi/storvsc_drv.c
index ae293600d799..072c752a8c36 100644
--- a/drivers/scsi/storvsc_drv.c
+++ b/drivers/scsi/storvsc_drv.c
@@ -1837,7 +1837,7 @@ static int storvsc_queuecommand(struct Scsi_Host *host, struct scsi_cmnd *scmnd)
 		unsigned int hvpg_count = HVPFN_UP(offset_in_hvpg + length);
 		struct scatterlist *sg;
 		unsigned long hvpfn, hvpfns_to_add;
-		int j, i = 0;
+		int sg_cnt, j, i = 0;
 
 		if (hvpg_count > MAX_PAGE_BUFFER_COUNT) {
 
@@ -1851,11 +1851,11 @@ static int storvsc_queuecommand(struct Scsi_Host *host, struct scsi_cmnd *scmnd)
 		payload->range.len = length;
 		payload->range.offset = offset_in_hvpg;
 
-		sg_count = scsi_dma_map(scmnd);
-		if (sg_count < 0)
+		sg_cnt = scsi_dma_map(scmnd);
+		if (sg_cnt < 0)
 			return SCSI_MLQUEUE_DEVICE_BUSY;
 
-		for_each_sg(sgl, sg, sg_count, j) {
+		for_each_sg(sgl, sg, sg_cnt, j) {
 			/*
 			 * Init values for the current sgl entry. hvpfns_to_add
 			 * is in units of Hyper-V size pages. Handling the
-- 
2.17.1