linux-kernel - [PATCH 4.19 41/52] mtd: sharpslpart: Fix unsigned comparison to zero

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Message-Id: <20200213151827.127577441@linuxfoundation.org>
Date:   Thu, 13 Feb 2020 07:21:22 -0800
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, YueHaibing <yuehaibing@...wei.com>,
        Miquel Raynal <miquel.raynal@...tlin.com>
Subject: [PATCH 4.19 41/52] mtd: sharpslpart: Fix unsigned comparison to zero

From: YueHaibing <yuehaibing@...wei.com>

commit f33113b542219448fa02d77ca1c6f4265bd7f130 upstream.

The unsigned variable log_num is being assigned a return value
from the call to sharpsl_nand_get_logical_num that can return
-EINVAL.

Detected using Coccinelle:
./drivers/mtd/parsers/sharpslpart.c:207:6-13: WARNING: Unsigned expression compared with zero: log_num > 0

Fixes: 8a4580e4d298 ("mtd: sharpslpart: Add sharpslpart partition parser")
Signed-off-by: YueHaibing <yuehaibing@...wei.com>
Signed-off-by: Miquel Raynal <miquel.raynal@...tlin.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/mtd/parsers/sharpslpart.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/drivers/mtd/parsers/sharpslpart.c
+++ b/drivers/mtd/parsers/sharpslpart.c
@@ -165,10 +165,10 @@ static int sharpsl_nand_get_logical_num(
 
 static int sharpsl_nand_init_ftl(struct mtd_info *mtd, struct sharpsl_ftl *ftl)
 {
-	unsigned int block_num, log_num, phymax;
+	unsigned int block_num, phymax;
+	int i, ret, log_num;
 	loff_t block_adr;
 	u8 *oob;
-	int i, ret;
 
 	oob = kzalloc(mtd->oobsize, GFP_KERNEL);
 	if (!oob)