linux-kernel - [PATCH v3 -next] mtd: docg3: Fix a possible memory leak of mtd->name

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Date:   Wed, 23 Jan 2019 17:28:19 +0800
From:   YueHaibing <yuehaibing@...wei.com>
To:     <robert.jarzmik@...e.fr>, <dwmw2@...radead.org>,
        <computersforpeace@...il.com>, <bbrezillon@...nel.org>,
        <marek.vasut@...il.com>, <richard@....at>
CC:     <linux-kernel@...r.kernel.org>, <linux-mtd@...ts.infradead.org>,
        YueHaibing <yuehaibing@...wei.com>
Subject: [PATCH v3 -next] mtd: docg3: Fix a possible memory leak of mtd->name

In case DOC_CHIPID_G3, mtd->name is not freed in err handling path,
which is alloced by kasprintf(). Fix this by using devm_kasprintf().

Fixes: ae9d4934b2d7 ("mtd: docg3: add multiple floor support")
Signed-off-by: YueHaibing <yuehaibing@...wei.com>
---
v3: use devm_kasprintf
---
 drivers/mtd/devices/docg3.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/mtd/devices/docg3.c b/drivers/mtd/devices/docg3.c
index 4c94fc0..59ca4f5 100644
--- a/drivers/mtd/devices/docg3.c
+++ b/drivers/mtd/devices/docg3.c
@@ -1767,8 +1767,8 @@ static int __init doc_set_driver_info(int chip_id, struct mtd_info *mtd)
 
 	switch (chip_id) {
 	case DOC_CHIPID_G3:
-		mtd->name = kasprintf(GFP_KERNEL, "docg3.%d",
-				      docg3->device_id);
+		mtd->name = devm_kasprintf(docg3->dev, GFP_KERNEL, "docg3.%d",
+					   docg3->device_id);
 		if (!mtd->name)
 			return -ENOMEM;
 		docg3->max_block = 2047;
-- 
2.7.0