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

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Message-ID: <20190124160047.6091b3e3@bbrezillon>
Date:   Thu, 24 Jan 2019 16:00:47 +0100
From:   Boris Brezillon <bbrezillon@...nel.org>
To:     YueHaibing <yuehaibing@...wei.com>
Cc:     <robert.jarzmik@...e.fr>, <dwmw2@...radead.org>,
        <computersforpeace@...il.com>, <marek.vasut@...il.com>,
        <richard@....at>, <linux-kernel@...r.kernel.org>,
        <linux-mtd@...ts.infradead.org>
Subject: Re: [PATCH v3 -next] mtd: docg3: Fix a possible memory leak of
 mtd->name

On Wed, 23 Jan 2019 17:28:19 +0800
YueHaibing <yuehaibing@...wei.com> wrote:

> 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);

You forgot to remove the kfree() in the ->remove() path.

>  		if (!mtd->name)
>  			return -ENOMEM;
>  		docg3->max_block = 2047;