linux-kernel - Re: [PATCH] nvdimm: btt_devs: fix a NULL pointer dereference and a memory leak

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Date:   Fri, 22 Mar 2019 22:49:29 +0000
From:   "Verma, Vishal L" <vishal.l.verma@...el.com>
To:     "kjlu@....edu" <kjlu@....edu>
CC:     "Williams, Dan J" <dan.j.williams@...el.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "Jiang, Dave" <dave.jiang@...el.com>,
        "pakki001@....edu" <pakki001@....edu>,
        "linux-nvdimm@...ts.01.org" <linux-nvdimm@...ts.01.org>,
        "zwisler@...nel.org" <zwisler@...nel.org>
Subject: Re: [PATCH] nvdimm: btt_devs: fix a NULL pointer dereference and a
 memory leak

On Tue, 2019-03-12 at 03:15 -0500, Kangjie Lu wrote:
> In case kmemdup fails, the fix releases resources and returns to
> avoid the NULL pointer dereference.
> Also, the error paths in the following code should release
> resources to avoid memory leaks.
> 
> Signed-off-by: Kangjie Lu <kjlu@....edu>
> ---
>  drivers/nvdimm/btt_devs.c | 8 +++++++-
>  1 file changed, 7 insertions(+), 1 deletion(-)
> 

Looks good,
Reviewed-by: Vishal Verma <vishal.l.verma@...el.com>

> diff --git a/drivers/nvdimm/btt_devs.c b/drivers/nvdimm/btt_devs.c
> index 795ad4ff35ca..565ea0b6f765 100644
> --- a/drivers/nvdimm/btt_devs.c
> +++ b/drivers/nvdimm/btt_devs.c
> @@ -196,8 +196,13 @@ static struct device *__nd_btt_create(struct
> nd_region *nd_region,
>  	}
>  
>  	nd_btt->lbasize = lbasize;
> -	if (uuid)
> +	if (uuid) {
>  		uuid = kmemdup(uuid, 16, GFP_KERNEL);
> +		if (!uuid) {
> +			kfree(nd_btt);
> +			return NULL;
> +		}
> +	}
>  	nd_btt->uuid = uuid;
>  	dev = &nd_btt->dev;
>  	dev_set_name(dev, "btt%d.%d", nd_region->id, nd_btt->id);
> @@ -209,6 +214,7 @@ static struct device *__nd_btt_create(struct
> nd_region *nd_region,
>  		dev_dbg(&ndns->dev, "failed, already claimed by %s\n",
>  				dev_name(ndns->claim));
>  		put_device(dev);
> +		kfree(uuid);
>  		return NULL;
>  	}
>  	return dev;