linux-kernel - Re: [PATCH 2/2] net-sysfs: Fix memory leak in netdev_register

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Message-ID: <20190412083835.GG9224@smile.fi.intel.com>
Date:   Fri, 12 Apr 2019 11:38:35 +0300
From:   Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:     Wang Hai <wanghai26@...wei.com>
Cc:     davem@...emloft.net, idosch@...lanox.com, eric.dumazet@...il.com,
        alexander.h.duyck@...el.com, tyhicks@...onical.com,
        f.fainelli@...il.com, viro@...iv.linux.org.uk,
        amritha.nambiar@...el.com, joe@...ches.com,
        dmitry.torokhov@...il.com, stephen@...workplumber.org,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] net-sysfs: Fix memory leak in netdev_register_kobject

On Fri, Apr 12, 2019 at 04:36:34PM -0400, Wang Hai wrote:

> +error_register:
> +	device_del(dev);
> +error_device_add:
> +	kfree_const(dev->kobj.name);
>  	return error;

When put_device() will be called on this it will go to double free (in case of
dynamically allocated dev->kobj.name.

Al Viro and me suggested earlier that the correct fix is to call put_device()
in a places where it is appropriate.

-- 
With Best Regards,
Andy Shevchenko