linux-kernel - Re: [PATCH v3] net-sysfs: Fix memory leak in netdev_register

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Date:   Thu, 21 Mar 2019 13:39:44 -0700 (PDT)
From:   David Miller <davem@...emloft.net>
To:     wanghai26@...wei.com
Cc:     idosch@...lanox.com, alexander.h.duyck@...el.com,
        tyhicks@...onical.com, f.fainelli@...il.com,
        amritha.nambiar@...el.com, joe@...ches.com,
        dmitry.torokhov@...il.com, andriy.shevchenko@...ux.intel.com,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3] net-sysfs: Fix memory leak in
 netdev_register_kobject

From: Wang Hai <wanghai26@...wei.com>
Date: Wed, 20 Mar 2019 14:25:05 -0400

> When registering struct net_device, it will call
> 	register_netdevice ->
> 		netdev_register_kobject ->
> 			device_initialize(dev);
> 			dev_set_name(dev, "%s", ndev->name)
> 			device_add(dev)
> 			register_queue_kobjects(ndev)
> 
> In netdev_register_kobject(), if device_add(dev) or
> register_queue_kobjects(ndev) failed. Register_netdevice()
> will return error, causing netdev_freemem(ndev) to be
> called to free net_device, however put_device(&dev->dev)->..->
> kobject_cleanup() won't be called, resulting in a memory leak.
> 
> syzkaller report this:
 ...
> Reported-by: Hulk Robot <hulkci@...wei.com>
> Fixes: 1fa5ae857bb1 ("driver core: get rid of struct device's bus_id string array")
> Signed-off-by: Wang Hai <wanghai26@...wei.com>

Applied and queued up for -stable.