netdev - Re: [PATCH] phy: fix phy_device

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Date:	Mon, 11 Feb 2013 13:57:45 -0500 (EST)
From:	David Miller <davem@...emloft.net>
To:	oss@...at.biz
Cc:	netdev@...r.kernel.org
Subject: Re: [PATCH] phy: fix phy_device_free memory leak

From: Petr Malat <oss@...at.biz>
Date: Mon, 11 Feb 2013 12:28:27 +0100

> From: Petr Malat <oss@...at.biz>
> 
> Fix memory leak in phy_device_free() for the case when phy_device*
> returned by phy_device_create() is not registered in the system.
> Signed-off-by: Petr Malat <oss@...at.biz>
> ---
> Bug description:
> phy_device_create() sets name of kobject using dev_set_name(), which 
> allocates memory using kvasprintf(), but this memory isn't freed if 
> the underlying device isn't registered properly, because kobject_cleanup()
> is not called in that case. This can happen (and actually is happening on 
> our machines) if phy_device_register(), called by mdiobus_scan(), fails. 
> 
> Patch description:
> Name is freed by phy_device_free(). In the case a device is released 
> trough kobject_cleanup()->device_release()->phy_device_release(), the name
> is set to NULL and it is not freed by phy_device_free(), because it will 
> be freed later by kobject_cleanup().

All of this descriptive information belongs in the commit message
proper.
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