Re: CVE-2022-49816: xen/pcpu: fix possible memory leak in register_pcpu()

Re: CVE-2022-49816: xen/pcpu: fix possible memory leak in register_pcpu()

[Jürgen Groß]

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On 01.05.25 16:10, Greg Kroah-Hartman wrote:
> From: Greg Kroah-Hartman <gregkh@kernel.org>
> 
> Description
> ===========
> 
> In the Linux kernel, the following vulnerability has been resolved:
> 
> xen/pcpu: fix possible memory leak in register_pcpu()
> 
> In device_add(), dev_set_name() is called to allocate name, if it returns
> error, the name need be freed. As comment of device_register() says, it
> should use put_device() to give up the reference in the error path. So fix
> this by calling put_device(), then the name can be freed in kobject_cleanup().
> 
> The Linux kernel CVE team has assigned CVE-2022-49816 to this issue.

Please revoke this CVE.

The issue can in no way be triggered by an unprivileged user.

The memory leak could happen only either during boot of dom0, or when
hotplugging a physical CPU to a Xen server.


Juergen

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Re: CVE-2022-49816: xen/pcpu: fix possible memory leak in register_pcpu()

[Greg KH]

On Thu, May 01, 2025 at 08:19:47PM +0200, Jürgen Groß wrote:
> On 01.05.25 16:10, Greg Kroah-Hartman wrote:
> > From: Greg Kroah-Hartman <gregkh@kernel.org>
> > 
> > Description
> > ===========
> > 
> > In the Linux kernel, the following vulnerability has been resolved:
> > 
> > xen/pcpu: fix possible memory leak in register_pcpu()
> > 
> > In device_add(), dev_set_name() is called to allocate name, if it returns
> > error, the name need be freed. As comment of device_register() says, it
> > should use put_device() to give up the reference in the error path. So fix
> > this by calling put_device(), then the name can be freed in kobject_cleanup().
> > 
> > The Linux kernel CVE team has assigned CVE-2022-49816 to this issue.
> 
> Please revoke this CVE.
> 
> The issue can in no way be triggered by an unprivileged user.
> 
> The memory leak could happen only either during boot of dom0, or when
> hotplugging a physical CPU to a Xen server.

Now rejected, thanks.

greg k-h